In-game tsumego (5k vs. 4k)

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jts
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In-game tsumego (5k vs. 4k)

Post by jts »

What's the status of the white top group after move 161? No peeking!

[deleted]

My answer:
Totally alive. W can start with a variety of moves, but W n14 is sente to connect or make a second eye. If B plays to prevent N14, W gets two moves in a row to divide his eyespace.
Last edited by jts on Thu Feb 23, 2017 8:26 pm, edited 1 time in total.
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Re: In-game tsumego (5k vs. 4k)

Post by topazg »

White 168 was a weird move. Plenty of living moves he could have done instead.
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iazzi
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Post by iazzi »

definitely alive. In the game the losing move looks 170 M19. Probably a misclick, since M18 makes life...

@topazg: 168 seems proper. If white 168 is at h18, when black starts with the clamp of m18 he can gain an important liberty and white has to see the l19 tesuji...

The group looks alive even later if w180 is at N14

or maybe my reading just fails spectacularly...
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Re: In-game tsumego (5k vs. 4k)

Post by jts »

@topazg - greed, I think... he probably thought (correctly imo) that he could live without giving me the monkey jump.
@iazzi - yes, you're right that he should have pulled back, and even after that mistake, had N14 not been available, there's the L18 ko. At first I thought that my hane was itself a mistake and that I could have forced the same sequence with a clamp, but that runs into a shortage of liberties problem.

In the game I sort of lazily hoped that after N14, I could connect in a way that threatened the white group below, but after the game I discovered that that was crazy.
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