Gokyo Shumyo, Section 1, Problem 74 / Solution

Variations: by many contributors, whose names can be viewed by clicking "Page Info" at the bottom.

Main line  
Main line - continuation  

White captures three to make an eye. Black can't protect there because of shortage of liberties.


Variation (i) at 8  

If B8 at B1 here, cutting at W2 makes miai of a and b. Note that if White sacrifices just one stone (black+circle at c), it's a ko after B3 at a.

Variation (i) at 8 - a  

Capturing at W4 makes a second eye at black+circle. Black can't play B7 at a.

Variation at 8 - b  

Here too White makes two eyes at the circled points.

Variation (ii) at 8  

If Black connects at B1, the atari at W2 is sente (see next diagram) and W4 makes a bent four living shape.

Variation (ii) at 8 - variation  

If B3 here, capturing three stones with W4 assures a quiet life. Even if Black throws in at B5, White is alive with a and b being miai.

Variation at 4  

Giving atari this way would not be very smart. White now captures either at a or at b.

Variation at 2 (B11 at W8, W12 at a)  

B1 is met by W2 here. White fire off the sequence W4-B10 then.


We will have a look at some preparatory moves: why White should not yet start the well-known sequence.

Failure (i) at 7  

If a has not yet been exchanged for b, White runs out of options. Whatever she does, Black will connect at c.

Failure (ii) at 7  

Blocking here is not sente: Black can take time to hane. White can't makes an eye in the corner because a and b are miai for Black.

If W3 at b then B4 at a and there are only false eyes in the corner.

Failure (i) at 5  

The sequence becomes less effective, the more preparatory moves are omitted.

Failure (ii) at 5  

See previous diagrams.

Failure: only ko  

If W3 cuts immediately, then White can only achieve a ko and not unconditional life.


Gokyo Shumyo, Section 1, Problem 74 / Solution last edited by hnishy on January 12, 2023 - 03:10
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