For lessons, as well as threads about specific moves, and anything else worth studying.
Ian Butler
Lives in gote
Posts: 646 Joined: Thu Dec 29, 2016 4:09 pmGD Posts: 0Has thanked: 62 times Been thanked: 116 times
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by Ian Butler Thu Dec 20, 2018 11:33 am
A fun corner L&D I came across in a game by Yuan Zhou.
White makes an endgame mistake after the exchange white A, black B. (triangled stone is there only to illustrate black is strong there and can't be cut. There was no actual stone on that position, but it matters not in this L&D)
White plays tenuki.
Black to kill.
Answer:
Explanation:
After the exchange of A and B, white needs to add another move in the corner. If he doesn't, black kills by cutting. White can atari the stone but is then stuck in a liberty problem. He cannot atari the stones once white drops down (either way) and is dead in the corner, making for a 30 point swing in the game.
The mistake, says Yuan Zhou, lays earlier in the cirkled stone move. He played that one instead of 2, making black's 1 sente that has to be answered at white 2 instead of at the squared spot. Hope this makes sense because I saw the game and maybe it's not clear from only this position. 1 and 2 weren't played yet and white played the cirkled stone instead of 2, that's what I mean.
The second mistake was playing tenuki, of course.
Leon
Dies in gote
Posts: 37 Joined: Thu Sep 06, 2018 1:31 pmRank: EGF 2dGD Posts: 0Has thanked: 8 times Been thanked: 11 times
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by Leon Sun Dec 23, 2018 3:00 am
This is both a fun and an instructive problem (I think that positions like this are sometimes referred to as the Golden Chicken Standing on One Leg
https://senseis.xmp.net/?GoldenChickenStandingOnOneLeg ).
Here is a related but yet very different position: Don't let the golden chicken ruin your christmas and survive as black:
$$c Black to live. (Edit: I fixed a mistake in the original problem. Thank you Shaddy.)
Click Here To Show Diagram Code [go]$$c Black to live. (Edit: I fixed a mistake in the original problem. Thank you Shaddy.)
Last edited by
Leon on Tue Dec 25, 2018 2:27 am, edited 2 times in total.
MikeKyle
Lives with ko
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by MikeKyle Sun Dec 23, 2018 4:48 pm
Thanks both. The first post is a really nice example of a sensible enough looking but deadly endgame blunder.
The second post has three of my favourite things:
- Poetry
Leon wrote: Don't let the golden chicken ruin your christmas
- A really fun novel problem that is achievable but not obvious at my level
And..
Shaddy
Lives in sente
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by Shaddy Mon Dec 24, 2018 6:39 pm
$$c Black to live.
Click Here To Show Diagram Code [go]$$c Black to live.
mhlepore
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by mhlepore Mon Dec 24, 2018 7:32 pm
Yuan Zhou wrote a book (which I'm not sure if it's in print anymore), where reviews a game that he lost because of this life and death problem. He was ahead, thought his corner was alive, so he tenukied.
Leon
Dies in gote
Posts: 37 Joined: Thu Sep 06, 2018 1:31 pmRank: EGF 2dGD Posts: 0Has thanked: 8 times Been thanked: 11 times
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by Leon Tue Dec 25, 2018 2:24 am
Shaddy wrote:
$$c Black to live.
Click Here To Show Diagram Code [go]$$c Black to live.
Oof, how embarassing for me. I will fix the problem. Thank you
