Gokyo Shumyo, Section 1, Problem 83 / Solution

Main line

[Diagram]

Main line

Variation [1] discusses B8 @ B10.

[Diagram]

Continuation

White 11 makes a first eye, a and b being miai. White 13 threatens to kill the corner in a capturing race: see variation [2]. Hence Black 14 connects. White 15 makes the second eye. If she omits it, Black at c or 15 destroys the second eye.


Variations

[1]

[Diagram]

variation 1

If Black 8 at B1 here, White wins the capturing race. Losing four moves with a to d, she still has 7 liberties left to attack, while Black has only three to defend (he'll have to react to one).


[2]

[Diagram]

Variation 2

a to f are theoretically Black's semeai liberties (he's on the defence), but to c or d (atari) and a (two eyes) he has to react, which leaves him with 4 liberties. White has already 6 at the circled points (minus g to connect) so she clearly wins the race.


This is a copy of the living page "Gokyo Shumyo, Section 1, Problem 83 / Solution" at Sensei's Library.
(OC) 2007 the Authors, published under the OpenContent License V1.0.
[Welcome to Sensei's Library!]
StartingPoints
ReferenceSection
About