Source:
Problem diagram.
White plays.
Segoe Kensaku & Go Seigen, Ishi Press
Solution follows (or click here to download SGF)
Uninspired.
White 1 is slack. Black simply blocks at 2.
White has needlessly thrown away points in the
corner.
Another failure.
White 1 might look dangerous, but after Black 2, White can
no longer make headway against Black's corner.
Correct.
White 1 is a clever tesuji worth remembering.
Black will submit with 2, after which
3 gives White the maximum profit from the
corner.
Black variation.
Black could try to cut off White with 2.
However, through 5, White forces an unfavorable
ko on Black.
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