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 Post subject: Re: Shapes to remember (SDK level)
Post #61 Posted: Sun Dec 13, 2020 4:03 am 
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I played one game on Tygem this morning, which got me promoted to 1d.

Position #34, Black to play in the lower-right quadrant. Several good moves are possible, but I thought I would record a sequence shown by Katago whose idea is not (yet) natural to me.


Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . . . . |
$$ | . . X , . . . . . O . . . . . X . . . |
$$ | . . X O O . . . . . . . . . . . . . . |
$$ | . . . X O . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . X X X . |
$$ | . . . . . . . . . . . . . . O X O O . |
$$ | . . . . . . . . . . . . . . O O X X . |
$$ | . . . . . . . . . . . . . . . . O X . |
$$ | . . . , . . . . . , . . . . . O . O . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Click Here To Show Diagram Code
[go]$$Bc Possible answer
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . . . . |
$$ | . . X , . . . . . O . . . . . X . . . |
$$ | . . X O O . . . . . . . . . . . . . . |
$$ | . . . X O . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . X X X . |
$$ | . . . . . . . . . . . . . . O X O O . |
$$ | . . . . . . . . . . . . . . O O X X . |
$$ | . . . . . . . . . . . . . . . . O X . |
$$ | . . . , . . . . . , . . . . . O 2 O . |
$$ | . . . X . . . . . . 5 . . . . 4 1 . . |
$$ | . . . . . . . . . . . . . 3 . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Alternatively, Black may play :b3: directly.

Click Here To Show Diagram Code
[go]$$Bc Possible answer
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . . . . |
$$ | . . X , . . . . . O . . . . . X . . . |
$$ | . . X O O . . . . . . . . . . . . . . |
$$ | . . . X O . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . X X X . |
$$ | . . . . . . . . . . . . . . O X O O . |
$$ | . . . . . . . . . . . . . . O O X X . |
$$ | . . . . . . . . . . . . . . . . O X . |
$$ | . . . , . . . . . , . . . . . O . O . |
$$ | . . . X . . . . . . 3 . . . . 2 a . . |
$$ | . . . . . . . . . . . . . 1 . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


The idea is the same, :b1: forces :w2: because it threatens "a".
Not sure why Katago slightly prefers the first sequence, though.

Of course, many other good moves are possible:

Click Here To Show Diagram Code
[go]$$Bc Other possible moves
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . . . . a b . . . . . |
$$ | . . X , . . . . . O . . . . . X . . . |
$$ | . . X O O . . . . . . . . . . . . . . |
$$ | . . . X O . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . X X X . |
$$ | . . . . . . . . . . . . . . O X O O . |
$$ | . . e f . . . . . . . . . . O O X X . |
$$ | . . c d . . . . . . . . . . . . O X . |
$$ | . . . , . . . . . , . . . . . O . O . |
$$ | . . . X . . . . . g h . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

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 Post subject: Re: Shapes to remember (SDK level)
Post #62 Posted: Thu Jan 14, 2021 4:12 am 
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Position #35, White to play.

Click Here To Show Diagram Code
[go]$$Wc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . O . . . . . . . . . X O . . |
$$ | . . . O . O O O X X . . . . . X O . . |
$$ | . . X O X O X O . . . . . . . . X O . |
$$ | . O O O X X X O X X O . . . . . X O . |
$$ | . . X X . . . X O O X X . . . . X O . |
$$ | . . . . . . . X . O O O X X . . X . . |
$$ | . . . . . . . . . . . O O O X . . . . |
$$ | . . . , X . . . X X O O X X . X . . . |
$$ | . . . . . X . X . O O X X . . . . . . |
$$ | . . . O . O O O . O O O X . . . . . . |
$$ | . . . . . . . . O X . O X . . . . . . |
$$ | . . . . . . . O X . X O X . . . . . . |
$$ | . . . . . O . X X . X X . . . X . . . |
$$ | . . . O . . . . . O . . . X . , X . . |
$$ | . . . . . . . . . . . . O . . O O . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Click Here To Show Diagram Code
[go]$$Wc Possible answer
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . O . . . . . . . . . X O . . |
$$ | . . . O . O O O X X . . . . . X O . . |
$$ | . . X O X O X O . . 3 . . . . . X O . |
$$ | . O O O X X X O X X O 2 . . . . X O . |
$$ | . . X X . . . X O O X X 1 . . . X O . |
$$ | . . . . . . . X . O O O X X . . X . . |
$$ | . . . . . . . . . . . O O O X . . . . |
$$ | . . . , X . . . X X O O X X . X . . . |
$$ | . . . . . X . X . O O X X . . . . . . |
$$ | . . . O . O O O . O O O X . . . . . . |
$$ | . . . . . . . . O X . O X . . . . . . |
$$ | . . . . . . . O X . X O X . . . . . . |
$$ | . . . . . O . X X . X X . . . X . . . |
$$ | . . . O . . . . . O . . . X . , X . . |
$$ | . . . . . . . . . . . . O . . O O . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


The group :w3: separates two black groups. White can try to kill one of them. The continuation is not easy to read but anyway White has nothing to lose, since everything happens in Black's area.

Other moves instead of :w1:, like L15 or M15, are also possible, with the same idea.

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 Post subject: Re: Shapes to remember (SDK level)
Post #63 Posted: Sat Jan 16, 2021 2:32 pm 
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This one shouldn't be hard.

Position #36, White to play.

Click Here To Show Diagram Code
[go]$$Wc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . O . . . . . . . . . . . . . |
$$ | . X . O . . . . . , . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . X . . . . . . . . X . . . X X . |
$$ | . . X , . X . X . , . . . . X X X O . |
$$ | . . . . O O . O . . . . O O . O O O . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Answer
Click Here To Show Diagram Code
[go]$$Wc answer
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . O . . . . . . . . . . . . . |
$$ | . X . O . . . . . , . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . X 2 . . . . . . . X . . . X X . |
$$ | . . X , 1 X 3 X . , . . . . X X X O . |
$$ | . . . . O O . O . . . . O O . O O O . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Click Here To Show Diagram Code
[go]$$Wc If Black pushes instead of blocking
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . O . . . . . . . . . . . . . |
$$ | . X . O . . . . . , . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . X 5 . . . . . . . X . . . X X . |
$$ | . . X , 1 X 4 X . , . . . . X X X O . |
$$ | . . . . O O 2 O . . . . O O . O O O . |
$$ | . . . . . . 3 6 . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


White's shape is cut bur so is Black's, and White has sente.

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 Post subject: Re: Shapes to remember (SDK level)
Post #64 Posted: Sun Jan 24, 2021 4:39 am 
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Position #37, Black to play.

Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . X O . O O . . |
$$ | . . X , X . . . . , . X . X . X X . . |
$$ | . . . . . . . . . . . . X X . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . O . , . . . . . , . . . . . , X . . |
$$ | . X O O . . . . O O O . . . . . . X . |
$$ | X . X . O . . . X X O X . . X X X O . |
$$ | . X . . . O . . X O X X O . O X O . O |
$$ | . . . X . . . O O O . . O . O O . O . |
$$ | . . X . . . . . X X X X X X O . O . . |
$$ | . . X O . O X . X O O O X . X O O . . |
$$ | . O O . . O . X O . . . O . X . . . . |
$$ | . . . . . . . X O . O . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Answer:

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

Black forces White to live in gote, and is now almost alive.

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 Post subject: Re: Shapes to remember (SDK level)
Post #65 Posted: Sun Jan 24, 2021 6:23 am 
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jlt wrote:
Position #37, Black to play.

Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . X O . O O . . |
$$ | . . X , X . . . . , . X . X . X X . . |
$$ | . . . . . . . . . . . . X X . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . O . , . . . . . , . . . . . , X . . |
$$ | . X O O . . . . O O O . . . . . . X . |
$$ | X . X . O . . . X X O X . . X X X O . |
$$ | . X . . . O . . X O X X O . O X O . O |
$$ | . . . X . . . O O O . . O . O O . O . |
$$ | . . X . . . . . X X X X X X O . O . . |
$$ | . . X O . O X . X O O O X . X O O . . |
$$ | . O O . . O . X O . . . O . X . . . . |
$$ | . . . . . . . X O . O . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Answer:

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

Black forces White to live in gote, and is now almost alive.

Should black even play at 9? I think black might want to keep it as a ko threat. Also, white's response at 10 weakens black's eye shape.

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 Post subject: Re: Shapes to remember (SDK level)
Post #66 Posted: Sun Jan 24, 2021 8:24 am 
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@gennan: you are right, :b9: should be played later in the game, the local sequence can stop at :w8:.

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Post #67 Posted: Tue Jan 26, 2021 9:13 am 
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Position #38, Black to play.

Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . X . |
$$ | . O O X . X . . . . . . X O . . X . X |
$$ | . . . O X . . . . X . X O X . X O X . |
$$ | . . . O . . . . . . . . O . . X O O . |
$$ | . . O . . . . . . . . O . O X X O . . |
$$ | . . . . . . . . . . . . . . X O X O . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . . O . . |
$$ | . . X O . . . . . , . . . X . , . . . |
$$ | . . X O . . . . O . X . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Answer:

Click Here To Show Diagram Code
[go]$$Bc Answer
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . 1 5 . . . X . |
$$ | . O O X . X . . . . . . X O 3 . X . X |
$$ | . . . O X . . . . X . X O X 2 X O X . |
$$ | . . . O . . . . . . . . O 4 . X O O . |
$$ | . . O . . . . . . . . O . O X X O . . |
$$ | . . . . . . . . . . . . . . X O X O . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . . O . . |
$$ | . . X O . . . . . , . . . X . , . . . |
$$ | . . X O . . . . O . X . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

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