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2007-08-27
Problem diagram.
Black plays.
Source:
Igo Hatsuyo-ron #72 : 300 year old problem set for student professionals.
How much eye space must White have to guarantee 2 eyes?
This problem shows that eye space is like money; knowing how much is good enough to live on can be a difficult question!
Analysis:
Myron Souris
Solution follows
(or click here to download SGF)
Correct.
Black 1 and 3 are the only try if Black wants to kill everything.
See the SGF for many more variations.
Continuation.
White 4 captures 13 stones, which you would think is surely enough for 2 eyes.
But you would be wrong. Black 5 exposes a fatal flaw in White's position.
After White 12, Black simply connects and White ony has 1 eye.
White variation.
With 8, White can try to escape to the outside. But assuming that the
ladder works for Black, Black 9 and 11 captures White.
Black failure.
Black 5 looks strong, but is a mistake. After White defends through
move 12, Black has run out of steam. White lives.
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