Gokyo Shumyo, Section 1, Problem 38 / Solution

Authors:

Main line: Hashimoto Utaro 9p
Variations: HolIgor, Dieter Verhofstadt 1k

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Main line


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Variation 1: an eye in the corner

If Black answers at B2, White has W3 to make miai of a and b for life.

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Variation 1a (continuation)

Demonstration of W5 giving two eyes.

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Slightly worse

White can also live by playing at W1. Black removes the aji with B2 and gets two points more compared to variation 1a.

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Slightly worse, variation

This B2 looks frightening, but white can capture some stones. (Either a or ''b' next will win the capturing race.)

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Slightly worse 2

If White starts here, then a sequence similar to Variation 1a makes Black one point better off. Looking back at 1a, it would be as if White afterwards exchanged W1 for B2, which effectively gives away 1 point.

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Wrong

White must be very careful not to play W3 in reply to B2, because B4 kills her.

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Variation 2

What about Black playing the monkey jump right away?

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Variation 2 (continuation)

White cuts at W3 and after W9, Black can't play at a because of shortage of liberties. By the way, W3 at B4 would be a mistake.

[Diagram]

Mistake in Variation 2


Problem 39


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