Tsumego From Games 19

    Keywords: Problem
[Diagram]

Status of the lower right corner

Black has played the marked sequence to kill the white group. Can white still live ? If so, does Black have any alternatives for this sequence ?

Dieter


[Diagram]

The corner is ko

First, white can get a ko. Moves from 1 to 4 are forced. Then the order of moves can be changed, the result is still ko. If W5 at 7 then B8, W9, B6, W5. If B6 at 8 then W9, B6, W7.

[Diagram]

White dies.

But black can do better. The exchange B1 for W2 in the first diagram is bad style as it's not necessary. If black starts with this 1 white dies.

[Diagram]

White dies 2.

This W2 is tricky but B3 is good.

Lucky


Thanks a lot. I found the ko and Black's improvement, but I didn't deduce the bad style move because I didn't think about the last diagram. It is remarkable how a higher dan's answer combines accuracy and conciseness. --Dieter


This is a copy of the living page "Tsumego From Games 19" at Sensei's Library.
(OC) 2009 the Authors, published under the OpenContent License V1.0.
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