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  

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.

Back to Kanazawa Tesuji Series
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Gokyo Shumyo, Section 1, Problem 57 / Solution last edited by CharlesMatthews on January 21, 2003 - 16:35
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