TsumegoFromGames42/Solution

Sub-page of TsumegoFromGames42
[Diagram]

Double ko death

W1 is the vital point.

After W9, if B a, then W b. If B b, then White captures four stones (connect and die).

If B6 is at B7, W6 prevents a second eye, as in variation 1.

(W5 could also be at W7. If then B8, W5.)

[Diagram]

Variation 1

After B4 secures W1, W5 prevents a second eye.

B8 and W9 are miai.

[Diagram]

Variation 2

After B2, W3 prevents a second eye. Even with B4 Black cannot create an eye in the corner.

If B4 is at B5, W4 reverts to variation 1.


Failure

[Diagram]

Big ko



[Diagram]

Big ko (ii)



[Diagram]

Big ko (iii)

[Diagram]

Small ko



[Diagram]

Oshitsubushi



[Diagram]

Bad ko

Black takes this ko first.


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(OC) 2007 the Authors, published under the OpenContent License V1.0.
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