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2008-01-20
Problem diagram.
White to play to reduce the upper right corner.
Source:
American Go Journal , Vol. 18, No. 4, 1984, pp. 29-30
Keshi and Uchikomi
Kaoru Iwamoto
Solution follows
(or click here to download SGF)
One option.
White can try to invade directly at 1, but White
has to worry about Black solidifying and extending
his formation while pressuring the invading stone.
Another option.
White might try starting at 1, which is the strongest
point of attack against the small knight enclosure.
After Black 2 defends the right side, White 3 jumps
into the top. After Black defends with 4, White can
play lightly with 5. Black's marked stone can now extend
toward the center with the idea of attacking White's group
later. See the SGF for another possibility for White.
Black variation.
Black 2 can also defend the top, but then White can reduce
Black's right side framework with a flexible shape through 7.
If Black tries to cut White with 8 and 10, White 11 makes a
strong formation, while Black takes only a tiny profit.
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