Gokyo Shumyo, Section 1, Problem 57 / Solution

Main line  

White 1 threatens a double atari, in which case White escapes. Next White occupies the vital point at 3. In terms of life and death, the points a and b are now miai, while the circled point provides an eye.

Failure at 3  

If instead of 3 in the main line, White plays at 1 here, Black occupies the vital point. Up to 9, White lives with ko, for Black can start one at a.

If we make the exchange of 3 and 4 first, this shape is a notcher with code 213WN, which White tries to make alive with 1.

Failure (ii) at 3  

For someone familiar with notchers, it is clear that White 1 is not the correct way to make the group live. Black 2 becomes the vital point.

Failure at 1  

This White 1 fails: Black takes the vital point and reduces the shape to 6 in a row which is dead. Incidentally, if we make the exchange White a - Black b, this is a notcher of code 123NN.

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.

Back to Kanazawa Tesuji Series
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Gokyo Shumyo, Section 1, Problem 57 / Solution last edited by Malcolm on June 30, 2022 - 10:41
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