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Yose from Games 5 / Attempts
![[Diagram]](../../diagrams/12/6baac42916b259a3f834daf16c9766f7.png) | Attempt 1 (6 at the position of the marked stone) |
![[Diagram]](../../diagrams/46/f1654b6dbbde84b810d1e0f26244bf61.png) | Attempt 1 (continuation) |
White 13 and 15 are of course kept back as ko threats. Black's territory is reduced to 8 points, while white has captured a stone.
![[Diagram]](../../diagrams/9/5386659ec77bf430426825b32cb02e37.png) | Black's failure |
here instead of is not good. White makes a seki. This is 6 points worse for black than the previous answer.
Andre Engels
- Bill:
![[Diagram]](../../diagrams/37/8c698faee4a2ed2a0a79138199ae89fe.png) | Key point |
In this position, I think that is the key point, instead of the atari at a. Next:
![[Diagram]](../../diagrams/40/2a129bffd47faf8d14e55bd7ef7845bb.png) | Key point (1): Seki |
If Black connects, White makes seki in sente, for a result of -4. (White has lost 2 stones, but Black will have to give up one later.)
![[Diagram]](../../diagrams/6/b4d097ae7ce9e535f2ec909517886ebd.png) | Key point (1a): No Seki |
Oops! I had overlooked , which avoids both seki and ko. :-(
![[Diagram]](../../diagrams/25/aaf8a103b354c88586391202eb1df65d.png) | Key point (2) |
If Black takes the corner, White captures 4 stones in sente. The result is also -4. White has 14 points, but Black has 10.
Bill: Since I had overlooked Black's play on the 2-1 ( in the Key Point (1a) diagram), my original (supposed) solution was wrong. Let me try again.
![[Diagram]](../../diagrams/28/c6e42fe76c17fcc922a75d7cef94ce98.png) | Attempt 2 |
( was the last play before this diagram.) connects at .
After Black fills at 2, plays atari. Now is tesuji, allowing . - is sente, which can be played later.
This position can be reached after in Andre's original digram. gains 2 points for Black, by comparison with the hane at 8.
Solution
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"Yose from Games 5 / Attempts" at
Sensei's Library.
2004 the Authors, published under the OpenContent License V1.0.
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