Dosaku's Masterpiece - study

xed_over · #1

Let's study a game... I've got a copy of a commented sgf that was adapted from Ohira Shuzo's book Appreciating Famous Games (translated by John Fairbairn)

I don't know the author of the abridged commentary. A record on gobase.org has the initials UC for the comments, but none of the variations.

The sgf record I have has many, if not most of the variations from the book, but none of the mentioned markup. Since it differed from the book slightly from time to time, I did my best to guess at the markup referred to in UC's comments.

The commentator says his comments and variations were adapted from commentaries by both Ohira Shuzo and Go Seigen. I only have Ohira's book (in English) as my original source, and am unfamiliar with Go Seigen's commentary on the game. (I don't yet see that he participated with Ohira on his book, though I haven't read it all yet, so I may have missed a notation).

Dosaku's Masterpiece was a 2 stone Castle game played between a member of the Yasui house, Shunchi and the head of the Honinbo house, Dosaku. It was played on the Japanese date of Tenna 3-XI-19 which most people read as Nov 19th 1683. But it should actually be read as Jan 5th 1684.

Naturally, GoGod has it listed as 1684-01-05, as does the Japanese site Momoyama. But most English language sources that I could find use the November date, including Ohira's Appreciating Famous Games that John Fairbairn translated.

And even worse, Googling for "Dosaku's Masterpiece" will find many YouTube and other sources (such as Baduk Legends) with also the wrong name of Dosaku's opponent -- likely both a misspelling and confusion of Yasui Shunchi with the then head of the Yasui house, Yasui Sanchi.

As John Fairbairn says elsewhere on this forum, there's no such player as "Yusui Sanchi"

Dosaku's Masterpiece
2 stones: Yasui Shunchi
White: Honinbo Dosaku
Date: 5th Jan 1684
277 moves.
Black wins by 1 point.
Commentary adapted from commentaries by Ohira Shuzo and Go Seigen.

Click Here To Show Diagram Code: [go]$$W moves 1-10 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . 7 . . 8 . . . . . . . . . . . | $$ | . . 6 , . . . . . , . . . . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . 0 . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , a . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . 4 . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . X . . . . . , . . . . . , 1 . . | $$ | . . . . . 3 . . . . 5 . . . 2 9 . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

The ogeima used to be the standard response to the kogeima kakari against hoshi. (a few too many Japanese terms for my taste

)

is in the wrong direction

(variation for :b6:

)

is an old style move. These days the extension to a is preferred.

discuss...

RBerenguel · #2

This is the first game I played in my new board

Since I don't remember most of it, all comments and moves will feel anew.

I feel that white is developing very quickly all around the board. My gut feeling is that the space between 3 and 5 has to be exploited, but of course Dosaku is a masterful fighter and can get away with that... Probably.

For me :b8:

feels oddly out of place. Works neater with 10 in place, but... Doesn't :w9:

need to be answered? Isn't the hane-tiger mouth shape in that area just too strong (btw, why there are no coordinates in the board?

daal · #3

xed_over wrote:

Click Here To Show Diagram Code: [go]$$Wc The game $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . 7 . . 8 . . . . . . . . . . . | $$ | . . 6 , . . . . . , . . . . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . 4 . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . X . . . . . , . . . . . , 1 . . | $$ | . . . . . 3 . . . . 5 . . . 2 . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Click Here To Show Diagram Code: [go]$$Bc The variation $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . 1 . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . X . . . | $$ | . . 2 . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . 3 . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . X . . . . . , . . . . . , O . . | $$ | . . . . . O . . . . O . . . X . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

This pincer now works well with Black's formation at the bottom. However, the joseki following this move were not known in the 17th century.

But it's the same formation as was played in the game - just in the other direction - so this seems like an odd argument to justify B6.

daal · #4

RBerenguel wrote:

Doesn't

need to be answered? Isn't the hane-tiger mouth shape in that area just too strong

My 2 cents: B is outnumbered 3-1. Now is not a good time to start a fight there.

cyclops · #5

daal wrote:

But it's the same formation as was played in the game - just in the other direction - so this seems like an odd argument to justify B6.

It is the C7 stone that makes the difference. The proposed variant adds to efficiency of C7.

Bill Spight · #6

daal wrote:

xed_over wrote:

Click Here To Show Diagram Code: [go]$$Wc The game $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . 7 . . 8 . . . . . . . . . . . | $$ | . . 6 , . . . . . , . . . . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . 4 . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . X . . . . . , . . . . . , 1 . . | $$ | . . . . . 3 . . . . 5 . . . 2 . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Click Here To Show Diagram Code: [go]$$Bc The variation $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . 1 . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . X . . . | $$ | . . 2 . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . 3 . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . X . . . . . , . . . . . , O . . | $$ | . . . . . O . . . . O . . . X . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

This pincer now works well with Black's formation at the bottom. However, the joseki following this move were not known in the 17th century.

But it's the same formation as was played in the game - just in the other direction - so this seems like an odd argument to justify B6.

From the early 17th century:

Click Here To Show Diagram Code: [go]$$B Nakamura Doseki (W) - Yasui Santetsu $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . 3 . 2 . . . . | $$ | . . . , . . . . . , . . . . . , 1 . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , 4 . . | $$ | . . . . . . . . . . . 6 . . 5 . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Note

. What do you mean this joseki was unknown in the 17th century?

Sure, they tenukied a lot, but that is not the same thing.

xed_over · #7

Bill Spight wrote:

Note

. What do you mean this joseki was unknown in the 17th century?

Sure, they tenukied a lot, but that is not the same thing.

hehe... its not my comment... its from the book

perhaps Ohira should have said relatively unknown

xed_over · #8

RBerenguel wrote:

My gut feeling is that the space between 3 and 5 has to be exploited, but of course Dosaku is a masterful fighter and can get away with that... Probably.

Ohira says that Black 4 could have pincered :w3:

@ k3, but then White would probably play 5 at c6.

Otherwise, I think the timing is off for Black to play in there now. It would be to White's advantage for Black to start a bunch of separate fights.

Loons · #9

Quote:

Click Here To Show Diagram Code: [go]$$Bc The variation $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . 1 . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . X . . . | $$ | . . 2 . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . 3 . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . X . . . . . , . . . . . , O . . | $$ | . . . . . O . . . . O . . . X . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

This pincer now works well with Black's formation at the bottom. However, the joseki following this move were not known in the 17th century.

I feel like this is a good case for actively using C7: I find I often make the mistake of just playing C6ish passively because white approached, instead of actively planning around it.

xed_over · **#10**

I personally don't have any answers for Loons questions

anyway, the game continues...

Click Here To Show Diagram Code: [go]$$Wm11 moves 11-20 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . O . . X . . . . . . . . . . . | $$ | . . X , . . . . . , . . . . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . 6 . . . . . . . . . . . . . . . . | $$ | . 5 4 . . a . . . . . . . . . . . . . | $$ | . . 3 X . b . . . , . . . . . , O . . | $$ | . . 1 2 0 O . . . . O . . . X O . . . | $$ | . . 9 7 8 . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

is a suspect move

(variation for :b14:

)

Click Here To Show Diagram Code: [go]$$B variation for $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . O . . X . . . . . . . . . . . | $$ | . . X , . . . . . , . . . . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . b . . . . . . . . . . . . . | $$ | . . 3 . . 9 a . . . . . . . . . . . . | $$ | . . 2 1 . 8 0 . . . . . . . . . . . . | $$ | . . O X . . . . . , . . . . . , O . . | $$ | . . O X 7 O . . . . O . . . X O . . . | $$ | . . 6 4 5 . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

if White hanes at a, pulling back at b is sufficient.

Click Here To Show Diagram Code: [go]$$Bm11 variation for cont. $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . O . . X . . . . . . . . . . . | $$ | . . X , . . . . . , . . . . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . 3 . . . . . . . . . . . . . . | $$ | . . X . . X 1 2 . . . . . . . . . . . | $$ | . . O X . O O . . . . . . . . . . . . | $$ | . . O X . . . . . , . . . . . , O . . | $$ | . . O X X O . . . . O . . . X O . . . | $$ | . . O O X . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Black gets better shape than he got in the actual game.

This result is bad for Black. White can expose his weak points with a or b.

RBerenguel · **#11**

Can't wait to see what white does now

Celebrir · **#12**

daal wrote:

RBerenguel wrote:

Doesn't

need to be answered? Isn't the hane-tiger mouth shape in that area just too strong

My 2 cents: B is outnumbered 3-1. Now is not a good time to start a fight there.

My idea is that if W plays there another time, he already invested 4 stones into the bottom right at this early point, which is 3 more than B. Taking into account that B started with 2 handicap, B would have 4-5 stones more on the rest of the board. Besides there would be still aji in :b2:

and/or sabaki possibilities with attaching to :w5:

xed_over · **#13**

I'm always playing :b4:

when I shouldn't.
And my opponents always seem to be able to successfully cut me at a right away (often instead of 5, or maybe later, I can't remember).

Click Here To Show Diagram Code: [go]$$W corner joseki should be at a $$ | . . . , . . . . . , $$ | . . . . . . . . . . $$ | . . . . . . . . . . $$ | . . # . . . . . . . $$ | . . 6 . . . . . . . $$ | . 5 4 a . . . . . . $$ | . . 3 X . . . . . , $$ | . . 1 2 0 O . . . . $$ | . . 9 7 8 . . . . . $$ | . . . . . . . . . . $$ ----------------------[/go]

But when the tables are turned and I'm playing white and try to cut, I still never can get it quite right and again find myself on the losing end of the deal.

Maybe its the presence of the marked stone (in the game) that makes the difference here. Without that stone, what should white do when black plays :b4:

? Cut right away, or wait for a later opportunity to take advantage of the weakness?

Celebrir · **#14**

Generally the cut shouldn't be possible here:

Click Here To Show Diagram Code: [go]$$W W is catched. $$ | . . . , . . . . . , $$ | . . . . . . . . . . $$ | . . . 6 . . . . . . $$ | . . B 5 4 . . . . . $$ | . . X 3 7 8 . . . . $$ | . O X 1 2 . . . . . $$ | . . O X . . . . . , $$ | . . O X X O . . . . $$ | . . O O X . . . . . $$ | . . . . . . . . . . $$ ----------------------[/go]

Cut be that you become cut at this joseki:

Click Here To Show Diagram Code: [go]$$W dangerous cut $$ | . . . , . . . . . , $$ | . . . . . . . . . . $$ | . . . . . . . . . . $$ | . . . . . . . . . . $$ | . . . . . . . . . . $$ | . . 6 9 . . . . . . $$ | . . 5 X . . . . . , $$ | . . 3 4 . 1 . 2 . . $$ | . . 7 8 . . . . . . $$ | . . . . . . . . . . $$ ----------------------[/go]

This cut is really dangerous. B should have played at :w9:

Note that this is a completly different context: B played a pincer instead of a ogeima here.

xed_over · **#15**

let's see... where did I leave off? moves 21-30 ...

Click Here To Show Diagram Code: [go]$$Wm21 moves 21-30 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . O . 9 X . . . . . . . . . . . | $$ | . . X , . . . 7 8 , . . . . . X . . . | $$ | . . . 2 . . . 0 . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . 1 . . . . . . . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . 3 , . . . . . , . . . . . , 6 . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . O X . . . . . . . . . . . . . . . . | $$ | . . O X . 4 . . . , . . . . 5 , O . . | $$ | . . O X X O . . . . O . . . X O . . . | $$ | . . O O X . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

is effectively sente

Black cannot allow White to follow up at 24

:b26:

is too small-scale and low

(variation for :b26:

)

is an aggressive move

(variation for :w27:

)

(variation for :b28:

)

Click Here To Show Diagram Code: [go]$$B variation for $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . O . 1 X . . . . . . . . . . . | $$ | . . X , . . . O . , . . . . . X . . . | $$ | . . . X 2 . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O . . . . . . . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O , . . . . . , . . . . . , X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . O X . . . . . . . . . . . . . . . . | $$ | . . O X . X . . . , . . . . O , O . . | $$ | . . O X X O . . . . O . . . X O . . . | $$ | . . O O X . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

If Black plays nobi, White will dodge lightly at 2

(another variation for :b28:

black continues at (a) or (b) below )

Click Here To Show Diagram Code: [go]$$B black must not play this hane $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . O . 2 X a . . . . . . . . . . | $$ | . . X , . . 1 O . , . . . . . X . . . | $$ | . . . X . . b . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O . . . . . . . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O , . . . . . , . . . . . , X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . O X . . . . . . . . . . . . . . . . | $$ | . . O X . X . . . , . . . . O , O . . | $$ | . . O X X O . . . . O . . . X O . . . | $$ | . . O O X . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

(black continuation at (a) above )

Click Here To Show Diagram Code: [go]$$B black hane cont (a) $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . O 9 O X 1 . . . . . . . . . . | $$ | . . X , 4 3 X O . , . . . . . X . . . | $$ | . . . X 6 5 2 . . . . . . . . . . . . | $$ | . . . . 8 7 . . . . . . . . . . . . . | $$ | . . O . . 0 . . . . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O , . . . . . , . . . . . , X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . O X . . . . . . . . . . . . . . . . | $$ | . . O X . X . . . , . . . . O , O . . | $$ | . . O X X O . . . . O . . . X O . . . | $$ | . . O O X . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

White rips the black position apart

(black continuation at (b) )

Click Here To Show Diagram Code: [go]$$B black hane cont (b) $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . 4 3 5 . . . . . . . . . . | $$ | . . . . O . O X 2 6 a . . . . . . . . | $$ | . . X , . . X O 7 9 . . . . . X . . . | $$ | . . . X . b 1 8 . . . . . . . . . . . | $$ | . . . . . . 0 . . . . . . . . . . . . | $$ | . . O . . . . . . . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O , . . . . . , . . . . . , X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . O X . . . . . . . . . . . . . . . . | $$ | . . O X . X . . . , . . . . O , O . . | $$ | . . O X X O . . . . O . . . X O . . . | $$ | . . O O X . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

(

at (a),

at (b)) This exchange clearly favors White

is slightly dubious

(variation for :b30:

)

feel free to discuss... more to come.

xed_over · **#16**

moves 31-40 ...

Click Here To Show Diagram Code: [go]$$Wm31 moves 31-40 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . 4 O . O X 2 . . . . . . . . . . | $$ | . . X , . . 1 O X , 9 . . . . X . . . | $$ | . . . X . . . X 5 6 . . . . . . . . . | $$ | . . . . 3 . . . 7 8 . . . . . . . . . | $$ | . . O . . . . . 0 . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O , . . . . . , . . . . . , X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . O X . . . . . . . . . . . . . . . . | $$ | . . O X . X . . . , . . . . O , O . . | $$ | . . O X X O . . . . O . . . X O . . . | $$ | . . O O X . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

(variation for :w33:

)

Black has to sacrifice H15 stone

(variation for :b36:

)

is an excellent countermeasure to Black's sequence, and is the main reason why H15 would have been better left unplayed.

(variation for :w39:

)

moves 41-50 ...

Click Here To Show Diagram Code: [go]$$Wm41 moves 41-50 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . X O . O X X . 7 6 . 3 4 . . . . | $$ | . . X , . . O O X 2 O 8 . 5 . X . . . | $$ | . . . X . . . X O X . . . . . 9 0 . . | $$ | . . . . O . . 1 O X . . . . . . . . . | $$ | . . O . . . . . X . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O , . . . . . , . . . . . , X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . O X . . . . . . . . . . . . . . . . | $$ | . . O X . X . . . , . . . . O , O . . | $$ | . . O X X O . . . . O . . . X O . . . | $$ | . . O O X . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

is an attempt to settle White quickly.

(variation for :w43:

)

Click Here To Show Diagram Code: [go]$$W variation for $$ --------------------------------------- $$ | . . . . . . . . . . . . . . 8 . . . . | $$ | . . . . . . . . . . . . . 6 3 9 5 . . | $$ | . . . X O . O X X . . . . . 2 1 . . . | $$ | . . X , . . O O X X O . . . 4 X 7 . . | $$ | . . . X . . . X O X . . . . . . 0 . . | $$ | . . . . O . . O O X . . . . . . . . . | $$ | . . O . . . . . X . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O , . . . . . , . . . . . , X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . |[/go]

looks attractive, but would be inadvisable.

(variation for :w43:

cont)

Click Here To Show Diagram Code: [go]$$Wm11 variation for cont $$ --------------------------------------- $$ | . . . . . . . . . . . . . . X . . . . | $$ | . . . . . . . . . . . . . X O O O . . | $$ | . . . X O . O X X . . . 6 . X O 3 5 . | $$ | . . X , . . O O X X O . . . X X O 2 . | $$ | . . . X . . . X O X . . . . . . X 1 . | $$ | . . . . O . . O O X . . . . . . 4 a . | $$ | . . O . . . . . X . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O , . . . . . , . . . . . , X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . |[/go]

Because Black's outside position is too good to allow.

:b4:

atari at a would be a tragic blunder.

(variation for atari at a)

Click Here To Show Diagram Code: [go]$$Wm11 variation for atari at a $$ --------------------------------------- $$ | . . . . . . . . . . . . . . X . . . . | $$ | . . . . . . . . . . . . 8 X O O O . . | $$ | . . . X O . O X X . . 9 . 7 X O O . . | $$ | . . X , . . O O X X O . . . X X O X . | $$ | . . . X . . . X O X . . . . . 5 X O 6 | $$ | . . . . O . . O O X . . . . . . . 4 . | $$ | . . O . . . . . X . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O , . . . . . , . . . . . , X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . |[/go]

Click Here To Show Diagram Code: [go]$$ black's tragic blunder $$ --------------------------------------- $$ | . . . . . . . . . . . . . . Z . . . . | $$ | . . . . . . . . . . . . Z Z O O O . . | $$ | . . . X O . O X X . . O . O Y O O . . | $$ | . . X , . . O O X X O . . . Y Y O X . | $$ | . . . X . . . X O X . . . . . O X . X | $$ | . . . . O . . O O X . . . . . . . X . | $$ | . . O . . . . . X . . . . . . . X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O , . . . . . , . . . . . , X . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . |[/go]

Black cannot now avoid losing one of the marked groups.

hummm... there's a bug with adding coordinates to the board and specifying move numbers with white moving first.

Dosaku's Masterpiece - study

Who is online