Real middle-game problem

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Uberdude
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Real middle-game problem

Post by Uberdude »

Click Here To Show Diagram Code
[go]$$Bc White to play, 7.5 komi, black 8 captures, white 2.
$$ ---------------------------------------
$$ | . O . . . . X . O . . . . . . . . . . |
$$ | X O X X . X . X O . . X . O . . . . . |
$$ | . X . X X X X O O O O X O . O . O X . |
$$ | X . . , X O X O X O X X X O O O X . . |
$$ | . X . X O O O X X X O . . X . . X . . |
$$ | O O X X X . O . . . O . O O O O X . . |
$$ | . X . X . . . O . . . . X O X X . . . |
$$ | . . . X . . . . . . . . X X X . X . . |
$$ | . . . . . . . . . . . . O O X O . . . |
$$ | . . . O . B . . . , . . . . O O . . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . X . O . O . O X O O . |
$$ | . . . . . . . . . . . . . . . . X X . |
$$ | . . X X X . . . . X . X X X X X X O . |
$$ | . . O O O X . . . . . . O O X O O O . |
$$ | . . . . . O . . . . . . . . O . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
This move was high up my policy network, and after reading a few things I stuck with it:
Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . O . . . . X . O . . . . . . . . . . |
$$ | X O X X . X . X O . . X . O . . . . . |
$$ | . X . X X X X O O O O X O . O . O X . |
$$ | X . . , X O X O X O X X X O O O X . . |
$$ | . X . X O O O X X X O . . X . . X . . |
$$ | O O X X X . O . . . O . O O O O X . . |
$$ | . X . X . . . O . . . . X O X X . . . |
$$ | . . . X . . . . . . . . X X X . X . . |
$$ | . . . . . . . . . . . . O O X O . . . |
$$ | . . . O . X . . . , . . . . O O . . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . 1 . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . X . O . O . O X O O . |
$$ | . . . . . . . . . . . . . . . . X X . |
$$ | . . X X X . . . . X . X X X X X X O . |
$$ | . . O O O X . . . . . . O O X O O O . |
$$ | . . . . . O . . . . . . . . O . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
When reviewing the game afterwards with LZ I was pleased to see it agreed:
Annotation 2019-12-11 163143.png
Annotation 2019-12-11 163143.png (1.55 MiB) Viewed 3595 times
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xela
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Re: Real middle-game problem

Post by xela »

Nice! I get the feeling that something ugly has happened in the upper left earlier in the game...

I got the right area but picked a different move. But LZ seems to be saying that anything in that general region will work, it's just that one point is much more LZ-intuitive than the others, and having analysed one move that's good enough to win decisively, LZ doesn't feel the need to investigate alternatives. When I do click on other moves in the same area, they're all about equally good.

Actually, it's hard to find a move for white that loses from this position (A15 does the job), although there are plenty of ways to knock 10% off the winrate.
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