TsumegoFromGames134/Solution

Sub-page of TsumegoFromGames134

This is actually an endgame problem.

[Diagram]

Black plays first

B1 secures his territory. Later W4 - B5 are ambiguous. Black gets 9 points of territory.

[Diagram]

White plays first

W8 fills at white+circle.

W1 puts the four black+circle stones in atari. Later W3 - B10 are sente. Black gets 3 points and White gets 8 points, for a net local score of -5. The original position has a count of +2, and a play gains 7 points.


Ko

[Diagram]

Two stage throw-in ko

If B2 connects his stones, White can make a two stage throw in ko. Black may choose this option if he is komaster.

[Diagram]

Ko avoidance

If White starts with W1, B2 may reply without ko. Then Black cannot connect after W3.

[Diagram]

Ko threat

Black can still play for ko with B2, but then White can use a as a ko threat, or play there to capture if Black plays at b without making ko.



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