Beginner Exercise 257 / Solution

Sub-page of BeginnerExercise257
[Diagram]

Black lives



[Diagram]

Black lives again

togo: This W2 loses White two stones and one ko-threat compared to W2 on B3.

xela: This might look like a ko, but actually there is no way for white to put black into atari, so black is unconditionally alive in this diagram, and the two white stones will be removed as prisoners at the end of the game. Black shouldn't play any more moves in this position. I think "loses two stones" means "loses two points": in the first diagram on this page, black has 5 points of territory (counting the two white prisoners), whereas this diagram gives black 7 points.

[Diagram]

... and again

togo: This W2 gets one ko-threat less for White than W2 on B3.

[Diagram]

Failure

This is a ten-thousand year ko.



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