HitachiNumber121/solution

Sub-page of HitachiNumber121
[Diagram]

Official solution

White dies [ext] http://www.hitachi.co.jp/Sp/tsumego/igo122/121ae.htm

[Diagram]

Variation for W2: ko?

However, it looks like White can make ko:

[Diagram]

Ko 1: black's mistake

hnishy: B5 at W6 captures the four White stones, doesn't it?.

xela: I've added a diagram later to show this variation.

kmr - yes, it looks like ko is not possible to achieve this way. After 5 at 6, white cant save four lower stones. White is dead.

[Diagram]

Ko 2: a different mistake from black

[Diagram]

Black's correct response: no ko

If black plays B5 here, then the white+circle stones are captured


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