Source:
Problem diagram.
White plays.
Segoe Kensaku & Go Seigen, Ishi Press
Solution follows
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Beautiful.
The attachment at 1 works surprisingly well here.
No matter what Black does, White's stones will all work together.
Black's atari at 2 from the outside immediately gives White the corner.
In compensation, Black 6 forms outside thickness.
Through 12, Black forms an even stronger wall facing up the left side,
but White has taken nice corner territory in sente.
Black variation.
Black can atari from the inside at 2 to keep the corner.
But after 5, both of White's groups have running room down the left and bottom sides.
Black has no choice but to make life in the corner with 6.
Up to 9, Black has only made a tiny life in the corner,
and White's groups have become stronger while pressuring the weak left center group.
White is happy with the result.
A mistake.
With 1, White misses his opportunity.
Black 2 takes the key point.
At best, White is now going to lose either the 2 left stones or 2 of the bottom stones.
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