Gokyo Shumyo, Section 1, Problem 38 / Solution

Authors:

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

[Diagram]
Main line  

[Diagram]
Variation 1: an eye in the corner  

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

[Diagram]
Variation 1a (continuation)  

Demonstration of W5 giving two eyes.

[Diagram]
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.

[Diagram]
Slightly worse, variation  

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

[Diagram]
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.

[Diagram]
Wrong  

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

[Diagram]
Variation 2  

What about Black playing the monkey jump right away?

[Diagram]
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


Gokyo Shumyo, Section 1, Problem 38 / Solution last edited by xela on November 8, 2008 - 02:10
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