Gokyo Shumyo, Section 1, Problem 57 / Solution


Traditional Solution  

W1 threatens a double atari at B2, in which case White escapes. Next White occupies the vital point at B3. In terms of life and death, the points a and b are now miai, while the circled point provides an eye.

Alternative Solution  

W3 here also lives. a and b are miai.

(The exchange White b and Black c does not affect the solutions. The resulting shape is a notcher with code 213WN.)


Failure at 3  

For someone familiar with notchers, it is clear that W1 is not the correct way to make the group live. B2 becomes the vital point.

Failure at 1  

This W1 fails: Black takes the vital point and reduces the shape to six on the second line? which is dead. (Incidentally, if we make the exchange White a - Black b, this is a notcher of code 123NN with the same result.)

Variation at 2 (escape variation A)  

If Black permits the double atari, after White 7 at the marked stone, he faces either the capture at a or the escape at b.

Variation at 2 (escape variation B)  

Black could answer the double atari W3 with B4. White gets out in this variation, but Black can still attack later on, perhaps with a.


Gokyo Shumyo, Section 1, Problem 57 / Solution last edited by hnishy on January 19, 2023 - 00:24
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