# Beginner Exercise 140 / Attempts

Sub-page of BeginnerExercise140
Black to play.

Hikaru79: This ends up extremely bad for black. White lives with either two prisoners in gote or one prisoner in sente.

unkx80: To Hikaru79: Actually, this is the sequence I am expecting. But the order of moves is wrong in this diagram.

Black to play.

unkx80: Both diagrams are wrong.

Malweth: My try

White has Ko to live

unkx80: Good try, but unfortunately , and are wrong moves.

Black to play.

This leads to ko, I think, and if B has enough threats. In place of , W can't simply connect at as in the diagram below, else:

Continued - connect

and now it IS a ko for life. Therefore, W would have to play so as indicated in the next diagram, in place of above.

Continued - capture

Which is quite the difference.

unkx80: Chris's solution is right, after I gave the hint and the comment. To being the discussion to a slightly higher level, I shall also mention the following in passing.

Discussion.

Without the black stone at a, can extend and say arigato to Black for the free gift. Obviously White should not play at b otherwise black can play at and thank White instead.

Discussion.

On the other hand, with the marked stone, is not good, as starts a one step ko compared to a two step ko in the solution.

Discussion.

So without Black a, Black should atari at . The correct response is , irregardless whether there is a Black stone at a. I believe this is probably a IGS 1k* level indicator.

Beginner Exercise 140 / Attempts last edited by CharlesMatthews on November 2, 2003 - 20:31
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