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


Tsumego From Games 19 last edited by CharlesMatthews on January 23, 2003 - 18:39
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