Shapes to remember (SDK level)

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EricBackus
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Re: Shapes to remember (SDK level)

Post by EricBackus »

jlt wrote:From my kyu perspective, White would just sacrifice two stones, which is not so big
Yea, it was just bad reading on my part.
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jlt
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Re: Shapes to remember (SDK level)

Post by jlt »

Position #71, White to play.
Click Here To Show Diagram Code
[go]$$Wc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . O X . . . . . X . O . . . . . |
$$ | . O . O . X . X X X . X . O . O O O . |
$$ | . O . O . O O O O O O O O X X X X X . |
$$ | X O . O . . . X X X . O X . . . . . . |
$$ | . X O O . X . X O X X O . X . . . X . |
$$ | . . X . . . . O O . X O O X . . O X . |
$$ | . X . O X . X . O . X X X O O . . O . |
$$ | . X X O O . . X O . O O O X . O . . . |
$$ | . O O X O X O O O , . . . X . , . . . |
$$ | . X . X . O . . . . . . . . . . . . . |
$$ | . . X . X . . . . . . . . . X . X . . |
$$ | . . . . . . X . . . . . . . . . . X X |
$$ | . . . . . . . . . . . . . . . O O O X |
$$ | . . . . . . . . . . X . . . . . X O O |
$$ | . . . X . . . . . , . . . . O , . . . |
$$ | . . . . . X . . . . X . O . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
EricBackus
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Re: Shapes to remember (SDK level)

Post by EricBackus »

Originally I thought of P9, but I don't think it works. So instead, maybe G14 to reduce the liberties of the black dragon in the middle. However, even assuming the dragon dies, I worry that black lower left is just too big.
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jlt
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Re: Shapes to remember (SDK level)

Post by jlt »

Hint: the last move was
S14
Continue in the area.

Answer:
Click Here To Show Diagram Code
[go]$$Wc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . O X . . . . . X . O . . . . . |
$$ | . O . O . X . X X X . X . O . O O O . |
$$ | . O . O . O O O O O O O O X X X X X . |
$$ | X O . O . . . X X X . O X . . . . . . |
$$ | . X O O . X . X O X X O . X . . . X . |
$$ | . . X . . . . O O . X O O X . . O X . |
$$ | . X . O X . X . O . X X X O O . . O . |
$$ | . X X O O . . X O . O O O X . O . . . |
$$ | . O O X O X O O O , . . . X . , . 1 . |
$$ | . X . X . O . . . . . . . . . . . . . |
$$ | . . X . X . . . . . . . . . X . X . . |
$$ | . . . . . . X . . . . . . . . . . X X |
$$ | . . . . . . . . . . . . . . . O O O X |
$$ | . . . . . . . . . . X . . . . . X O O |
$$ | . . . X . . . . . , . . . . O , . . . |
$$ | . . . . . X . . . . X . O . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
The point is to protect against the clamp S11 while gaining liberties in order to win the capturing race against H15. THe black group S16 will need to add defensive moves.
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jlt
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Re: Shapes to remember (SDK level)

Post by jlt »

Position #72, White to play a good endgame move.
Click Here To Show Diagram Code
[go]$$Wc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . O . . . . . . . . . X O O O . |
$$ | . X O . . . X . . . . X X . X O X X . |
$$ | . X X O O . . X . X X O X . . O . . . |
$$ | . . . . . . O O O O O O O O . O X . . |
$$ | . . . . . . . O X X X O . . . . X . . |
$$ | . . X . O . . O X . . X O . X . . . . |
$$ | . . . X . . . X . X X X . X . . . . . |
$$ | . . . X O . O O X X . . . X O . . . . |
$$ | . . X O O . . . . , . X X O . , X . . |
$$ | . X X . . X . X . X . O O . O O X . . |
$$ | . O X O O X . . . . . . . . O X X . . |
$$ | . O X O X X . X . X O . . . O X O . . |
$$ | . . O O X . O . . . O . . . . O X X . |
$$ | . . . . . . . . X X O . . . . O . . . |
$$ | . . O , X X O O . O . . . . . O X . . |
$$ | . O X X X O O . . . O . . X O O X . . |
$$ | . O . . . X O O . . . . . . O X X . . |
$$ | . . . . X . X . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
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Knotwilg
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Re: Shapes to remember (SDK level)

Post by Knotwilg »

Click Here To Show Diagram Code
[go]$$Wc Black's problem
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . O . . . . . . . . . X O O O . |
$$ | . X O . . . X . . . . X X . X O X X . |
$$ | . X X O O . . X . X X O X . . O 7 8 . |
$$ | . . . . . . O O O O O O O O . O X 0 . |
$$ | . . . . . . . O X X X O . . . 3 X 6 9 |
$$ | . . X . O . . O X . . X O . X 4 1 5 . |
$$ | . . . X . . . X . X X X . X . 2 . . . |
$$ | . . . X O . O O X X . . . X O . . . . |
$$ | . . X O O . . . . , . X X O . , X . . |
$$ | . X X . . X . X . X . O O . O O X . . |
$$ | . O X O O X . . . . . . . . O X X . . |
$$ | . O X O X X . X . X O . . . O X O . . |
$$ | . . O O X . O . . . O . . . . O X X . |
$$ | . . . . . . . . X X O . . . . O . . . |
$$ | . . O , X X O O . O . . . . . O X . . |
$$ | . O X X X O O . . . O . . X O O X . . |
$$ | . O . . . X O O . . . . . . O X X . . |
$$ | . . . . X . X . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
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jlt
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Re: Shapes to remember (SDK level)

Post by jlt »

Interesting but Black could respond with :b2: at :b4:.
And in fact Katago was thinking about an endgame move in the upper left quadrant.
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Re: Shapes to remember (SDK level)

Post by EricBackus »

Click Here To Show Diagram Code
[go]$$Wc This ko looks tough for black?
$$ ---------------------------------------
$$ | . . . . . . . 5 . . . . . . . . . . . |
$$ | . . O . O 6 3 4 1 . . . . . X O O O . |
$$ | . X O . . . X . 2 . . X X . X O X X . |
$$ | . X X O O . . X . X X O X . . O . . . |
$$ | . . . . . . O O O O O O O O . O X . . |
$$ | . . . . . . . O X X X O . . . . X . . |
$$ | . . X . O . . O X . . X O . X . . . . |
$$ | . . . X . . . X . X X X . X . . . . . |
$$ | . . . X O . O O X X . . . X O . . . . |
$$ | . . X O O . . . . , . X X O . , X . . |
$$ | . X X . . X . X . X . O O . O O X . . |
$$ | . O X O O X . . . . . . . . O X X . . |
$$ | . O X O X X . X . X O . . . O X O . . |
$$ | . . O O X . O . . . O . . . . O X X . |
$$ | . . . . . . . . X X O . . . . O . . . |
$$ | . . O , X X O O . O . . . . . O X . . |
$$ | . O X X X O O . . . O . . X O O X . . |
$$ | . O . . . X O O . . . . . . O X X . . |
$$ | . . . . X . X . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Click Here To Show Diagram Code
[go]$$Wc Or just this?
$$ ---------------------------------------
$$ | . . . . . . . 3 . . . . . . . . . . . |
$$ | . . O . O . . . 1 . . . . . X O O O . |
$$ | . X O . . . X . 2 . . X X . X O X X . |
$$ | . X X O O . . X . X X O X . . O . . . |
$$ | . . . . . . O O O O O O O O . O X . . |
$$ | . . . . . . . O X X X O . . . . X . . |
$$ | . . X . O . . O X . . X O . X . . . . |
$$ | . . . X . . . X . X X X . X . . . . . |
$$ | . . . X O . O O X X . . . X O . . . . |
$$ | . . X O O . . . . , . X X O . , X . . |
$$ | . X X . . X . X . X . O O . O O X . . |
$$ | . O X O O X . . . . . . . . O X X . . |
$$ | . O X O X X . X . X O . . . O X O . . |
$$ | . . O O X . O . . . O . . . . O X X . |
$$ | . . . . . . . . X X O . . . . O . . . |
$$ | . . O , X X O O . O . . . . . O X . . |
$$ | . O X X X O O . . . O . . X O O X . . |
$$ | . O . . . X O O . . . . . . O X X . . |
$$ | . . . . X . X . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
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jlt
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Re: Shapes to remember (SDK level)

Post by jlt »

Yes your proposition is a good move
Possible local continuation
Click Here To Show Diagram Code
[go]$$Wc White to play
$$ ---------------------------------------
$$ | . . . . . . 5 3 . 7 . . . . . . . . . |
$$ | . . O . O . . 4 1 6 8 . . . X O O O . |
$$ | . X O . . . X 2 . . . X X . X O X X . |
$$ | . X X O O . . X . X X O X . . O . . . |
$$ | . . . . . . O O O O O O O O . O X . . |
$$ | . . . . . . . O X X X O . . . . X . . |
$$ | . . X . O . . O X . . X O . X . . . . |
$$ | . . . X . . . X . X X X . X . . . . . |
$$ | . . . X O . O O X X . . . X O . . . . |
$$ | . . X O O . . . . , . X X O . , X . . |
$$ | . X X . . X . X . X . O O . O O X . . |
$$ | . O X O O X . . . . . . . . O X X . . |
$$ | . O X O X X . X . X O . . . O X O . . |
$$ | . . O O X . O . . . O . . . . O X X . |
$$ | . . . . . . . . X X O . . . . O . . . |
$$ | . . O , X X O O . O . . . . . O X . . |
$$ | . O X X X O O . . . O . . X O O X . . |
$$ | . O . . . X O O . . . . . . O X X . . |
$$ | . . . . X . X . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Katago hesitated with another move, not sure which one is best.
Click Here To Show Diagram Code
[go]$$Wc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . O . 3 1 . 4 . . . . X O O O . |
$$ | . X O . . . X . . . . X X . X O X X . |
$$ | . X X O O . . X 2 X X O X . . O . . . |
$$ | . . . . . . O O O O O O O O . O X . . |
$$ | . . . . . . . O X X X O . . . . X . . |
$$ | . . X . O . . O X . . X O . X . . . . |
$$ | . . . X . . . X . X X X . X . . . . . |
$$ | . . . X O . O O X X . . . X O . . . . |
$$ | . . X O O . . . . , . X X O . , X . . |
$$ | . X X . . X . X . X . O O . O O X . . |
$$ | . O X O O X . . . . . . . . O X X . . |
$$ | . O X O X X . X . X O . . . O X O . . |
$$ | . . O O X . O . . . O . . . . O X X . |
$$ | . . . . . . . . X X O . . . . O . . . |
$$ | . . O , X X O O . O . . . . . O X . . |
$$ | . O X X X O O . . . O . . X O O X . . |
$$ | . O . . . X O O . . . . . . O X X . . |
$$ | . . . . X . X . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
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jlt
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Re: Shapes to remember (SDK level)

Post by jlt »

Position #73: White to respond to the cross-cut and find a good way to escape.
Click Here To Show Diagram Code
[go]$$Wc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . O O O . . |
$$ | . . X O . . . . . . . . . O X O X X . |
$$ | . . X O . . . . . O . . . O X X . . . |
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . X O . . . . . . . . . . . . . X . . |
$$ | . X . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . X . O . . . . |
$$ | . . . , . . . . . , . . . . . O . . . |
$$ | . . X . . . . . . . . X . X X O . . . |
$$ | . . . . . . . . . . . . . . O X . . . |
$$ | . . . . . . . . . . X O . . O X . . . |
$$ | . . . . . . . . . . O B . . O X . . . |
$$ | . . X . . . . . . . . . . . O X . . . |
$$ | . . . , O . . . . , . X . . O O X . . |
$$ | . . . O . . . X . . . . . X . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
AI's answer:
Click Here To Show Diagram Code
[go]$$Wc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . O O O . . |
$$ | . . X O . . . . . . . . . O X O X X . |
$$ | . . X O . . . . . O . . . O X X . . . |
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . X O . . . . . . . . . . . . . X . . |
$$ | . X . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . X . O . . . . |
$$ | . . . , . . . . . , . . . . . O . . . |
$$ | . . X . . . . . . . . X . X X O . . . |
$$ | . . . . . . . . . . 5 7 . . O X . . . |
$$ | . . . . . . . . . 6 X O 3 . O X . . . |
$$ | . . . . . . . . . . O X 2 . O X . . . |
$$ | . . X . . . . . . . . 1 4 . O X . . . |
$$ | . . . , O . . . . , . X . . O O X . . |
$$ | . . . O . . . X . . . . . X . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
This gives Black a few points on the bottom but allows White to escape and attack the central group.
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jlt
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Re: Shapes to remember (SDK level)

Post by jlt »

Position #74, easy move missed again.
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . X O . O . |
$$ | . . . O . . . . O . . X . X . X O . . |
$$ | . . O , O . . . . , O X . . . X O O . |
$$ | . . X X O . . . . . O X . . . X O . O |
$$ | . . . . . . . . X X X X O . O X X O O |
$$ | . . . . . . . . . O O O . . . X . X O |
$$ | . . X . X . . . . . . . . . . . . X O |
$$ | . . . . . . . . . . . O . . . . . X X |
$$ | . . . , . . . . . W O X X . . , . . . |
$$ | . . O . . . . . . . X O X X . . . . . |
$$ | . . . . . . . . . . . O O X . . X . . |
$$ | . . . . . . . . . . . . X O X . . . . |
$$ | . . O . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . O X X . . |
$$ | . O . X . . . . . , . . . . O , O . . |
$$ | . . X . . . X . . X . O . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Answer:
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . X O . O . |
$$ | . . . O . . . . O . . X . X . X O . . |
$$ | . . O , O . . . . , O X . . . X O O . |
$$ | . . X X O . . . . . O X . . . X O . O |
$$ | . . . . . . . . X X X X O . O X X O O |
$$ | . . . . . . . . . O O O . . . X . X O |
$$ | . . X . X . . . . . . . . . . . . X O |
$$ | . . . . . . . . . . . O . . . . . X X |
$$ | . . . , . . . . . O O X X . . , . . . |
$$ | . . O . . . . . . . X O X X . . . . . |
$$ | . . . . . . . . . . . O O X . . X . . |
$$ | . . . . . . . . . . 1 . X O X . . . . |
$$ | . . O . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . O X X . . |
$$ | . O . X . . . . . , . . . . O , O . . |
$$ | . . X . . . X . . X . O . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Squeeze White.
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jlt
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Re: Shapes to remember (SDK level)

Post by jlt »

Position #75, Black to play. Nothing fancy, but not at all on my radar.
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . W X . . . . . . . . . . . . . |
$$ | . . . O . . . . O , . . . . . X . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . . . . . . . . . . . . . O X . . |
$$ | . . O O O . . . . , . . . . . , X . . |
$$ | . . X X . . . . . . . . . X . X . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Answer
Click Here To Show Diagram Code
[go]$$Bc Answer
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . a b B . . . . . . . . . . . . |
$$ | . . . . O X . . . . . . . . . . . . . |
$$ | . . . O . . . . O , . . . . . X . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . . . . . . . . . . . . . O X . . |
$$ | . . O O O . . . . , . . . . . , X . . |
$$ | . . X X . . . . . . . . . X . X . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
The move has a followup at "a". It also makes the pincer of J16 more powerful than if Black had played the descent "b".
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jlt
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Re: Shapes to remember (SDK level)

Post by jlt »

Position #76, Black to play. Another simple shape I missed.
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X , . X . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . , X X X X . X O . . |
$$ | . . X X O O O O . . O O O O X . W . . |
$$ | . . . . X X X . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Answer:
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X , . X . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . , X X X X . X O . . |
$$ | . . X X O O O O . . O O O O X . O . . |
$$ | . . . . X X X . . . . . . . . 1 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
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Re: Shapes to remember (SDK level)

Post by jlt »

Position #77, Black to play.
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X X X X X O . . . . . . . . . . . . |
$$ | . X O O O . . . . , . . . . . X . . . |
$$ | . O O . . . O . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . X O . . . . . , . . . . . , . . . |
$$ | . . O O . . O . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X X X X X O . . . . . . . . . . . . |
$$ | . X O O O a 1 . . , . . . . . X . . . |
$$ | . O O . . . O . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . X O . . . . . , . . . . . , . . . |
$$ | . . O O . . O . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Earlier, White should have protected at a, so Black should ruin White's shape with :b1:. At this point Katago wants White to tenuki. Later, if for instance White ataris then here is a possible local continuation.
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X X X X X O . . . . . . . . . . . . |
$$ | . X O O O 3 1 2 . , . . . . . X . . . |
$$ | . O O . . 4 O 5 . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |[/go]
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Re: Shapes to remember (SDK level)

Post by jlt »

Position #78, Black to play. From the same correspondence game against gennan. At move 144 (position below) Katago says White was leading by 1.5. In the end White won by 16.5, increasing his advantage step by step between moves 144 and 286. Black missed several important points which appear in the following position.
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X O . . . X . . O X X O X . |
$$ | . X X X X X O . . X O X . . O X O X . |
$$ | . X O O O . . . O O O O O . . X O X . |
$$ | . O O . . . O . . X O X O . O X X O . |
$$ | . . X . . . . . . . O X O O X . X O . |
$$ | . . . . O . . O . O X X X X X X X O . |
$$ | . . . . . . X X O . O X O O X X X . . |
$$ | . . O O . X . . X O . O . . O . . . . |
$$ | . . . , . O X X . , O . . . . , X . . |
$$ | . . O O . X O X . O X O . . . . . . . |
$$ | . X X X X . . . . . X O . O . O O . . |
$$ | . O . . . O . . . . . X . . . X . . . |
$$ | . X X X . . . X . . X . . X . X O . . |
$$ | . O X O . . O . . X . . . . . X O . . |
$$ | . O X O . . . X X O . . . X O O X . . |
$$ | . . O O . . O O O . . O . . X X X . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
The first point is more complicated than it seems. Black should play :b1: in sente.
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X O . . . X . . O X X O X . |
$$ | . X X X X X O . . X O X . . O X O X . |
$$ | . X O O O 1 . . O O O O O . . X O X . |
$$ | c O O . . 2 O . . X O X O . O X X O . |
$$ | d a X b . . . . . . O X O O X . X O . |
$$ | . . . . O . . O . O X X X X X X X O . |
$$ | . . . . . . X X O . O X O O X X X . . |
$$ | . . O O . X . . X O . O . . O . . . . |
$$ | . . . , . O X X . , O . . . . , X . . |
$$ | . . O O . X O X . O X O . . . . . . . |
$$ | . X X X X . . . . . X O . O . O O . . |
$$ | . O . . . O . . . . . X . . . X . . . |[/go]
If White doesn't answer with :w2: then Black can play a. If White responds with c or d then Black b. The variations are a bit complicated but normally Black can threaten to capture white stones and then connect to a living group to save his three stones. So Katago prefers white to answer Black a with White b, and then Black can connect with c.

Then Black should play :b3: in sente. If White doesn't respond with :w4: then Black can play a.
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X O . . . X . . O X X O X . |
$$ | . X X X X X O . a X O X . . O X O X . |
$$ | . X O O O 1 3 4 O O O O O . . X O X . |
$$ | . O O . . 2 O . . X O X O . O X X O . |
$$ | . . X . . . . . . . O X O O X . X O . |
$$ | . . . . O . . O . O X X X X X X X O . |
$$ | . . . . . . X X O . O X O O X X X . . |
$$ | . . O O . X . . X O . O . . O . . . . |
$$ | . . . , . O X X . , O . . . . , X . . |
$$ | . . O O . X O X . O X O . . . . . . . |
$$ | . X X X X . . . . . X O . O . O O . . |
$$ | . O . . . O . . . . . X . . . X . . . |[/go]
Next comes this sequence:
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X O . . . X . . O X X O X . |
$$ | . X X X X X O . . X O X . . O X O X . |
$$ | . X O O O 1 3 4 O O O O O . . X O X . |
$$ | . O O . . 2 O . . X O X O . O X X W . |
$$ | . . X . . . . . . . O X O O X . X W . |
$$ | . . . . O . . O . O X X X X X X X W . |
$$ | . . . . . . X X O . O X O O X X X . . |
$$ | . . O O . X . . X O . O . . O . . a . |
$$ | . . . , . O X X . , O . . . . , X . . |
$$ | . . O O . X O X . O X O . . . . . 5 . |
$$ | . X X X X . . . . . X O . O . O O 6 . |
$$ | . O . . . O . . . . . X . . . X 7 b . |
$$ | . X X X . . . X . . X . . X . X O . . |
$$ | . O X O . . O . . X . . . . . X O . . |
$$ | . O X O . . . X X O . . . X O O X . . |
$$ | . . O O . . O O O . . O . . X X X . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
:b5: is very big because White playing there is sente (threatens to save the three marked stones). White responds with :w6: (if White plays elsewhere then Black :b7: and :w8: is at :w6: anyway). One reason why :w6: is big is that, besides reducing Black's corner, it threatens the reduction move a. So after a sequence starting with a, Black will close the corner with b.

Another worthwhile and simple sequence for Black later: close territory while pressing White down to the second line in sente.
Click Here To Show Diagram Code
[go]$$Bc
$$ | . X X X X . . . . . X O . O . O O O . |
$$ | . O . . . O . . . . . X . . . X X X . |
$$ | . X X X . . . X . . X . . X . X O . . |
$$ | . O X O . . O . . X . . . . . X O . . |
$$ | . O X O . . . X X O 3 7 . X O O X . . |
$$ | . . O O . . O O O 4 5 O 1 . X X X . . |
$$ | . . . . . . . . . . 6 8 2 O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
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