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 Post subject: 5k vs 5k and three question review
Post #1 Posted: Thu Jan 16, 2020 4:15 am 
Lives with ko

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Hi all,

I played with white and I probably performed at least 4 stone below my usual level, cannot say why. I ask for a review basically on

1) General direction of play
2) The strange outcome on the lower left corner. In the counting phase we cannot say for sure if it was seki or dead and there is some (apparentely) infinte ko if you try to reduce the shape to a well known dead 4-bent in the corner.
3) How to handle the upper right corner against that reduction.

Thanks as usual.


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 Post subject: Re: 5k vs 5k and three question review
Post #2 Posted: Thu Jan 16, 2020 4:28 am 
Honinbo

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Hi, Fllecha,

Happy New Year! :D

Fllecha wrote:
2) The strange outcome on the lower left corner. In the counting phase we cannot say for sure if it was seki or dead and there is some (apparentely) infinte ko if you try to reduce the shape to a well known dead 4-bent in the corner.


The bottom left is a standard Bent Four. White is dead by Korean and Japanese rules, and probably by area rules, I did not check. The ko is characteristic of Bent Four. :) Black takes first, and is presumed to be able to win it under Japanese and Korean rules. By area rules (Chinese and others) before making the ko Black eliminates all of White's ko threats for free. On rare occasions Black cannot do so, and then may leave the Bent Four as seki.

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Post #3 Posted: Thu Jan 16, 2020 11:00 am 
Honinbo
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Hi Fellecha,

For (2), BentFourInTheCornerIsDead.


This post by EdLee was liked by: Fllecha
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