GokyoSeimyoVolume3Problem4/Attempts

[Diagram]

Key move

W1 is the key move, now there are several lines of play:

[Diagram]

Ko

If black captures with B2, white starts a ko in the corner to capture three stones. Black cannot connect because of oiotoshi.

[Diagram]

Double damezumari

If black plays B2 to prevent the ko, W3 results in double damezumari, and thus captures the black+circle stones.

[Diagram]

Throw-in

Preventing the ko with B2 doesn't work either. White throws in with W3, and after W5 it is double damezumari again. This throw-in also work if B2 is at a.

[Diagram]

Ko or double damezumari

This B2, preventing the throw-in, results in ko again. Although defending with B6 at W3 is no longer oiotoshi, white will then play W7 at a and it is double damezumari yet again.


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(OC) 2009 the Authors, published under the OpenContent License V1.0.
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