Life In 19x19

Posted: **Thu Sep 16, 2021 12:07 pm**

Using the Commentary and the L&D-Examples, I will try to find out what the IMPLICIT Japanese understanding of the intended application of Article 7 of J89's legal text is (and what -- according to Western understanding -- should have been EXPLITELY described).

Commentary

7.1.U-type of stones

Click Here To Show Diagram Code: [go]$$ $$ +---------------------------------------- $$ |OB.B.BO..|....BO..|..B.BOO...|.WWW.BO..| $$ |OBBBBBO..|BBBBBO..|.BWBBBOO..|BBBBBBO..| $$ |OOOOOOO..|OOOOOO..|BWWWWBBO..|OOOOOOO..| $$ |.........|........|.BW.WBBO..|.........| $$ |.........|........|BBBW.WBO..|.........| $$ |.........|........|OBBWWWBO..|.........| $$ |.........|........|OOBBBBBO..|.........| $$ |.........|........|.OOOOOOO..|.........| $$ |.......MM|......MM|........MM|.......MM| $$ |.......Ma|......Mb|........Mc|.......Md| $$ +----------------------------------------[/go]

Alive stones =

A) Two solidly connected eyes.
B) Large eye that can be divided (=> A), even if the opponent plays first.
C) Not solidly connected eyes (at least two).
D) Filled large eye as a seki.

Implicit understanding:
Fencing stones (not marked here in the diagrams for the sake of clarity) are considered to be of the 7.1.U-type.

7.1.C-type of stones

Click Here To Show Diagram Code: [go]$$ $$ +------------------------ $$ |. # OO..|# # OO..|.........| $$ |OOXO..|O.XO..|..XXXXO..| $$ |XXX...|XXX...|.XOO.XO..| $$ |......|......|.XOO#O...| $$ |......|......|.XXXOO...| $$ |....MM|....MM|.......MM| $$ |....Ma|....Mb|.......Mc| $$ +------------------------[/go]

Alive stones =

A) B) C) Uttegaeshi's (aka "snap-back") potentially captured stones.

-------------------------

Click Here To Show Diagram Code: [go]$$W $$ +------------------------ $$ |1 # OO? ? |# # OO? ? |? ? ? ? ? ? ? ? ?| $$ |OOXO? ? |O1XO? ? |? ? XXXXO? ? | $$ |XXX? ? ?|XXX? ? ?|?XOO1XO? ? | $$ |? ? ? ? ? ? |? ? ? ? ? ? |?XOO#O? ? ?| $$ |? ? ? ? ? ? |? ? ? ? ? ? |?XXXOO? ? ?| $$ |? ? ? ? MM|? ? ? ? MM|? ? ? ? ? ? ?MM| $$ |? ? ? ? Ma|? ? ? ? Mb|? ? ? ? ? ? ?Mc| $$ +------------------------[/go]

Click Here To Show Diagram Code: [go]$$W $$ +------------------------ $$ |O 2 OO? ? |? 2 OO? ? |? ? ? ? ? ? ? ? ?| $$ |OOXO? ? |OOXO? ? |? ? XXXXO? ? | $$ |XXX? ? ?|XXX? ? ?|?XOOOXO? ? | $$ |? ? ? ? ? ? |? ? ? ? ? ? |?XOO2O? ? ?| $$ |? ? ? ? ? ? |? ? ? ? ? ? |?XXXOO? ? ?| $$ |? ? ? ? MM|? ? ? ? MM|? ? ? ? ? ? ?MM| $$ |? ? ? ? Ma|? ? ? ? Mb|? ? ? ? ? ? ?Mc| $$ +------------------------[/go]

Click Here To Show Diagram Code: [go]$$W $$ +------------------------ $$ |? B OO? ? |? # OO? ? |? ? ? ? ? ? ? ? ?| $$ |? ?XO? ? |OOXO? ? |? ? XXXXO? ? | $$ |XXX? ? ?|XXX? ? ?|?X? ? ?XO? ? | $$ |? ? ? ? ? ? |? ? ? ? ? ? |?X? ?BO? ? ?| $$ |? ? ? ? ? ? |? ? ? ? ? ? |?XXXOO? ? ?| $$ |? ? ? ? MM|? ? ? ? MM|? ? ? ? ? ? ?MM| $$ |? ? ? ? Ma|? ? ? ? Ma|? ? ? ? ? ? ?Mc| $$ +------------------------[/go]

NOT SHOWN: Move sequences.

Implicit understanding:
Presupposed basic knowledge?

Implicit understanding:
Stones that could be re-established in total because they were previously captured, are of the 7.1.C-type.
Total re-establishment will result in territory.

-------------------------

Click Here To Show Diagram Code: [go]$$ $$ +------------------- $$ |? # # ? O ? X ? ? | $$ |O O O O O ? X ? ? | $$ |X X X X X X X ? ? | $$ |? ? ? ? ? ? ? ? ? | $$ |? ? ? ? ? ? ? ? ? | $$ +-------------------[/go]

NOT EXPLICITLY mentioned: Nakade.

Implicit understanding:
Presupposed basic knowledge?

Implicit understanding:
Stones that could be re-established in total because they were previously captured, are of the 7.1.C-type.
Total re-establishment will result in territory.

7.1.D-type of stones

Click Here To Show Diagram Code: [go]$$ $$ +------------------------ $$ |.XOO..|XXOO..|.........| $$ |PPXO..|P.XO..|..XXXXO..| $$ |XXX...|XXX...|.XPP.XO..| $$ |......|......|.XPPXO...| $$ |......|......|.XXXOO...| $$ |....MM|....MM|.......MM| $$ |....Ma|....Mb|.......Mc| $$ +------------------------[/go]

Dead stones =

A) B) C) Uttegaeshi's (aka "snap-back") potentially capturing stones.

Click Here To Show Diagram Code: [go]$$ $$ +------------------------------- $$ |.OO.ZO..|..Z.Z.ZO..|..........| $$ |ZOOZZO..|.OOZZZZO..|..OOO.....| $$ |ZZZZOO..|...OOOOO..|.OZZO.....| $$ |OOOO....|..........|.OZ.ZOO...| $$ |........|..........|.OZZ.Z.O..| $$ |........|..........|.O.OZZ.O..| $$ |........|..........|...O..O...| $$ |........|..........|....O.....| $$ |......MM|........MM|........MM| $$ |......Md|........Me|........Mf| $$ +-------------------------------[/go]

Dead stones =

D) Large eye with nakade.
E) One solidly connected eye & one false eye.
F) One not solidly connected eye & one false eye / two false eyes / one solidly connected eye.

-------------------------

NOT SHOWN: Move sequences.

Implicit understanding:
Presupposed basic knowledge?

Posted: **Fri Sep 17, 2021 1:09 am**

L&D Example 1

Click Here To Show Diagram Code: [go]$$ $$ +-------------- $$ | . # # O . . | $$ | @ # # O . . | $$ | X O O O . . | $$ | X X X . . . | $$ | . . . . . . | $$ | . . . . . . | $$ +--------------[/go]

J89's judgement of L&D:

Black's four stones are of the 7.1.C-type.

White's single stone is of the 7.1.C-type.

Why

?

Click Here To Show Diagram Code: [go]$$W $$ +-------------------------------------------------------- $$ | 1 X X O . . | O M M O . . | O . . O . . | O . . O . . | $$ | O X X O . . | O M M O . . | O 2 . O . . | O B . O . . | $$ | X O O O . . | X O O O . . | X O O O . . | X O O O . . | $$ | X X X . . . | X X X . . . | X X X . . . | X X X . . . | $$ | . . . . . . | . . . . . . | . . . . . . | . . . . . . | $$ | . . . . . . | . . . . . . | . . . . . . | . . . . . . | $$ +--------------------------------------------------------[/go]

---------------------

Click Here To Show Diagram Code: [go]$$W :b6: pass $$ +------------------------------------------ $$ | O 3 4 O ? ? | ? 7 X O ? ? | ? O ? O ? ? | $$ | O X ? O ? ? | 8 X 5 O ? ? | X B O O ? ? | $$ | X O O O ? ? | X O O O ? ? | X O O O ? ? | $$ | X X X ? ? ? | X X X ? ? ? | X X X ? ? ? | $$ | ? ? ? ? ? ? | ? ? ? ? ? ? | ? ? ? ? ? ? | $$ | ? ? ? ? ? ? | ? ? ? ? ? ? | ? ? ? ? ? ? | $$ +------------------------------------------[/go]

NOT SHOWN: Further sequence.

Implicit understanding:
Presupposed basic knowledge?
Considered redundant?

Implicit understanding:
Stones that could be re-established partially because they were previously captured, are of the 7.1.C-type.
Partial re-establishment will result in seki.

Why

?

Click Here To Show Diagram Code: [go]$$B $$ +--------------------------------------------------------------------- $$ | 1 X X O . . | X X X O . . | X X X O . . | 5 4 6 O . . | X W W O . . | $$ | O X X O . . | M X X O . . | 2 X X O . . | O 3 . O . . | . X . O . . | $$ | X O O O . . | X O O O . . | X O O O . . | X O O O . . | X O O O . . | $$ | X X X . . . | X X X . . . | X X X . . . | X X X . . . | X X X . . . | $$ | . . . . . . | . . . . . . | . . . . . . | . . . . . . | . . . . . . | $$ | . . . . . . | . . . . . . | . . . . . . | . . . . . . | . . . . . . | $$ +----------------------------------------------------------------------[/go]

Implicit understanding:
Because White's single stone in the corner was previously captured, White could create permament stones of her "out-of-body", i.e. on board points that were NOT previously occupied by captured stones of her. Thus, her captured stone is of the 7.1.C-type.
Out-of-body creation of 7.1.U-type stones will result in seki.

---------------------

Click Here To Show Diagram Code: [go]$$B $$ +-------------- $$ | X O O O ? ? | $$ | 7 X ? O ? ? | $$ | X O O O ? ? | $$ | X X X ? ? ? | $$ | ? ? ? ? ? ? | $$ | ? ? ? ? ? ? | $$ +--------------[/go]

NOT SHOWN: Further sequence.

Implicit understanding:
Considered redundant?

Posted: **Fri Sep 17, 2021 3:35 am**

L&D Example 2

Click Here To Show Diagram Code: [go]$$ $$ +------------------ $$ | . # W . W X . . | $$ | # . W . W X . . | $$ | W W W W X X . . | $$ | X X X X . . . . | $$ | . . . . . . . . | $$ | . . . . . . . . | $$ +------------------[/go]

J89's judgement of L&D:

Black's two stones are of the 7.1.C-type.

White's eight stones are of the 7.1.U-type.

Why

?

Click Here To Show Diagram Code: [go]$$W $$ +------------------------------------------------------ $$ | 3 X O . O X . . | O M O 4 O X . . | O . O B . X . . | $$ | X 1 O 2 O X . . | M O O X O X . . | . O O X . X . . | $$ | O O O O X X . . | O O O O X X . . | O O O O X X . . | $$ | X X X X . . . . | X X X X . . . . | X X X X . . . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ +------------------------------------------------------[/go]

Implicit understanding:
Because Black's stones in the corner were previously captured (with

), Black could create (with

) a permament stone of his "out-of-body", i.e. on a board point that was NOT previously occupied by captured stones of his. Thus, his captured stones are of the 7.1.C-type.
The "out-of-body area" can be separated by 7.1.U-type stones from the "capture area".
Out-of-body creation of 7.1.U-type stones will result in seki.

---------------------

Misleading!
J89's comment on L&D Example 2 ALSO describes

as a "newly created stone that cannot be captured".
But

has NOT been played AFTER White captured his stones in the corner.

So this should be an UNADAPTED RELIC of the initial version ("if capturing ... enables ..."; i.e. "if THE PROCESS of capturing ... enables ...").

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Posted: **Fri Sep 17, 2021 4:08 am**

L&D Example 4

Click Here To Show Diagram Code: [go]$$B $$ +-----------------------+ $$ | . B . . B B B @ X . . | $$ | B B @ @ @ @ @ @ X . . | $$ | . @ X X X X X X X . . | $$ | . @ X . . . . . . . . | $$ | B @ X . . . . . . . . | $$ | B @ X . . . . . . . . | $$ | B @ X . . . . . . . . | $$ | @ @ X . . . . . . . . | $$ | X X X . . . . . . . . | $$ | . . . . . . . . . . . | $$ | . . . . . . . . . . . | $$ +-----------------------+[/go]

J89's judgement of L&D:

White's stones are of the 7.1.C-type.

Black's stones are of the 7.1.U-type.

Why

?

Click Here To Show Diagram Code: [go]$$B $$ +-----------------------------------------------------------------------+ $$ | . X 1 2 X X X O X . . | . X X O . 3 . O X . . | . X X O 7 X 5 O X . . | $$ | X X O O O O O O X . . | X X O O O O O O X . . | X X O O O O O O X . . | $$ | . O X X X X X X X . . | . O X X X X X X X . . | . O X X X X X X X . . | $$ | . O X . . . . . . . . | 4 O X . . . . . . . . | O O X . . . . . . . . | $$ | X O X . . . . . . . . | X O X . . . . . . . . | . O X . . . . . . . . | $$ | X O X . . . . . . . . | X O X . . . . . . . . | 6 O X . . . . . . . . | $$ | X O X . . . . . . . . | X O X . . . . . . . . | . O X . . . . . . . . | $$ | O O X . . . . . . . . | O O X . . . . . . . . | O O X . . . . . . . . | $$ | X X X . . . . . . . . | X X X . . . . . . . . | X X X . . . . . . . . | $$ | . . . . . . . . . . . | . . . . . . . . . . . | . . . . . . . . . . . | $$ | . . . . . . . . . . . | . . . . . . . . . . . | . . . . . . . . . . . | $$ +-----------------------------------------------------------------------+[/go]

---------------------

Misleading!

Click Here To Show Diagram Code: [go]$$B $$ +-----------------------------------------------------------------------+ $$ | ? X X M X X X M X ? ? | ? X X M X X X M X ? ? | ? X X ? X X X ? X ? ? | $$ | X X M M M M M M X ? ? | X X M M M M M M X ? ? | X X ? ? ? ? ? ? X ? ? | $$ | ? O X X X X X X X ? ? | 8 O X X X X X X X ? ? | W O X X X X X X X ? ? | $$ | O O X ? ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? ? | $$ | ? O X ? ? ? ? ? ? ? ? | ? O X ? ? ? ? ? ? ? ? | ? O X ? ? ? ? ? ? ? ? | $$ | O O X ? ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? ? | $$ | ? O X ? ? ? ? ? ? ? ? | ? O X ? ? ? ? ? ? ? ? | ? O X ? ? ? ? ? ? ? ? | $$ | O O X ? ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? ? | $$ | X X X ? ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | $$ +-----------------------------------------------------------------------+[/go]

J89's sequence on L&D Example 4 ends with the position at left.
But NO White stone has been played AFTER Black captured her stones at the top.

So this should be an UNADAPTED RELIC of the initial version ("if capturing ... enables ..."; i.e. "if THE PROCESS of capturing ... enables ...").[/color]

must be added as an out-of-body stone that cannot be captured!

Implicit understanding:
Because White's stones at the top were previously captured (with

), White could create (with

) a permament stone of her "out-of-body", i.e. on a board point that was NOT previously occupied by captured stones of her. Thus, her captured stones are of the 7.1.C-type.
The "out-of-body area" can be separated by 7.1.U-type stones from the "capture area".
Out-of-body creation of 7.1.U-type stones will result in seki.

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Posted: **Fri Sep 17, 2021 6:29 am**

L&D Example 5

Click Here To Show Diagram Code: [go]$$B $$ +-------------------+ $$ | . @ B B . @ X . . | $$ | # # O B . @ X . . | $$ | # # O B B @ X . . | $$ | O O O O O X X . . | $$ | . . . . . . . . . | $$ | . . . . . . . . . | $$ +-------------------+[/go]

J89's judgement of L&D:

White's stones are of the 7.1.C-type.

Black's stones at the left are of the 7.1.C-type.

Black's stones at the top are of the 7.1.U-type.

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

in the corner already judged of being of 7.1.C-type in L&D Example 1?
Judging

at the top left as an application case for the reader?

---------------------

Click Here To Show Diagram Code: [go]$$B $$ +-------------------------------------------------------–-------------–-------------------------------------------------+ $$ | 1 O X X ? O X ? ? | X 2 X X ? O X ? ? | 5 O X X ? O X ? ? | X ? X X 7 O X ? ? | X 0 X X X M X ? ? | ? W X X X ? X ? ? | $$ | X X O X ? O X ? ? | X X O X ? O X ? ? | 4 3 O X ? O X ? ? | O X O X 9 O X ? ? | O X O X X M X ? ? | O ? O X X ? X ? ? | $$ | X X O X X O X ? ? | X X O X X O X ? ? | ? ? O X X O X ? ? | 6 8 O X X O X ? ? | O O O X X M X ? ? | O O O X X ? X ? ? | $$ | O O O O O X X ? ? | O O O O O X X ? ? | O O O O O X X ? ? | O O O O O X X ? ? | O O O O O X X ? ? | O O O O O X X ? ? | $$ | ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? | $$ +--------------------------–--------------------------------------------------------------------------------------------+[/go]

Implicit understanding:
Because White's stones at the top were previously captured (with

), White could create (with

) a permament stone of her "out-of-body", i.e. on a board point that was NOT previously occupied by these captured stones of her. Thus, her captured stones at the top are of the 7.1.C-type.
The "out-of-body area" can be separated by 7.1.U-type stones from the "capture area".
Out-of-body creation of 7.1.U-type stones will result in seki.

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

already judged of being of 7.1.C-type in L&D Example 1?

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Posted: **Fri Sep 17, 2021 10:24 am**

Summary 7.1.C-type stones

Subtype "Complete re-establishment"

Stones that could be re-established in total because they were previously captured.
Total re-establishment will result in territory.

Uttegaeshi => Commentary
Nakade => NOT explicitly mentioned

Subtype "Partial re-establishment"

Stones that could be re-established partially because they were previously captured.
Partial re-establishment will result in seki.

=> L&D Example 1
=> L&D Example 5

Subtype "Out-of-body re-establishment"

Because stones were previously captured, permament stones of that colour could be created "out-of-body", i.e. on board points that were NOT previously occupied by the captured stones.
Out-of-body creation of permanent stones will result in seki.

=> L&D Example 1
=> L&D Example 2
=> L&D Example 4
=> L&D Example 5

The "out-of-body area" can be separated by 7.1.U-type stones from the "capture area". => Re-establishment is considered a GLOBAL issue.

=> L&D Example 2
=> L&D Example 4
=> L&D Example 5

Cause and effect relationship

Click Here To Show Diagram Code: [go]$$W $$ +-------------------------------------------------------- $$ | 1 X X O . . | O M M O . . | O . . O . . | O . . O . . | $$ | O X X O . . | O M M O . . | O 2 . O . . | O B . O . . | $$ | X O O O . . | X O O O . . | X O O O . . | X O O O . . | $$ | X X X . . . | X X X . . . | X X X . . . | X X X . . . | $$ | . . . . . . | . . . . . . | . . . . . . | . . . . . . | $$ | . . . . . . | . . . . . . | . . . . . . | . . . . . . | $$ +--------------------------------------------------------[/go]

Capture of stones and re-establishment of stones have to be in a cause-and-effect relationship.

Cause =

= capture
Effect =

= re-establishment

------------------------

Click Here To Show Diagram Code: [go]$$B $$ +---------------- $$ | 1 ? X X X ? ? | $$ | X X ? ? X ? ? | $$ | O X X X X ? ? | $$ | O O O O ? ? ? | $$ | ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? | $$ +----------------[/go]

is not an effect of any previous capture of Black stones elsewhere on the board.

Click Here To Show Diagram Code: [go]$$B :w2: elsewhere $$ +------------------------------------ $$ | 1 O X X X X ? ? | X 3 X X X X ? ? | $$ | X X ? X ? X ? ? | X X ? X ? X ? ? | $$ | O X X X X X ? ? | O X X X X X ? ? | $$ | O O O O O ? ? ? | O O O O O ? ? ? | $$ | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | $$ +------------------------------------[/go]

Neither

nor

is an effect of any previous capture of Black stones elsewhere on the board.

Click Here To Show Diagram Code: [go]$$W :w3: elsewhere $$ +-------------------------------- $$ | 1 O 2 O X ? ? | ? ? X ? X ? ? | $$ | O O O O X ? ? | ? ? 4 ? X ? ? | $$ | X X X X X ? ? | X X X X X ? ? | $$ | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | $$ +--------------------------------[/go]

Neither

nor

is an effect of any previous capture of Black stones elsewhere on the board.

Posted: **Sat Sep 18, 2021 1:58 am**

Commentary

7.2.D-type of ko

Click Here To Show Diagram Code: [go]$$ $$ +---------------- $$ | Z P a Z O . . | $$ | . Z Z Z O . . | $$ | Z Z O O O . . | $$ | O O O . . . . | $$ | . . . . . . . | $$ | . . . . . . . | $$ +----------------[/go]

J89's judgement of L&D:

White's single stone is of the 7.1.D-type.

Black's stones in the corner are of the 7.1.D-type.

Black should have played teire at A before the game stopped.

Why

?

Click Here To Show Diagram Code: [go]$$B $$ +-------------------------------- $$ | X O 1 X O . . | X M X X O . . | $$ | . X X X O . . | . X X X O . . | $$ | X X O O O . . | X X O O O . . | $$ | O O O . . . . | O O O . . . . | $$ | . . . . . . . | . . . . . . . | $$ | . . . . . . . | . . . . . . . | $$ +--------------------------------[/go]

Why

?

Click Here To Show Diagram Code: [go]$$W :b2: pass $$ +------------------------------------------------ $$ | X O . X O . . | . O 3 X O . . | . O O . O . . | $$ | 1 X X X O . . | O X X X O . . | O . . . O . . | $$ | X X O O O . . | X X O O O . . | . . O O O . . | $$ | O O O . . . . | O O O . . . . | O O O . . . . | $$ | . . . . . . . | . . . . . . . | . . . . . . . | $$ | . . . . . . . | . . . . . . . | . . . . . . . | $$ +------------------------------------------------[/go]

Implicit understanding:
There are NO ko-threats during L&D status confirmation.
Capturing into a single ko-shape allows playing two moves in a row locally.

7.2.Y-type of ko

Click Here To Show Diagram Code: [go]$$ $$ +------------------ $$ | # P a . B O . . | $$ | . B B B B O . . | $$ | B B O O O O . . | $$ | O O O . . . . . | $$ | . . . . . . . . | $$ | . . . . . . . . | $$ +------------------[/go]

J89's judgement of L&D:

White's single stone is of the 7.1.D-type.

Black's single stone in the corner is of the 7.1.C-type.

Black's seven stones are of the 7.1.U-type.

There is no need for Black to play teire at A before the game stopped.

Why

?

Click Here To Show Diagram Code: [go]$$B $$ +------------------------------------ $$ | X O 1 . X O . . | X M X . X O . . | $$ | . X X X X O . . | . X X X X O . . | $$ | X X O O O O . . | X X O O O O . . | $$ | O O O . . . . . | O O O . . . . . | $$ | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | $$ +------------------------------------[/go]

Why

/

?

Click Here To Show Diagram Code: [go]$$W :b2: pass; :w5: pass $$ +------------------------------------------------------------------------ $$ | X O . . X O . . | . O 3 . X O . . | 4 O O 6 X O . . | B . . B B O . . | $$ | 1 X X X X O . . | O X X X X O . . | O X X X X O . . | . B B B B O . . | $$ | X X O O O O . . | X X O O O O . . | X X O O O O . . | B B O O O O . . | $$ | O O O . . . . . | O O O . . . . . | O O O . . . . . | O O O . . . . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ +------------------------------------------------------------------------[/go]

Implicit understanding:
There are NO ko-threats during L&D status confirmation.
Capturing into a single ko-shape allows playing two moves in a row locally.

-------------------------------

Click Here To Show Diagram Code: [go]$$W $$ +------------------------------------ $$ | X O 1 2 X O ? ? | X ? ? X X O ? ? | $$ | ? X X X X O ? ? | ? X X X X O ? ? | $$ | X X O O O O ? ? | X X O O O O ? ? | $$ | O O O ? ? ? ? ? | O O O ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | $$ +------------------------------------[/go]

Please note that the result would have been the same if White had NOT captured into the ko-shape in the corner.

Implicit understanding:
There are NO ko-fights during L&D status confirmation.

7.2.Y+R-type of ko

Click Here To Show Diagram Code: [go]$$ $$ +------------------ $$ | # P a . B O . . | $$ | . B B B B O . . | $$ | B B O O O O . . | $$ | O O O . . . . . | $$ | . . . . . . . . | $$ | . . . . . . . . | $$ | . . . . . . . . | $$ | . . . . . . . . | $$ | X X X X X . . . | $$ | O O O O X . . . | $$ | X O . O X X . . | $$ | . X O O O X . . | $$ | X X X O O X . . | $$ | . X O . O X . . | $$ +------------------[/go]

J89's judgement of L&D:

White's single stone in the upper corner is of the 7.1.D-type.

Black's single stone in the upper corner is of the 7.1.C-type.

Black's seven stones in the upper corner are of the 7.1.U-type.
The lower corner is and remains a double-ko seki.

There is no need for Black to play teire at A before the game stopped.

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?
Already shown with 7.2.Y-type of ko?

Why

/

?

Click Here To Show Diagram Code: [go]$$W :b2: pass [color=#FF0000]upper corner[/color]; :w7: pass upper corner $$ +------------------------------------------------------------------------ $$ | X O . . X O . . | . O 3 . X O . . | 4 O O 8 X O . . | B . . B B O . . | $$ | 1 X X X X O . . | O X X X X O . . | O X X X X O . . | . B B B B O . . | $$ | X X O O O O . . | X X O O O O . . | X X O O O O . . | B B O O O O . . | $$ | O O O . . . . . | O O O . . . . . | O O O . . . . . | O O O . . . . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ | X X X X X . . . | X X X X X . . . | X X X X X . . . | X X X X X . . . | $$ | O O O O X . . . | O O O O X . . . | O O O O X . . . | O O O O X . . . | $$ | X O . O X X . . | X O . O X X . . | X O . O X X . . | . O . O X X . . | $$ | . X O O O X . . | . X O O O X . . | 5 X O O O X . . | O X O O O X . . | $$ | X X X O O X . . | X X X O O X . . | X X X O O X . . | X X X O O X . . | $$ | . X O . O X . . | . X O . O X . . | . X O 6 O X . . | . X . X O X . . | $$ +------------------------------------------------------------------------[/go]

Implicit understanding:
There are NO ko-threats during L&D status confirmation.
Capturing into a single ko-shape allows playing two moves in a row locally.
There are NO UNREMOVABLE ko-threats during L&D status confirmation.

Misleading!
The specification of the corner is NOT required for

because there is only ONE ko-shape to be re-captured into.

Click Here To Show Diagram Code: [go]$$Wm9 :w9: pass [color=#FF0000]lower corner[/color]; :b10: pass [color=#FF0000]lower corner[/color] $$ +------------------------------------ $$ | B . . B B O . . | B . . B B O . . | $$ | . B B B B O . . | . B B B B O . . | $$ | B B O O O O . . | B B O O O O . . | $$ | O O O . . . . . | O O O . . . . . | $$ | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | $$ | X X X X X . . . | X X X X X . . . | $$ | O O O O X . . . | O O O O X . . . | $$ | 4 O . O X X . . | X O . O X X . . | $$ | O X O O O X . . | . X O O O X . . | $$ | X X X O O X . . | X X X O O X . . | $$ | . X 3 X O X . . | . X O . O X . . | $$ +------------------------------------[/go]

The L&D-status of Black's stones in the upper corner has already been decided by

.
Nevertheless, the second half of the double-ko cycle in the lower corner is shown explicitly.

Implicit understanding:
There is NO double-ko during L&D status confirmation.

Misleading!
The specification of the corner is NEITHER required for

NOR for

because there is only ONE ko-shape each to be re-captured into.

-------------------------------

Click Here To Show Diagram Code: [go]$$W $$ +------------------------------------ $$ | X O 1 2 X O ? ? | B ? ? B B O ? ? | $$ | ? X X X X O ? ? | ? B B B B O ? ? | $$ | X X O O O O ? ? | B B O O O O ? ? | $$ | O O O ? ? ? ? ? | O O O ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | $$ | X X X X X ? ? ? | X X X X X ? ? ? | $$ | O O O O X ? ? ? | O O O O X ? ? ? | $$ | X O ? O X X ? ? | X O ? O X X ? ? | $$ | ? X O O O X ? ? | ? X O O O X ? ? | $$ | X X X O O X ? ? | X X X O O X ? ? | $$ | ? X O ? O X ? ? | ? X O ? O X ? ? | $$ +------------------------------------[/go]

Please note that the result would have been the same if White had NOT captured into the ko-shape in the upper corner.

Implicit understanding:
There are NO ko-fights during L&D status confirmation.

Posted: **Sat Sep 18, 2021 3:59 am**

L&D Example 7-1

Click Here To Show Diagram Code: [go]$$ $$ +------------------ $$ | B B B . P X . . | $$ | . P P P P X . . | $$ | P P X X X X . . | $$ | X X X . . . . . | $$ | . . . . . . . . | $$ | . . . . . . . . | $$ +------------------[/go]

J89's judgement of L&D:

Black's three stones in the corner are of of the 7.1.U-type.

White's stones in the corner are of the 7.1.D-type.

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Why

?

Click Here To Show Diagram Code: [go]$$B :w6: pass $$ +------------------------------------------------------------------------ $$ | X X X 2 O X . . | 4 3 . O O X . . | O X 7 O O X . . | . X X M M X . . | $$ | 1 O O O O X . . | . O O O O X . . | 5 O O O O X . . | X M M M M X . . | $$ | O O X X X X . . | O O X X X X . . | O O X X X X . . | M M X X X X . . | $$ | X X X . . . . . | X X X . . . . . | X X X . . . . . | X X X . . . . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ +------------------------------------------------------------------------[/go]

Implicit understanding:
There are NO ko-threats during L&D status confirmation.
Capturing into a single ko-shape allows playing two moves in a row locally.

-------------------------------

Click Here To Show Diagram Code: [go]$$Bm5 :w4: pass; :w6: pass; :w10: pass; :w12: pass $$ +------------------------------------------------------------------------ $$ | ? X ? O O X ? ? | 1 X 4 O O X ? ? | 5 7 O O O X ? ? | X X M M M X ? ? | $$ | ? O O O O X ? ? | 3 O O O O X ? ? | 9 O O O O X ? ? | X M M M M X ? ? | $$ | O O X X X X ? ? | O O X X X X ? ? | O O X X X X ? ? | M M X X X X ? ? | $$ | X X X ? ? ? ? ? | X X X ? ? ? ? ? | X X X ? ? ? ? ? | X X X ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | $$ +------------------------------------------------------------------------[/go]

Please note that the result would have been the same if White had NOT created the ko-shape in the corner.

Implicit understanding:
There are NO ko-fights during L&D status confirmation.

Posted: **Sat Sep 18, 2021 6:40 am**

L&D Example 7-2

Click Here To Show Diagram Code: [go]$$ $$ +------------------ $$ | B B B . P X . . | $$ | . P P P P X . . | $$ | P P X X X X . . | $$ | X X X . . . . . | $$ | . . . . . . . . | $$ | . . . . . . . . | $$ | . . . . . . . . | $$ | . . . . . . . . | $$ | O O O O O O . . | $$ | X X X X X O . . | $$ | X O O . X O . . | $$ | O . O . X O . . | $$ +------------------[/go]

J89's judgement of L&D:

Black's three stones in the corner are of of the 7.1.U-type.

White's stones in the corner are of the 7.1.D-type.

NO judgement on the L&D status of the lower corner.

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Why

?

Click Here To Show Diagram Code: [go]$$B :w8: pass [color=#FF0000]("upper corner" missing!)[/color] $$ +------------------------------------------------------------------------ $$ | X X X 2 O X . . | 4 3 . O O X . . | O X 9 O O X . . | . X X M M X . . | $$ | 1 O O O O X . . | . O O O O X . . | 5 O O O O X . . | X M M M M X . . | $$ | O O X X X X . . | O O X X X X . . | O O X X X X . . | M M X X X X . . | $$ | X X X . . . . . | X X X . . . . . | X X X . . . . . | X X X . . . . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ | O O O O O O . . | O O O O O O . . | O O O O O O . . | O O O O O O . . | $$ | X X X X X O . . | X X X X X O . . | X X X X X O . . | X X X X X O . . | $$ | X O O . X O . . | X O O . X O . . | X O O 6 X O . . | X O O O X O . . | $$ | O . O . X O . . | O . O . X O . . | O 7 O . X O . . | . X O . X O . . | $$ +------------------------------------------------------------------------[/go]

Implicit understanding:
There are NO UNERASABLE ko-threats during L&D status confirmation.
Capturing into a single ko-shape allows playing two moves in a row locally.

Misleading!
The specification of the corner IS REQUIRED for

(but missing) because there are TWO ko-shapes to be re-captured into.

Click Here To Show Diagram Code: [go]$$Bm11 :w10: pass $$ +------------------------------------ $$ | . X X M M X . . | . X X M M X . . | $$ | X M M M M X . . | X M M M M X . . | $$ | M M X X X X . . | M M X X X X . . | $$ | X X X . . . . . | X X X . . . . . | $$ | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | $$ | O O O O O O . . | O O O O O O . . | $$ | X X X X X O . . | X X X X X O . . | $$ | X O O O X O . . | X . . . X O . . | $$ | . X O 1 X O . . | . X . X X O . . | $$ +------------------------------------[/go]

The L&D-status of White's stones in the upper corner has already been decided by

.
Nevertheless, the capture of White's stones in the lower corner is shown explicitly.

Implicit understanding:
An UNERASABLE ko-threat is NOT a means of creating stones of the 7.1.C-type.

Posted: **Sat Sep 18, 2021 1:44 pm**

L&D Example 8

Click Here To Show Diagram Code: [go]$$ $$ +---------------- $$ | . . . . . . . | $$ | O O . . . . . | $$ | Z O . . . . . | $$ | . Z O O O . . | $$ | Z Z Z Z O . . | $$ | @ Z . Z O . . | $$ | . W Z W X . . | $$ | W W W W X . . | $$ | . W X X X . . | $$ | W W X . . . . | $$ | X X X . . . . | $$ | . . . . . . . | $$ | . . . . . . . | $$ +----------------[/go]

J89's judgement of L&D:

White's nine stones are of of the 7.1.U-type.

White's single stone is of the 7.1.C-type.

Black's stones are of the 7.1.D-type.

Why

?

Click Here To Show Diagram Code: [go]$$W :b4: pass $$ +---------------------------------------------------------------- $$ | . . . . . . . | . . . . . . . | . . . . . . . | . . . . . . . | $$ | O O . . . . . | O O . . . . . | O O . . . . . | O O . . . . . | $$ | X O . . . . . | . O . . . . . | . O . . . . . | M O . . . . . | $$ | 1 X O O O . . | O X O O O . . | O X O O O . . | O M O O O . . | $$ | X X X X O . . | X X X X O . . | X X X X O . . | M M M M O . . | $$ | O X 3 X O . . | . X O X O . . | 5 X O X O . . | O M O M O . . | $$ | 2 O X O X . . | X O . O X . . | X O . O X . . | . O M O X . . | $$ | O O O O X . . | O O O O X . . | O O O O X . . | O O O O X . . | $$ | . O X X X . . | . O X X X . . | . O X X X . . | . O X X X . . | $$ | O O X . . . . | O O X . . . . | O O X . . . . | O O X . . . . | $$ | X X X . . . . | X X X . . . . | X X X . . . . | X X X . . . . | $$ | . . . . . . . | . . . . . . . | . . . . . . . | . . . . . . . | $$ | . . . . . . . | . . . . . . . | . . . . . . . | . . . . . . . | $$ +----------------------------------------------------------------[/go]

Implicit understanding:
There are NO ko-threats during L&D status confirmation.
Capturing into a single ko-shape allows playing two moves in a row locally.
There is NO double-ko during L&D status confirmation.

Misleading!
The specification of the ko-shape IS REQUIRED for

(but missing, probably because it does not matter here) because there are TWO ko-shapes to be re-captured into.

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Click Here To Show Diagram Code: [go]$$B :b3: pass; :b5: pass $$ +------------------------------------------------------------------------------------------------ $$ | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | $$ | O O ? ? ? ? ? | O O ? ? ? ? ? | O O ? ? ? ? ? | O O ? ? ? ? ? | O O ? ? ? ? ? | O O ? ? ? ? ? | $$ | X O ? ? ? ? ? | X O ? ? ? ? ? | X O ? ? ? ? ? | T O ? ? ? ? ? | T O ? ? ? ? ? | ? O ? ? ? ? ? | $$ | ? X O O O ? ? | ? X O O O ? ? | 4 X O O O ? ? | O X O O O ? ? | O X O O O ? ? | O ? O O O ? ? | $$ | X X X X O ? ? | X X X X O ? ? | X X X X O ? ? | X X X X O ? ? | X X X X O ? ? | ? ? ? ? O ? ? | $$ | O X 2 X O ? ? | M X O X O ? ? | M X O X O ? ? | M X O X O ? ? | 6 X O X O ? ? | W ? O ? O ? ? | $$ | 1 O X O X ? ? | X O T O X ? ? | X O T O X ? ? | X O T O X ? ? | X O T O X ? ? | ? O ? O X ? ? | $$ | O O O O X ? ? | O O O O X ? ? | O O O O X ? ? | O O O O X ? ? | O O O O X ? ? | O O O O X ? ? | $$ | ? O X X X ? ? | ? O X X X ? ? | ? O X X X ? ? | ? O X X X ? ? | ? O X X X ? ? | ? O X X X ? ? | $$ | O O X ? ? ? ? | O O X ? ? ? ? | O O X ? ? ? ? | O O X ? ? ? ? | O O X ? ? ? ? | O O X ? ? ? ? | $$ | X X X ? ? ? ? | X X X ? ? ? ? | X X X ? ? ? ? | X X X ? ? ? ? | X X X ? ? ? ? | X X X ? ? ? ? | $$ | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | ? ? ? ? ? ? ? | $$ +------------------------------------------------------------------------------------------------[/go]

Implicit understanding:
There is NO double-ko during L&D status confirmation.
There are NO ko-threats during L&D status confirmation.
Capturing into a single ko-shape allows playing two moves in a row locally.

=============================================
=============================================

MISTAKE in J89's INITIAL version???

Click Here To Show Diagram Code: [go]$$ $$ +---------------- $$ | , , , , , , , | $$ | O O , , , , , | $$ | Z O , , , , , | $$ | , Z O O O , , | $$ | Z Z Z Z O , , | $$ | @ Z , Z O , , | $$ | , W Z W X , , | $$ | W W W W X , , | $$ | , W X X X , , | $$ | W W X , , , , | $$ | X X X , , , , | $$ | , , , , , , , | $$ | , , , , , , , | $$ +----------------[/go]

This diagram shows the CORRECT judgement when applying J89's initial version of the L&D status confirmation.

Why

?

First attempt.

Click Here To Show Diagram Code: [go]$$B :b3: pass; :w4: pass; :b7: pass; :w8: pass $$ +---------------------------------------------------------------- $$ | , , , , , , , | , , , , , , , | , , , , , , , | , , , , , , , | $$ | O O , , , , , | O O , , , , , | O O , , , , , | O O , , , , , | $$ | X O , , , , , | X O , , , , , | X O , , , , , | X O , , , , , | $$ | , X O O O , , | , X O O O , , | , X O O O , , | , X O O O , , | $$ | X X X X O , , | X X X X O , , | X X X X O , , | X X X X O , , | $$ | O X 2 X O , , | , X O X O , , | 6 X O X O , , | O X , X O , , | $$ | 1 O X O X , , | X O , O X , , | X O 5 O X , , | , O X O X , , | $$ | O O O O X , , | O O O O X , , | O O O O X , , | O O O O X , , | $$ | , O X X X , , | , O X X X , , | , O X X X , , | , O X X X , , | $$ | O O X , , , , | O O X , , , , | O O X , , , , | O O X , , , , | $$ | X X X , , , , | X X X , , , , | X X X , , , , | X X X , , , , | $$ | , , , , , , , | , , , , , , , | , , , , , , , | , , , , , , , | $$ | , , , , , , , | , , , , , , , | , , , , , , , | , , , , , , , | $$ +----------------------------------------------------------------[/go]

AFTER White's single stone in the double-ko has been captured, NO (new) PERMANENT White stone can be played, due to J89's (initial version) double-ko cycle.

-----------------------------------------
[/color]
Second attempt.

Click Here To Show Diagram Code: [go]$$B $$ +---------------------------------------------------------------- $$ | , , , , , , , | , , , , , , , | , , , , , , , | , , , , , , , | $$ | O O , , , , , | O O , , , , , | O O , , , , , | O O , , , , , | $$ | X O , , , , , | X O , , , , , | 4 O , , , , , | W O , , , , , | $$ | . X O O O , , | 2 X O O O , , | O X O O O , , | W X O O O , , | $$ | X X X X O , , | X X X X O , , | X X X X O , , | X X X X O , , | $$ | O X . X O , , | M X , X O , , | M X , X O , , | M X , X O , , | $$ | 1 O X O X , , | X O X O X , , | X , X , X , , | X , X , X , , | $$ | O O O O X , , | O O O O X , , | , , , , X , , | , , , , X , , | $$ | . O X X X , , | 3 O X X X , , | X , X X X , , | X , X X X , , | $$ | O O X , , , , | O O X , , , , | , , X , , , , | , , X , , , , | $$ | X X X , , , , | X X X , , , , | X X X , , , , | X X X , , , , | $$ | , , , , , , , | , , , , , , , | , , , , , , , | , , , , , , , | $$ | , , , , , , , | , , , , , , , | , , , , , , , | , , , , , , , | $$ +----------------------------------------------------------------[/go]

AFTER White's single stone in the double-ko has been captured (with

), (new) PERMANENT White stones could be played (with

and

).
[/color]

Posted: **Sat Sep 18, 2021 7:28 pm**

L&D Example 11

Click Here To Show Diagram Code: [go]$$ $$ +------------------------ $$ | . X P . P . P X . . . | $$ | . X X P P P P X . . . | $$ | . . X X X X X X . . . | $$ | . . . . . . . . . . . | $$ | . . . . . . . . . . . | $$ | . . . . . . . . . . . | $$ | . . . . . . . . . . . | $$ | . O O O X X X . . . . | $$ | . O X X O O X . . . . | $$ | O O X O . O X X X . . | $$ | X X X X O O O O X . . | $$ | X . X . X O . O X . . | $$ +------------------------[/go]

J89's judgement of L&D:

White's stones at the top are of the 7.1.D-type.

NO judgement on the L&D status of the double-ko seki at the bottom.

Why

?

Click Here To Show Diagram Code: [go]$$B :w4: pass [color=#FF0000](missing: "at top")[/color] $$ +------------------------------------------------ $$ | . X O 1 O 5 O X . . . | . X M X M X M X . . . | $$ | . X X O O O O X . . . | . X X M M M M X . . . | $$ | . . X X X X X X . . . | . . X X X X X X . . . | $$ | . . . . . . . . . . . | . . . . . . . . . . . | $$ | . . . . . . . . . . . | . . . . . . . . . . . | $$ | . . . . . . . . . . . | . . . . . . . . . . . | $$ | . . . . . . . . . . . | . . . . . . . . . . . | $$ | . O O O X X X . . . . | . O O O X X X . . . . | $$ | . O X X O O X . . . . | . O X X O O X . . . . | $$ | O O X O 3 O X X X . . | O O X . X O X X X . . | $$ | X X X X O O O O X . . | X X X X O O O O X . . | $$ | X . X 2 X O . O X . . | X . X O . O . O X . . | $$ +------------------------------------------------[/go]

Implicit understanding:
There are NO UNERASABLE ko-threats during L&D status confirmation.
Capturing into a single ko-shape allows playing two moves in a row locally.
There is no double-ko during L&D status confirmation.

Misleading!
The specification of the ko-shape IS REQUIRED for

(but missing) because there are TWO ko-shapes to be re-captured into.

Click Here To Show Diagram Code: [go]$$B :w6: pass; :b7: pass[/color] $$ +------------------------------------------------ $$ | . X M X M X M X . . . | . X M X M X M X . . . | $$ | . X X M M M M X . . . | . X X M M M M X . . . | $$ | . . X X X X X X . . . | . . X X X X X X . . . | $$ | . . . . . . . . . . . | . . . . . . . . . . . | $$ | . . . . . . . . . . . | . . . . . . . . . . . | $$ | . . . . . . . . . . . | . . . . . . . . . . . | $$ | . . . . . . . . . . . | . . . . . . . . . . . | $$ | . O O O X X X . . . . | . O O O X X X . . . . | $$ | . O X X O O X . . . . | . O X X O O X . . . . | $$ | O O X . X O X X X . . | O O X . X O X X X . . | $$ | X X X X O O O O X . . | X X X X O O O O X . . | $$ | X . X O . O . O X . . | X . X O . O . O X . . | $$ +------------------------------------------------[/go]

The L&D-status of White's stones in the upper corner has already been decided by

.
Nevertheless, two passes for the remaining ko-shapes at the bottom are played explicitly.
Contrary to the commentary (7.2.Y+R-type of ko), recapturing into the double-ko is left out here.

Implicit understanding:
An UNERASABLE ko-threat is NOT a means of creating stones of the 7.1.C-type.

Posted: **Sat Sep 18, 2021 9:27 pm**

L&D Example 12

Click Here To Show Diagram Code: [go]$$ $$ +------------------ $$ | @ . W . B O . . | $$ | B W W . B O . . | $$ | B B B B B O . . | $$ | O O O O O O . . | $$ | . . . . . . . . | $$ | . . . . . . . . | $$ +------------------[/go]

J89's judgement of L&D:

Black's stones are of the 7.1.U-type.

White's three stones are of the 7.1.U-type.

White's single stone is of the 7.1.C-type.

Why

?

Click Here To Show Diagram Code: [go]$$W :w3: pass $$ +------------------------------------ $$ | O 2 O 4 X O . . | . B . B B O . . | $$ | X O O 1 X O . . | B . . . B O . . | $$ | X X X X X O . . | B B B B B O . . | $$ | O O O O O O . . | O O O O O O . . | $$ | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | $$ +------------------------------------[/go]

Implicit understanding:
There are NO ko-threats during L&D status confirmation.
Capturing into a single ko-shape allows playing two moves in a row locally.

Why

?

Click Here To Show Diagram Code: [go]$$B :w2: pass; :b5: pass $$ +------------------------------------------------------ $$ | O 1 O . X O . . | 4 X O 6 X O . . | O . W O . O . . | $$ | X O O 3 X O . . | X O O X X O . . | . W W . . O . . | $$ | X X X X X O . . | X X X X X O . . | . . . . . O . . | $$ | O O O O O O . . | O O O O O O . . | O O O O O O . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ | . . . . . . . . | . . . . . . . . | . . . . . . . . | $$ +------------------------------------------------------[/go]

Implicit understanding:
There are NO ko-threats during L&D status confirmation.
Capturing into a single ko-shape allows playing two moves in a row locally.

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Click Here To Show Diagram Code: [go]$$B :w2: pass; :b3: pass; :b5: pass $$ +------------------------------------------------------------------------ $$ | O 1 O ? X O ? ? | 4 X O ? X O ? ? | O 6 O ? X O ? ? | W W O ? X O ? ? | $$ | X O O ? X O ? ? | X O O ? X O ? ? | X O O ? X O ? ? | X O O ? X O ? ? | $$ | X X X X X O ? ? | X X X X X O ? ? | X X X X X O ? ? | X X X X X O ? ? | $$ | O O O O O O ? ? | O O O O O O ? ? | O O O O O O ? ? | O O O O O O ? ? | $$ | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? | $$ +------------------------------------------------------------------------[/go]

Implicit understanding:
There are NO ko-threats during L&D status confirmation.
Capturing into a single ko-shape allows playing two moves in a row locally.

Posted: **Sun Sep 19, 2021 1:15 am**

L&D Example 16

Click Here To Show Diagram Code: [go]$$B $$ +---------------------+ $$ | . . . . . . . . . . | $$ | . . . . . . . . . . | $$ | X X X . . . . . . . | $$ | P P X . . . . . . . | $$ | . P X X X . . . . . | $$ | P P P P X X X O . . | $$ | # P . P P P X O . . | $$ | . B P B B B O O . . | $$ | B B B B . B O . . . | $$ | P P P B B B O . . . | $$ | . P X O O O O . . . | $$ | P P X X X X X . . . | $$ | . P X . . . . . . . | $$ | P X . . . . . . . . | $$ | P X X . . . . . . . | $$ | . P X . . . . . . . | $$ +---------------------+[/go]

J89's judgement of L&D:

White's stones are of of the 7.1.D-type.

Black's twelve stones are of the 7.1.U-type.

Black's single stone is of the 7.1.C-type.

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Implicit APPLICATION:
There are NO ko-threats during L&D status confirmation.
Capturing into a single ko-shape allows playing two moves in a row locally.
There is NO double-ko during L&D status confirmation.
An UNERASABLE ko-threat is NOT a means of creating stones of the 7.1.C-type.

$$B :w2: pass; :w8: pass; :w10: pass (lower ko); :w12: pass; :w14: pass; :b15: pass; :w16: pass; :w18: pass
$$ +-----------------------------------------------------------------------------------------------------------------------------------+
$$ | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? |
$$ | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? |
$$ | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? |
$$ | O O X ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? | M M X ? ? ? ? ? ? ? |
$$ | ? O X X X ? ? ? ? ? | ? O X X X ? ? ? ? ? | ? O X X X ? ? ? ? ? | ? O X X X ? ? ? ? ? | 9 O X X X ? ? ? ? ? | X M X X X ? ? ? ? ? |
$$ | O O O O X X X O ? ? | O O O O X X X O ? ? | O O O O X X X O ? ? | O O O O X X X O ? ? | O O O O X X X O ? ? | M M M M X X X O ? ? |
$$ | X O ? O O O X O ? ? | X O ? O O O X O ? ? | X O 7 O O O X O ? ? | ? O X O O O X O ? ? | 7 O X O O O X O ? ? | X M X M M M X O ? ? |
$$ | ? X O X X X O O ? ? | ? X O X X X O O ? ? | 6 X O X X X O O ? ? | O X ? X X X O O ? ? | O X 3 X X X O O ? ? | M X X X X X O O ? ? |
$$ | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? |
$$ | O O O X X X O ? ? ? | O O O X X X O ? ? ? | O O O X X X O ? ? ? | O O O X X X O ? ? ? | ? ? ? X X X O ? ? ? | M M M X X X O ? ? ? |
$$ | ? O X O O O O ? ? ? | ? O X O O O O ? ? ? | ? O X O O O O ? ? ? | 1 O X O O O O ? ? ? | X ? X O O O O ? ? ? | X M X O O O O ? ? ? |
$$ | O O X X X X X ? ? ? | O O X X X X X ? ? ? | O O X X X X X ? ? ? | O O X X X X X ? ? ? | ? ? X X X X X ? ? ? | M M X X X X X ? ? ? |
$$ | 3 O X ? ? ? ? ? ? ? | X O X ? ? ? ? ? ? ? | 9 O X ? ? ? ? ? ? ? | X O X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X M X ? ? ? ? ? ? ? |
$$ | O X ? ? ? ? ? ? ? ? | 4 X ? ? ? ? ? ? ? ? | O X ? ? ? ? ? ? ? ? | ? X ? ? ? ? ? ? ? ? | ? X ? ? ? ? ? ? ? ? | M X ? ? ? ? ? ? ? ? |
$$ | O X X ? ? ? ? ? ? ? | ? X X ? ? ? ? ? ? ? | 5 X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? |
$$ | 1 O X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X M X ? ? ? ? ? ? ? |
$$ +-----------------------------------------------------------------------------------------------------------------------------------+

Click Here To Show Diagram Code: [go]$$B :w2: pass; :w8: pass; :w10: pass (lower ko); :w12: pass; :w14: pass; :b15: pass; :w16: pass; :w18: pass $$ +-----------------------------------------------------------------------------------------------------------------------------------+ $$ | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | $$ | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | $$ | O O X ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? | M M X ? ? ? ? ? ? ? | $$ | ? O X X X ? ? ? ? ? | ? O X X X ? ? ? ? ? | ? O X X X ? ? ? ? ? | ? O X X X ? ? ? ? ? | 9 O X X X ? ? ? ? ? | X M X X X ? ? ? ? ? | $$ | O O O O X X X O ? ? | O O O O X X X O ? ? | O O O O X X X O ? ? | O O O O X X X O ? ? | O O O O X X X O ? ? | M M M M X X X O ? ? | $$ | X O ? O O O X O ? ? | X O ? O O O X O ? ? | X O 7 O O O X O ? ? | ? O X O O O X O ? ? | 7 O X O O O X O ? ? | X M X M M M X O ? ? | $$ | ? X O X X X O O ? ? | ? X O X X X O O ? ? | 6 X O X X X O O ? ? | O X ? X X X O O ? ? | O X 3 X X X O O ? ? | M X X X X X O O ? ? | $$ | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | $$ | O O O X X X O ? ? ? | O O O X X X O ? ? ? | O O O X X X O ? ? ? | O O O X X X O ? ? ? | ? ? ? X X X O ? ? ? | M M M X X X O ? ? ? | $$ | ? O X O O O O ? ? ? | ? O X O O O O ? ? ? | ? O X O O O O ? ? ? | 1 O X O O O O ? ? ? | X ? X O O O O ? ? ? | X M X O O O O ? ? ? | $$ | O O X X X X X ? ? ? | O O X X X X X ? ? ? | O O X X X X X ? ? ? | O O X X X X X ? ? ? | ? ? X X X X X ? ? ? | M M X X X X X ? ? ? | $$ | 3 O X ? ? ? ? ? ? ? | X O X ? ? ? ? ? ? ? | 9 O X ? ? ? ? ? ? ? | X O X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X M X ? ? ? ? ? ? ? | $$ | O X ? ? ? ? ? ? ? ? | 4 X ? ? ? ? ? ? ? ? | O X ? ? ? ? ? ? ? ? | ? X ? ? ? ? ? ? ? ? | ? X ? ? ? ? ? ? ? ? | M X ? ? ? ? ? ? ? ? | $$ | O X X ? ? ? ? ? ? ? | ? X X ? ? ? ? ? ? ? | 5 X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | $$ | 1 O X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X M X ? ? ? ? ? ? ? | $$ +-----------------------------------------------------------------------------------------------------------------------------------+[/go]

Blueprint is the sequence in the commentary (7.2.Y+R-type of ko).

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

$$W :w3: pass; :w5: pass; :w9: pass; :w11: pass; :w13: pass; :w15: pass; :b16: pass; :w17: pass; :w19: pass
$$ +-------------------------------------------------------------------------------------------------------------+
$$ | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? |
$$ | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? |
$$ | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? |
$$ | O O X ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? | ? ? X ? ? ? ? ? ? ? |
$$ | ? O X X X ? ? ? ? ? | ? O X X X ? ? ? ? ? | ? O X X X ? ? ? ? ? | 0 O X X X ? ? ? ? ? | X ? X X X ? ? ? ? ? |
$$ | O O O O X X X O ? ? | O O O O X X X O ? ? | O O O O X X X O ? ? | O O O O X X X O ? ? | ? ? ? ? X X X O ? ? |
$$ | X O 2 O O O X O ? ? | M O X O O O X O ? ? | M O X O O O X O ? ? | 8 O X O O O X O ? ? | B ? X ? ? ? X O ? ? |
$$ | 1 X O X X X O O ? ? | O X T X X X O O ? ? | O X T X X X O O ? ? | O X 4 X X X O O ? ? | ? X X X X X O O ? ? |
$$ | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? |
$$ | O O O X X X O ? ? ? | O O O X X X O ? ? ? | O O O X X X O ? ? ? | ? ? ? X X X O ? ? ? | ? ? ? X X X O ? ? ? |
$$ | ? O X O O O O ? ? ? | ? O X O O O O ? ? ? | 2 O X O O O O ? ? ? | X ? X O O O O ? ? ? | X ? X O O O O ? ? ? |
$$ | O O X X X X X ? ? ? | O O X X X X X ? ? ? | O O X X X X X ? ? ? | ? ? X X X X X ? ? ? | ? ? X X X X X ? ? ? |
$$ | 6 O X ? ? ? ? ? ? ? | X O X ? ? ? ? ? ? ? | 0 O X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? |
$$ | O X ? ? ? ? ? ? ? ? | 7 X ? ? ? ? ? ? ? ? | O X ? ? ? ? ? ? ? ? | ? X ? ? ? ? ? ? ? ? | ? X ? ? ? ? ? ? ? ? |
$$ | O X X ? ? ? ? ? ? ? | ? X X ? ? ? ? ? ? ? | 8 X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? |
$$ | 4 O X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? |
$$ +-------------------------------------------------------------------------------------------------------------+

Click Here To Show Diagram Code: [go]$$W :w3: pass; :w5: pass; :w9: pass; :w11: pass; :w13: pass; :w15: pass; :b16: pass; :w17: pass; :w19: pass $$ +-------------------------------------------------------------------------------------------------------------+ $$ | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? | $$ | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | $$ | O O X ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? | ? ? X ? ? ? ? ? ? ? | $$ | ? O X X X ? ? ? ? ? | ? O X X X ? ? ? ? ? | ? O X X X ? ? ? ? ? | 0 O X X X ? ? ? ? ? | X ? X X X ? ? ? ? ? | $$ | O O O O X X X O ? ? | O O O O X X X O ? ? | O O O O X X X O ? ? | O O O O X X X O ? ? | ? ? ? ? X X X O ? ? | $$ | X O 2 O O O X O ? ? | M O X O O O X O ? ? | M O X O O O X O ? ? | 8 O X O O O X O ? ? | B ? X ? ? ? X O ? ? | $$ | 1 X O X X X O O ? ? | O X T X X X O O ? ? | O X T X X X O O ? ? | O X 4 X X X O O ? ? | ? X X X X X O O ? ? | $$ | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | X X X X ? X O ? ? ? | $$ | O O O X X X O ? ? ? | O O O X X X O ? ? ? | O O O X X X O ? ? ? | ? ? ? X X X O ? ? ? | ? ? ? X X X O ? ? ? | $$ | ? O X O O O O ? ? ? | ? O X O O O O ? ? ? | 2 O X O O O O ? ? ? | X ? X O O O O ? ? ? | X ? X O O O O ? ? ? | $$ | O O X X X X X ? ? ? | O O X X X X X ? ? ? | O O X X X X X ? ? ? | ? ? X X X X X ? ? ? | ? ? X X X X X ? ? ? | $$ | 6 O X ? ? ? ? ? ? ? | X O X ? ? ? ? ? ? ? | 0 O X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | $$ | O X ? ? ? ? ? ? ? ? | 7 X ? ? ? ? ? ? ? ? | O X ? ? ? ? ? ? ? ? | ? X ? ? ? ? ? ? ? ? | ? X ? ? ? ? ? ? ? ? | $$ | O X X ? ? ? ? ? ? ? | ? X X ? ? ? ? ? ? ? | 8 X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? | $$ | 4 O X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | X ? X ? ? ? ? ? ? ? | $$ +-------------------------------------------------------------------------------------------------------------+[/go]

AFTER Black's single stone in the double-ko has been captured (with

), it could be re-established (with

).

Alternatively, Black could be content with having placed a (new) PERMANENT stone with

.

=============================================
=============================================

MISTAKE in J89's INITIAL version???

Click Here To Show Diagram Code: [go]$$B $$ +---------------------+ $$ | , , , , , , , , , , | $$ | , , , , , , , , , , | $$ | X X X , , , , , , , | $$ | W W X , , , , , , , | $$ | , W X X X , , , , , | $$ | W W W W X X X O , , | $$ | # W , W W W X O , , | $$ | t B P B B B O O , , | $$ | B B B B t B O , , , | $$ | W W W B B B O , , , | $$ | t W X O O O O , , , | $$ | W W X X X X X , , , | $$ | , W X , , , , , , , | $$ | @ X , , , , , , , , | $$ | @ X X , , , , , , , | $$ | , P X , , , , , , , | $$ +---------------------+[/go]

This diagram shows the CORRECT judgement when applying J89's initial version of the L&D status confirmation.
Please note that the points T are territory!

Why

?

$$B :w4: pass upper ko; :w5: pass; :w8: pass upper ko; :b9: pass
$$ +-------------------------------------------------------------------------------------------------------------+
$$ | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , |
$$ | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , |
$$ | X X X , , , , , , , | X X X , , , , , , , | X X X , , , , , , , | X X X , , , , , , , | X X X , , , , , , , |
$$ | O O X , , , , , , , | O O X , , , , , , , | O O X , , , , , , , | O O X , , , , , , , | W W X , , , , , , , |
$$ | , O X X X , , , , , | , O X X X , , , , , | , O X X X , , , , , | , O X X X , , , , , | , W X X X , , , , , |
$$ | O O O O X X X O , , | O O O O X X X O , , | O O O O X X X O , , | O O O O X X X O , , | W W W W X X X O , , |
$$ | X O 3 O O O X O , , | , O X O O O X O , , | 7 O X O O O X O , , | X O , O O O X O , , | X W , W W W X O , , |
$$ | 2 X O X X X O O , , | O X , X X X O O , , | O X 6 X X X O O , , | , X O X X X O O , , | , X O X X X O O , , |
$$ | X X X X , X O , , , | X X X X , X O , , , | X X X X , X O , , , | X X X X , X O , , , | X X X X , X O , , , |
$$ | O O O X X X O , , , | O O O X X X O , , , | O O O X X X O , , , | O O O X X X O , , , | W W W X X X O , , , |
$$ | , O X O O O O , , , | , O X O O O O , , , | , O X O O O O , , , | , O X O O O O , , , | , W X O O O O , , , |
$$ | O O X X X X X , , , | O O X X X X X , , , | O O X X X X X , , , | O O X X X X X , , , | W W X X X X X , , , |
$$ | , O X , , , , , , , | , O X , , , , , , , | , O X , , , , , , , | , O X , , , , , , , | , W X , , , , , , , |
$$ | O X , , , , , , , , | O X , , , , , , , , | O X , , , , , , , , | O X , , , , , , , , | O X , , , , , , , , |
$$ | O X X , , , , , , , | O X X , , , , , , , | O X X , , , , , , , | O X X , , , , , , , | O X X , , , , , , , |
$$ | 1 O X , , , , , , , | X , X , , , , , , , | X , X , , , , , , , | X , X , , , , , , , | X , X , , , , , , , |
$$ +-------------------------------------------------------------------------------------------------------------+

Click Here To Show Diagram Code: [go]$$B :w4: pass upper ko; :w5: pass; :w8: pass upper ko; :b9: pass $$ +-------------------------------------------------------------------------------------------------------------+ $$ | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | $$ | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | $$ | X X X , , , , , , , | X X X , , , , , , , | X X X , , , , , , , | X X X , , , , , , , | X X X , , , , , , , | $$ | O O X , , , , , , , | O O X , , , , , , , | O O X , , , , , , , | O O X , , , , , , , | W W X , , , , , , , | $$ | , O X X X , , , , , | , O X X X , , , , , | , O X X X , , , , , | , O X X X , , , , , | , W X X X , , , , , | $$ | O O O O X X X O , , | O O O O X X X O , , | O O O O X X X O , , | O O O O X X X O , , | W W W W X X X O , , | $$ | X O 3 O O O X O , , | , O X O O O X O , , | 7 O X O O O X O , , | X O , O O O X O , , | X W , W W W X O , , | $$ | 2 X O X X X O O , , | O X , X X X O O , , | O X 6 X X X O O , , | , X O X X X O O , , | , X O X X X O O , , | $$ | X X X X , X O , , , | X X X X , X O , , , | X X X X , X O , , , | X X X X , X O , , , | X X X X , X O , , , | $$ | O O O X X X O , , , | O O O X X X O , , , | O O O X X X O , , , | O O O X X X O , , , | W W W X X X O , , , | $$ | , O X O O O O , , , | , O X O O O O , , , | , O X O O O O , , , | , O X O O O O , , , | , W X O O O O , , , | $$ | O O X X X X X , , , | O O X X X X X , , , | O O X X X X X , , , | O O X X X X X , , , | W W X X X X X , , , | $$ | , O X , , , , , , , | , O X , , , , , , , | , O X , , , , , , , | , O X , , , , , , , | , W X , , , , , , , | $$ | O X , , , , , , , , | O X , , , , , , , , | O X , , , , , , , , | O X , , , , , , , , | O X , , , , , , , , | $$ | O X X , , , , , , , | O X X , , , , , , , | O X X , , , , , , , | O X X , , , , , , , | O X X , , , , , , , | $$ | 1 O X , , , , , , , | X , X , , , , , , , | X , X , , , , , , , | X , X , , , , , , , | X , X , , , , , , , | $$ +-------------------------------------------------------------------------------------------------------------+[/go]

Why

?

Click Here To Show Diagram Code: [go]$$B $$ +-----------------------------------------------------------------+ $$ | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | $$ | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | $$ | X X X , , , , , , , | X X X , , , , , , , | X X X , , , , , , , | $$ | O O X , , , , , , , | O O X , , , , , , , | O O X , , , , , , , | $$ | , O X X X , , , , , | , O X X X , , , , , | , O X X X , , , , , | $$ | O O O O X X X O , , | O O O O X X X O , , | O O O O X X X O , , | $$ | X O , O O O X O , , | , O , O O O X O , , | , O , O O O X O , , | $$ | 2 X O X X X O O , , | O X O X X X O O , , | O , O , , , O O , , | $$ | X X X X , X O , , , | X X X X 4 X O , , , | , , , , W , O , , , | $$ | O O O X X X O , , , | O O O X X X O , , , | O O O , , , O , , , | $$ | , O X O O O O , , , | , O X O O O O , , , | , O X O O O O , , , | $$ | O O X X X X X , , , | O O X X X X X , , , | O O X X X X X , , , | $$ | 3 O X , , , , , , , | X O X , , , , , , , | X O X , , , , , , , | $$ | O X , , , , , , , , | M X , , , , , , , , | M X , , , , , , , , | $$ | O X X , , , , , , , | M X X , , , , , , , | M X X , , , , , , , | $$ | 1 O X , , , , , , , | X , X , , , , , , , | X , X , , , , , , , | $$ +-----------------------------------------------------------------+[/go]

The capture of White's two stones at the left (with

) enabled a (new) PERMANENT White stone (with

).

Why

?

Click Here To Show Diagram Code: [go]$$W $$ +---------------------------------------------------------------------------------------+ $$ | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | $$ | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | , , , , , , , , , , | $$ | X X X , , , , , , , | X X X , , , , , , , | X X X , , , , , , , | X X X , , , , , , , | $$ | O O X , , , , , , , | O O X , , , , , , , | O O X , , , , , , , | O O X , , , , , , , | $$ | , O X X X , , , , , | , O X X X , , , , , | , O X X X , , , , , | , O X X X , , , , , | $$ | O O O O X X X O , , | O O O O X X X O , , | O O O O X X X O , , | O O O O X X X O , , | $$ | X O , O O O X O , , | M O , O O O X O , , | M O , O O O X O , , | M O , O O O X O , , | $$ | 1 X O X X X O O , , | O X O X X X O O , , | O , O , , , O O , , | O , O , , , O O , , | $$ | X X X X , X O , , , | X X X X 3 X O , , , | , , , , O , O , , , | , , , , O , O , , , | $$ | O O O X X X O , , , | O O O X X X O , , , | O O O , , , O , , , | O O O , , , O , , , | $$ | , O X O O O O , , , | , O X O O O O , , , | , O X O O O O , , , | , O X O O O O , , , | $$ | O O X X X X X , , , | O O X X X X X , , , | O O X X X X X , , , | O O X X X X X , , , | $$ | , O X , , , , , , , | 4 O X , , , , , , , | X O X , , , , , , , | , O X , , , , , , , | $$ | O X , , , , , , , , | O X , , , , , , , , | 5 X , , , , , , , , | O X , , , , , , , , | $$ | O X X , , , , , , , | O X X , , , , , , , | 6 X X , , , , , , , | B X X , , , , , , , | $$ | , O X , , , , , , , | 2 O X , , , , , , , | X , X , , , , , , , | B , X , , , , , , , | $$ +---------------------------------------------------------------------------------------+[/go]

The capture of Black's single stone at the left edge (with

) enabled (new) PERMANENT Black stones (with

and

).[/color]

Posted: **Sun Sep 19, 2021 5:42 am**

L&D Example 17

Click Here To Show Diagram Code: [go]$$B $$ +---------------------------------------------------- $$ | . . . . . . . . . . . . | ? ? ? ? ? ? ? ? ? ? ? ? | $$ | . . . . . . . . . . . . | ? ? ? ? ? ? ? ? ? ? ? ? | $$ | X X X . . . . . . . . . | X X X ? ? ? ? ? ? ? ? ? | $$ | P P X . . . . . . . . . | P P X ? ? ? ? ? ? ? ? ? | $$ | . P X X X . . . . . . . | ? P X X X ? ? ? ? ? ? ? | $$ | P P P P X . . . . . . . | P P P P X ? ? ? ? ? ? ? | $$ | X P . P X O O O O . . . | # P ? P X O O O O ? ? ? | $$ | . X P X O O X X O . . . | ? B P B O O B B O ? ? ? | $$ | X X X X X X . X O . . . | B B B B B B . B O ? ? ? | $$ | P P P X O X X X O . . . | P P P B O B B B O ? ? ? | $$ | . P X O O O O O O X . . | ? P X O O O O O O X ? ? | $$ | # P X X X X X X X X . . | # P X X X X X X X X ? ? | $$ | # P P P X X . . . . . . | # P P P X X ? ? ? ? ? ? | $$ | # . P . P X . . . . . . | # ? P ? P X ? ? ? ? ? ? | $$ +----------------------------------------------------[/go]

J89's judgement of L&D:

White's stones are of of the 7.1.D-type.

Black's 15 stones are of the 7.1.U-type.

Black's four stones at the left edge are of the 7.1.C-type.

Please note that there is NO explicit status for Black's stones in the double-ko in J89's comment to this example.

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Implicit APPLICATION:
There are NO ko-threats during L&D status confirmation.
Capturing into a single ko-shape allows playing two moves in a row locally.
There is NO double-ko during L&D status confirmation.
An UNERASABLE ko-threat is NOT a means of creating stones of the 7.1.C-type.

Click Here To Show Diagram Code: [go]$$B :w2: pass; :w6: pass; :w10: pass; :w12: pass; :w14: pass; :w16: pass; :w18: pass; :w20: pass; :w22: pass; :b23: pass; :w24: pass; :w26: pass $$ +------------------------------------------------------------------------------------------------------------------------------------------------ $$ | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | $$ | X X X ? ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? ? | $$ | O O X ? ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? ? | M M X ? ? ? ? ? ? ? ? | $$ | ? O X X X ? ? ? ? ? ? | ? O X X X ? ? ? ? ? ? | ? O X X X ? ? ? ? ? ? | ? O X X X ? ? ? ? ? ? | 7 O X X X ? ? ? ? ? ? | X M X X X ? ? ? ? ? ? | $$ | O O O O X ? ? ? ? ? ? | O O O O X ? ? ? ? ? ? | O O O O X ? ? ? ? ? ? | O O O O X ? ? ? ? ? ? | O O O O X ? ? ? ? ? ? | M M M M X ? ? ? ? ? ? | $$ | X O ? O X O O O O ? ? | X O 5 O X O O O O ? ? | ? O X O X O O O O ? ? | ? O X O X O O O O ? ? | 5 O X O X O O O O ? ? | X M X M X O O O O ? ? | $$ | ? X O X O O X X O ? ? | 4 X O X O O X X O ? ? | O X ? X O O X X O ? ? | O X ? X O O X X O ? ? | O X 1 X O O X X O ? ? | M X X X O O X X O ? ? | $$ | X X X X X X ? X O ? ? | X X X X X X ? X O ? ? | X X X X X X ? X O ? ? | X X X X X X ? X O ? ? | X X X X X X ? X O ? ? | X X X X X X ? X O ? ? | $$ | O O O X O X X X O ? ? | O O O X O X X X O ? ? | O O O X O X X X O ? ? | O O O X O X X X O ? ? | ? ? ? X O X X X O ? ? | M M M X O X X X O ? ? | $$ | ? O X O O O O O O X ? | 8 O X O O O O O O X ? | O O X O O O O O O X ? | O O X O O O O O O X ? | ? ? X O O O O O O X ? | M M X O O O O O O X ? | $$ | X O X X X X X X X X ? | X O X X X X X X X X ? | 4 O X X X X X X X X ? | O O X X X X X X X X ? | ? ? X X X X X X X X ? | M M X X X X X X X X ? | $$ | X O O O X X ? ? ? ? ? | X O O O X X ? ? ? ? ? | 9 O O O X X ? ? ? ? ? | 9 O O O X X ? ? ? ? ? | X ? ? ? X X ? ? ? ? ? | X M M M X X ? ? ? ? ? | $$ | X ? O 1 O X ? ? ? ? ? | X 7 O X 3 X ? ? ? ? ? | 1 3 O X X X ? ? ? ? ? | 5 7 O X X X ? ? ? ? ? | X X ? X X X ? ? ? ? ? | X X M X X X ? ? ? ? ? | $$ +------------------------------------------------------------------------------------------------------------------------------------------------[/go]

Blueprint is the sequence in the commentary (7.2.Y+R-type of ko).

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Click Here To Show Diagram Code: [go]$$W $$ +------------------------------------------------------------------------------ $$ | ? ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? ? | $$ | X X X ? ? ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? ? ? | $$ | O O X ? ? ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? ? ? | $$ | ? O X X X ? ? ? ? ? ? ? | ? O X X X ? ? ? ? ? ? ? | ? O X X X ? ? ? ? ? ? ? | $$ | O O O O X ? ? ? ? ? ? ? | O O O O X ? ? ? ? ? ? ? | O O O O X ? ? ? ? ? ? ? | $$ | X O ? O X O O O O ? ? ? | M O ? O X O O O O ? ? ? | M O ? O X O O O O ? ? ? | $$ | 1 X O X O O X X O ? ? ? | O X O X O O X X O ? ? ? | O ? O ? O O ? ? O ? ? ? | $$ | X X X X X X ? X O ? ? ? | X X X X X X 3 X O ? ? ? | ? ? ? ? ? ? O ? O ? ? ? | $$ | O O O X O X X X O ? ? ? | O O O X O X X X O ? ? ? | O O O X O ? ? ? O ? ? ? | $$ | ? O X O O O O O O X ? ? | ? O X O O O O O O X ? ? | ? O X O O O O O O X ? ? | $$ | X O X X X X X X X X ? ? | X O X X X X X X X X ? ? | X O X X X X X X X X ? ? | $$ | X O O O X X ? ? ? ? ? ? | X O O O X X ? ? ? ? ? ? | X O O O X X ? ? ? ? ? ? | $$ | X ? O 2 O X ? ? ? ? ? ? | X ? O X 4 X ? ? ? ? ? ? | X ? O B B X ? ? ? ? ? ? | $$ +------------------------------------------------------------------------------[/go]

AFTER Black's single stone in the double-ko has been captured (with

), Black could play (new) PERMANENT stones (with

and

).

Alternatively, Black could have captured into the double-ko with

, reverting to the sequence for

above.

--------------------------------------------------------

Click Here To Show Diagram Code: [go]$$W $$ +------------------------------------------------------------------------------ $$ | ? ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? ? | $$ | X X X ? ? ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? ? ? | X X X ? ? ? ? ? ? ? ? ? | $$ | O O X ? ? ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? ? ? | O O X ? ? ? ? ? ? ? ? ? | $$ | ? O X X X ? ? ? ? ? ? ? | ? O X X X ? ? ? ? ? ? ? | ? O X X X ? ? ? ? ? ? ? | $$ | O O O O X ? ? ? ? ? ? ? | O O O O X ? ? ? ? ? ? ? | O O O O X ? ? ? ? ? ? ? | $$ | X O ? O X O O O O ? ? ? | X O ? O X O O O O ? ? ? | X O ? O X O O O O ? ? ? | $$ | ? X O X O O X X O ? ? ? | ? X O X O O X X O ? ? ? | ? X O X O O X X O ? ? ? | $$ | X X X X X X ? X O ? ? ? | X X X X X X ? X O ? ? ? | X X X X X X ? X O ? ? ? | $$ | O O O X O X X X O ? ? ? | O O O X O X X X O ? ? ? | O O O X O X X X O ? ? ? | $$ | 1 O X O O O O O O X ? ? | O O X O O O O O O X ? ? | O O X O O O O O O X ? ? | $$ | X O X X X X X X X X ? ? | M O X X X X X X X X ? ? | M O X X X X X X X X ? ? | $$ | X O O O X X ? ? ? ? ? ? | M O O O X X ? ? ? ? ? ? | M O O O X X ? ? ? ? ? ? | $$ | X 3 O 2 O X ? ? ? ? ? ? | M O O X 4 X ? ? ? ? ? ? | M ? O X B X ? ? ? ? ? ? | $$ +------------------------------------------------------------------------------[/go]

AFTER Black's three stones in the corner have been captured (with

), Black could play a (new) PERMANENT stone (with

).

Alternatively, Black could have played into White's eye in the corner with

, reverting to the sequence for

above.

=============================================
=============================================

MISTAKE in J89's INITIAL version???

Click Here To Show Diagram Code: [go]$$B $$ +-------------------------- $$ | , , , , , , , , , , , , | $$ | , , , , , , , , , , , , | $$ | X X X , , , , , , , , , | $$ | W W X , , , , , , , , , | $$ | , W X X X , , , , , , , | $$ | W W W W X , , , , , , , | $$ | # W , W X O O O O , , , | $$ | t B P B O O B B O , , , | $$ | B B B B B B t B O , , , | $$ | W W W B O B B B O , , , | $$ | , W X O O O O O O X , , | $$ | # W X X X X X X X X , , | $$ | # W W W X X , , , , , , | $$ | # , W , P X , , , , , , | $$ +--------------------------[/go]

This diagram shows the CORRECT judgement when applying J89's initial version of the L&D status confirmation.
Please note that the points T are territory!

Why

?

Click Here To Show Diagram Code: [go]$$B :w4: pass upper ko; :b5: pass; :w8: pass upper ko; :b9: pass $$ +---------------------------------------------------------------------------------------------------------------------------------- $$ | , , , , , , , , , , , , | , , , , , , , , , , , , | , , , , , , , , , , , , | , , , , , , , , , , , , | , , , , , , , , , , , , | $$ | , , , , , , , , , , , , | , , , , , , , , , , , , | , , , , , , , , , , , , | , , , , , , , , , , , , | , , , , , , , , , , , , | $$ | X X X , , , , , , , , , | X X X , , , , , , , , , | X X X , , , , , , , , , | X X X , , , , , , , , , | X X X , , , , , , , , , | $$ | O O X , , , , , , , , , | O O X , , , , , , , , , | O O X , , , , , , , , , | O O X , , , , , , , , , | W W X , , , , , , , , , | $$ | , O X X X , , , , , , , | , O X X X , , , , , , , | , O X X X , , , , , , , | , O X X X , , , , , , , | , W X X X , , , , , , , | $$ | O O O O X , , , , , , , | O O O O X , , , , , , , | O O O O X , , , , , , , | O O O O X , , , , , , , | W W W W X , , , , , , , | $$ | X O 3 O X O O O O , , , | , O X O X O O O O , , , | 7 O X O X O O O O , , , | X O , O X O O O O , , , | X W , W X O O O O , , , | $$ | 2 X O X O O X X O , , , | O X , X O O X X O , , , | O X 6 X O O X X O , , , | , X O X O O X X O , , , | , X O X O O X X O , , , | $$ | X X X X X X , X O , , , | X X X X X X , X O , , , | X X X X X X , X O , , , | X X X X X X , X O , , , | X X X X X X , X O , , , | $$ | O O O X O X X X O , , , | O O O X O X X X O , , , | O O O X O X X X O , , , | O O O X O X X X O , , , | W W W X O X X X O , , , | $$ | , O X O O O O O O X , , | , O X O O O O O O X , , | , O X O O O O O O X , , | , O X O O O O O O X , , | , W X O O O O O O X , , | $$ | X O X X X X X X X X , , | X O X X X X X X X X , , | X O X X X X X X X X , , | X O X X X X X X X X , , | X W X X X X X X X X , , | $$ | X O O O X X , , , , , , | X O O O X X , , , , , , | X O O O X X , , , , , , | X O O O X X , , , , , , | X W W W X X , , , , , , | $$ | X , O 1 O X , , , , , , | X , O X , X , , , , , , | X , O X , X , , , , , , | X , O X , X , , , , , , | X , W X , X , , , , , , | $$ +----------------------------------------------------------------------------------------------------------------------------------[/go]

[/color]

Posted: **Sun Sep 19, 2021 11:39 am**

L&D Example 18

Click Here To Show Diagram Code: [go]$$B $$ +------------------------------------------------ $$ | . W . Z O Z O . . . . | ? W ? Z W Z O ? ? ? ? | $$ | W Z Z Z O Z O O . . . | W Z Z Z W Z O O ? ? ? | $$ | . Z O O O Z Z O O . . | ? Z W W W Z Z O O ? ? | $$ | Z Z O O . O Z Z O . . | Z Z W W ? @ Z Z O ? ? | $$ | O O O . O Z . Z O . . | W W W ? W Z ? Z O ? ? | $$ | X X O O Z . Z Z O . . | X X W W Z ? Z Z O ? ? | $$ | . X X O O Z Z O . . . | ? X X W W Z Z O ? ? ? | $$ | . . X X X O O O . . . | ? ? X X X O O O ? ? ? | $$ | . . . . . . . . . . . | ? ? ? ? ? ? ? ? ? ? ? | $$ | . . . . . . . . . . . | ? ? ? ? ? ? ? ? ? ? ? | $$ +------------------------------------------------[/go]

J89's judgement of L&D:

Black's stones are of the 7.1.D-type.

White's two stones in the corner and 15 stones in the double-ko are of the 7.1.U-type.

White's single stone in the double-ko is of the 7.1.C-type.

Please note that there is NO explicit status for White's stones in the double-ko in J89's comment to this example.

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Implicit APPLICATION:
There are NO ko-threats during L&D status confirmation.
Capturing into a single ko-shape allows playing two moves in a row locally.
There is NO double-ko during L&D status confirmation.
An UNERASABLE ko-threat is NOT a means of creating stones of the 7.1.C-type.

Click Here To Show Diagram Code: [go]$$W :b2: pass; :b8: pass; :b10: pass; :b14: pass; :b16: pass; :b18: pass; :b20: pass; :w21: pass; :b22: pass; :b24: pass $$ +------------------------------------------------------------------------------------------------------------------------ $$ | 1 O 3 X O X O ? ? ? ? | 9 5 2 X O X O ? ? ? ? | 3 5 X X O X O ? ? ? ? | O O ? ? O X O ? ? ? ? | O O M M O M O ? ? ? ? | $$ | O X X X O X O O ? ? ? | 1 X X X O X O O ? ? ? | 7 X X X O X O O ? ? ? | O ? ? ? O X O O ? ? ? | O M M M O M O O ? ? ? | $$ | 4 X O O O X X O O ? ? | X X O O O X X O O ? ? | X X O O O X X O O ? ? | ? ? O O O X X O O ? ? | M M O O O M M O O ? ? | $$ | X X O O ? O X X O ? ? | X X O O 6 O X X O ? ? | X X O O X M X X O ? ? | ? ? O O X 3 X X O ? ? | M M O O ? O M M O ? ? | $$ | O O O ? O X ? X O ? ? | O O O ? O X ? X O ? ? | O O O ? O X ? X O ? ? | O O O ? O X 5 X O ? ? | O O O ? O M O M O ? ? | $$ | X X O O X ? X X O ? ? | X X O O X 7 X X O ? ? | X X O O T O X X O ? ? | X X O O 9 O X X O ? ? | X X O O O O M M O ? ? | $$ | ? X X O O X X O ? ? ? | ? X X O O X X O ? ? ? | ? X X O O X X O ? ? ? | ? X X O O X X O ? ? ? | ? X X O O M M O ? ? ? | $$ | ? ? X X X O O O ? ? ? | ? ? X X X O O O ? ? ? | ? ? X X X O O O ? ? ? | ? ? X X X O O O ? ? ? | ? ? X X X O O O ? ? ? | $$ | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | $$ +----------------------------------------------------------------------------------------------------------------------–-[/go]

Blueprint is the sequence in the commentary (7.2.Y+R-type of ko).

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Why

?

NOT SHOWN.

Implicit understanding:
Considered redundant?

Click Here To Show Diagram Code: [go]$$B :b3: pass (for ko); :w4: pass (NOT for ko) $$ +------------------------------------------------------------------------ $$ | ? O ? X O X O ? ? ? ? | ? O ? X O X O ? ? ? ? | ? O ? X O X O ? ? ? ? | $$ | O X X X O X O O ? ? ? | O X X X O X O O ? ? ? | O X X X O X O O ? ? ? | $$ | ? X O O O X X O O ? ? | ? X O O O X X O O ? ? | ? X O O O X X O O ? ? | $$ | X X O O 1 O X X O ? ? | X X O O X M X X O ? ? | X X O O X M X X O ? ? | $$ | O O O ? O X ? X O ? ? | O O O ? O X ? X O ? ? | O O O ? O X ? X O ? ? | $$ | X X O O X 2 X X O ? ? | X X O O T O X X O ? ? | X X O O ? W X X O ? ? | $$ | ? X X O O X X O ? ? ? | ? X X O O X X O ? ? ? | ? X X O O X X O ? ? ? | $$ | ? ? X X X O O O ? ? ? | ? ? X X X O O O ? ? ? | ? ? X X X O O O ? ? ? | $$ | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | $$ | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? | $$ +----------------------–-------------------------------------------------[/go]

AFTER White's single stone in the double-ko has been captured (with

), White could play a (new) PERMANENT stone (with

).

Alternatively, White could connect in the corner with

, reverting to the sequence for

above.

=============================================
=============================================

MISTAKE in J89's INITIAL version???

Click Here To Show Diagram Code: [go]$$B $$ +------------------------ $$ | , W , B W B O , , , , | $$ | W B B B W B O O , , , | $$ | , B W W W B B O O , , | $$ | B B W W , P B B O , , | $$ | W W W , W B , B O , , | $$ | X X W W Z , B X O , , | $$ | , X X W W B B O , , , | $$ | , , X X X O O O , , , | $$ | , , , , , , , , , , , | $$ | , , , , , , , , , , , | $$ +----------------------–-[/go]

This diagram shows the CORRECT judgement when applying J89's initial version of the L&D status confirmation.

Why

?

Click Here To Show Diagram Code: [go]$$W :b4: pass; :w5: pass; :b8: pass; :w9: pass $$ +------------------------------------------------------------------------------------------------------------------------ $$ | 1 O , X O X O , , , , | O O , X O X O , , , , | O O , X O X O , , , , | O O , X O X O , , , , | O O , B O B O , , , , | $$ | O X X X O X O O , , , | O X X X O X O O , , , | O X X X O X O O , , , | O X X X O X O O , , , | O B B B O B O O , , , | $$ | , X O O O X X O O , , | , X O O O X X O O , , | , X O O O X X O O , , | , X O O O X X O O , , | , B O O O B B O O , , | $$ | X X O O 2 O X X O , , | X X O O X , X X O , , | X X O O X 7 X X O , , | X X O O , O X X O , , | B B O O , O B B O , , | $$ | O O O , O X , X O , , | O O O , O X , X O , , | O O O , O X , X O , , | O O O , O X , X O , , | O O O , O B , B O , , | $$ | X X O O X 3 X X O , , | X X O O , O X X O , , | X X O O 6 O X X O , , | X X O O X , X X O , , | X X O O X , B B O , , | $$ | , X X O O X X O , , , | , X X O O X X O , , , | , X X O O X X O , , , | , X X O O X X O , , , | , X X O O B B O , , , | $$ | , , X X X O O O , , , | , , X X X O O O , , , | , , X X X O O O , , , | , , X X X O O O , , , | , , X X X O O O , , , | $$ | , , , , , , , , , , , | , , , , , , , , , , , | , , , , , , , , , , , | , , , , , , , , , , , | , , , , , , , , , , , | $$ | , , , , , , , , , , , | , , , , , , , , , , , | , , , , , , , , , , , | , , , , , , , , , , , | , , , , , , , , , , , | $$ +----------------------------------------------------------------------------------------------------------------------–-[/go]

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Life In 19x19

J89's Article 7 (L&D):: Reverse engineered

J89's Article 7 (L&D):: Reverse engineered

Re: J89's Article 7 (L&D):: Reverse engineered

Re: J89's Article 7 (L&D):: Reverse engineered

Re: J89's Article 7 (L&D):: Reverse engineered

Re: J89's Article 7 (L&D):: Reverse engineered

Re: J89's Article 7 (L&D):: Reverse engineered

Re: J89's Article 7 (L&D):: Reverse engineered

Re: J89's Article 7 (L&D):: Reverse engineered

Re: J89's Article 7 (L&D):: Reverse engineered

Re: J89's Article 7 (L&D):: Reverse engineered

Re: J89's Article 7 (L&D):: Reverse engineered

Re: J89's Article 7 (L&D):: Reverse engineered

Re: J89's Article 7 (L&D):: Reverse engineered

Re: J89's Article 7 (L&D):: Reverse engineered

Re: J89's Article 7 (L&D):: Reverse engineered