Source:
Problem diagram.
Black plays.
Segoe Kensaku & Go Seigen, Ishi Press
Solution follows
(or click here to download SGF)
The only move!
How Black 1 can cause trouble here with White having
so much eye space is simply amazing.
If White makes the obvious move at 2 to capture the throw-in
stone, then Black 3 is a free atari.
If White 4 captures the stone,
then Black has the snapback at 7 to save his stones.
White variation.
White can switch to 4 to save the 3 upper White stones.
But after Black 7, the White stones to the left will lose the capture race.
White variation.
Defending with White 2 on the left side cannot avoid a loss either.
If White defends the top 3 stones with 4, then
Black 5 makes an even bigger capture of the 4 stones to the right.
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