Life and death in an old handicap game

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xela
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Life and death in an old handicap game

Post by xela »

This is Iwamoto giving Francis Roads seven stones back in 1975. Black lost a big group at top left but nearly made up for it at the bottom. Here is the final nail in the coffin:

Click Here To Show Diagram Code
[go]$$Bc Position after move 147 (variation): Black to play $$ +---------------------------------------+ $$ | . . . . O X X . . . O . . . . . . . . | $$ | O O . O O X O X X X X O . O . O X X . | $$ | X X O . . X O X O X O . . . . . . . . | $$ | . . . X X X O O O O O . O X . X X X . | $$ | X X X X O X X O . . . . . X . . . O . | $$ | O O O X O X O X X . X . X . . O X X O | $$ | . X O O O O O . . . . . . O . . . O . | $$ | . X X . . . . O O O . O . . . O O . . | $$ | . O X . X X X . X . O X O O . . X X . | $$ | . O . X X O . . . X X X . X X X . . . | $$ | . . . . O O O O X . . . . . . . W W . | $$ | . . O . X O X X . . . . . . . W X X . | $$ | . . . . O X . . . . . . . . . . W X . | $$ | . O O O . X . . . . . . . . W . W W X | $$ | . X X . . . . . . . . X X X W . . X . | $$ | . . . X . X . . . X . . . O X X X . . | $$ | . . . . . . . . . . . O . O O . O X . | $$ | . . . . . . . . . X . . . . . O O O X | $$ | . . . . . . . . . . . . . . . . . X . | $$ +---------------------------------------+[/go]


Black to play and do something about the marked white group. (The S1-R2 exchange didn't actually happen in the game; I've added those stones to reduce distractions.)
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Knotwilg
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Re: Life and death in an old handicap game

Post by Knotwilg »

I guess protect and make ko?
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kvasir
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Re: Life and death in an old handicap game

Post by kvasir »

I think it is like this...
Click Here To Show Diagram Code
[go]$$B $$ +--------------------------------------+ $$ | . . . . O X X . . . O . . . . . . . .| $$ | O O . O O X O X X X X O . O . O X X .| $$ | X X O . . X O X O X O . . . . . . . .| $$ | . . . X X X O O O O O . O X . X X X .| $$ | X X X X O X X O . . . . . X . . . O .| $$ | O O O X O X O X X . X . X . . O X X O| $$ | . X O O O O O . . . . . . O . . . O .| $$ | . X X . . . . O O O . O . . . O O . .| $$ | . O X . X X X . X . O X O O . . X X .| $$ | . O . X X O . . . X X X . X X X . . .| $$ | . . . . O O O O X . . . . . . . O O .| $$ | . . O . X O X X . . . . . . . O X X 2| $$ | . . . . O X . . . . . . . . 5 1 O X 4| $$ | . O O O . X . . . . . . . . O 3 O O X| $$ | . X X . . . . . . . . X X X O . . X .| $$ | . . . X . X . . . X . . . O X X X . .| $$ | . . . . . . . . . . . O . O O . O X .| $$ | . . . . . . . . . X . . . . . O O O X| $$ | . . . . . . . . . . . . . . . . . X .| $$ +--------------------------------------+[/go]


Click Here To Show Diagram Code
[go]$$W Only one eye $$ +--------------------------------------+ $$ | . . . . O X X . . . O . . . . . . . .| $$ | O O . O O X O X X X X O . O . O X X .| $$ | X X O . . X O X O X O . . . . . . . .| $$ | . . . X X X O O O O O . O X . X X X .| $$ | X X X X O X X O . . . . . X . . . O .| $$ | O O O X O X O X X . X . X . . O X X O| $$ | . X O O O O O . . . . . . O . . . O .| $$ | . X X . . . . O O O . O . . . O O . .| $$ | . O X . X X X . X . O X O O . . X X .| $$ | . O . X X O . . . X X X 4 X X X . 6 5| $$ | . . . . O O O O X . . . . . . 8 O O .| $$ | . . O . X O X X . . . . . 3 1 O . 7 O| $$ | . . . . O X . . . . . . . 2 X X O . O| $$ | . O O O . X . . . . . . . . O X O O X| $$ | . X X . . . . . . . . X X X O . . X .| $$ | . . . X . X . . . X . . . O X X X . .| $$ | . . . . . . . . . . . O . O O . O X .| $$ | . . . . . . . . . X . . . . . O O O X| $$ | . . . . . . . . . . . . . . . . . X .| $$ +--------------------------------------+[/go]


Click Here To Show Diagram Code
[go]$$W No escape but black has to be careful $$ +--------------------------------------+ $$ | . . . . O X X . . . O . . . . . . . .| $$ | O O . O O X O X X X X O . O . O X X .| $$ | X X O . . X O X O X O . . . . . . . .| $$ | . . . X X X O O O O O . O X . X X X .| $$ | X X X X O X X O . . . . . X . . . O .| $$ | O O O X O X O X X . X . X . . O X X O| $$ | . X O O O O O . . . . . . O . . . O .| $$ | . X X . . . . O O O . O . . . O O . .| $$ | . O X . X X X . X . O X O O . . X X .| $$ | . O . X X O . . . X X X . X X X . . .| $$ | . . . . O O O O X . . . . . . 2 O O .| $$ | . . O . X O X X . . . . . . 3 O X X .| $$ | . . . . O X . . . . . . . . . X O X 4| $$ | . O O O . X . . . . . . . . O 1 O O X| $$ | . X X . . . . . . . . X X X O . . X .| $$ | . . . X . X . . . X . . . O X X X . .| $$ | . . . . . . . . . . . O . O O . O X .| $$ | . . . . . . . . . X . . . . . O O O X| $$ | . . . . . . . . . . . . . . . . . X .| $$ +--------------------------------------+[/go]
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xela
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Re: Life and death in an old handicap game

Post by xela »

Knotwilg wrote:I guess protect and make ko?
That's what happened in the game, and probably what I would have done too. Black wins the ko but loses the game decisively: white has multiple large ko threats to break into the bottom left area.
kvasir wrote:I think it is like this...
Yes, that's the best move :-)
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