Yose from Games 5 / Attempts

Sub-page of YoseFromGames5
[Diagram]

Attempt 1 (6 at the position of the marked stone)

[Diagram]

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]

Black's failure

B1 here instead of B8 is not good. White makes a seki. This is 6 points worse for black than the previous answer.

Andre Engels

Bill:
[Diagram]

Key point

In this position, I think that W1 is the key point, instead of the atari at a. Next:

[Diagram]

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]

Key point (1a): No Seki

Oops! I had overlooked B4, which avoids both seki and ko. :-(

[Diagram]

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 (B4 in the Key Point (1a) diagram), my original (supposed) solution was wrong. Let me try again.

[Diagram]

Attempt 2

(BS was the last play before this diagram.) W7 connects at BC.
After Black fills at 2, W3 plays atari. Now B4 is tesuji, allowing B6. W7 - B8 is sente, which can be played later.
This position can be reached after W7 in Andre's original digram. B4 gains 2 points for Black, by comparison with the hane at 8.



Solution


This is a copy of the living page "Yose from Games 5 / Attempts" at Sensei's Library.
(OC) 2005 the Authors, published under the OpenContent License V1.0.
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