# Gokyo Shumyo, Section 1, Problem 74 / Solution

Main line: Hashimoto Utaro
Variations: Dieter

Main line
Main line - continuation

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

### Variations

Variation (i) at 8

If at here, cutting at makes miai of a and b. Note that if White sacrifices just one stone ( at c), it's a ko after at a. :

Variation (i) at 8 - a

Capturing at makes a second eye at . Black can't play at a.

Variation at 8 - b

Here too White makes two eyes at the circled points.

Variation (ii) at 8

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

Variation (ii) at 8 - variation

If here, capturing three stones with assures a quiet life. Even if Black throws in at , 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
Variation at 2 - continuation

at . The variation is long, but up until in this diagram it is forced and the - exchange is well known. White has to find the throw-in at , though.

Variation at 2 - variation

(Black 11 at .)

Maybe it is simpler to play here and fire off the sequence - then.

### Failures

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 at b then 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 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 July 11, 2018 - 14:51
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