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  2007-08-13

Problem diagram.
White plays in the upper right.

Source:
American Go Journal , Vol. 17, No. 4, Dec 1982, pp. 25-26
Keshi and Uchikomi
Kaoru Iwamoto 9p

Solution follows    (or click here to download SGF)






























The usual approach.
White 1 is typical. The variations are too numerous to show, but the following lines give a flavor for what White can, and cannot, expect when playing against such a formation. Given Black's initial dominance in the upper right, the result of this diagram is fair for both sides. Black secures territory, while White establishes influence over the upper side and retains some aji with the White stone at 3.


Black variation.
Black can vary with 2 to limit White's influence on the upper side. Through 6, Black has territory at the top, but White has invaded the right side. The situation is nearly balanced.


Too aggressive.
White 1 leads naturally to Black 8, after which White has a weak position. If White tries to solidify with 9, Black follows with 10. Black loses hardly any area, while White will have to flee to make life. Black has a clear advantage.


Too deep.
White 1 is unreasonable. Black caps with 2, or could also play at A. Either way, White has no foundation and must escape while Black controls the game flow.


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