Gokyo Shumyo, Section 1, Problem 13 / Solution

Main line: Hashimoto Utaro 9p
Variations: Dieter, unkx80, Bill Spight, tderz, xela

White lives  

White has to start with W1 [1]. There are many interesting variations.

Main line  

If Black tries to save his monkey jump marked stone. White throws in at W3 and creates shortage of liberties at a with W5. If Black resolves the shortage of liberties with B6, White plays W7, making miai of b and c.

We shall gradually investigate the alternatives back to W1.

Variation 1  

Depending on the situation on the upper side, Black can choose not to resolve the shortage of liberties, but instead play B6 here.

Variation 1 (cont)  

W3 captures four stones, and B4 throws in again at B2.

Variation 1 (cont)  

White connects, and gets one eye, and if Black makes the other one false with B3, White runs away with W4.[2] If Black is strong in the environment of W4, however, he can kill White, so one has to bear in mind that the status of the white group heavily depends on the upper side conditions. (this variant is elaborated in [3] )

Variation 2  

This is the variation in which Black permits his monkey jump to be cut off by playing B2; it results in seki. W3 is important. The rest of the moves are more or less forced. W8 and B9 complete the shape.

White has all of her stones in one chain, so in order to capture them, Black has to play either a or b. In both cases a live bent four shape results. So Black will play neither of them, giving seki.

Variation 2 (mistake at 3)  

(10 recaptures at 8)

W3 in the above diagram is important for the shape created. If White carelessly plays descent at W3, Black kills at B4.

Variation 3  

If Black answers W1 as here with B2, White doesn't make a fool of herself and she lives with W3 and W5. Playing W3 at B4, instead, would enable Black to make seki.

[1] White can start with another move too, but it is worse in terms of points:

Variation 4  

If B2 at W3, W3 at B2 reverts to Variation 2. If B2 at B4, W3 at B2 reverts to Variation 1.
Of course, Black prefers this way of allowing White life.

Variation 4a  

If B4 at W5, then White plays at a and lives by seki.

Wrong (10 at 7)  

The points W1 and B2 are both vital points in this position and if White rushes to take one, Black takes the other. Here, throwing in as before with W7 doesn't work any more.

Wrong (ii)  

W1, B2, and it's all over.


There is an unwritten convention in life-and-death problems that to escape is to live.


碁経衆妙 Gokyō Shumyō, part 生之部

Problem 14
Back to Kanazawa Tesuji Series

Gokyo Shumyo, Section 1, Problem 13 / Solution last edited by Dieter on July 31, 2014 - 09:26
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