BeginnersEndgameExercise5/Solution

[Diagram]

White wins by 1 point

W1 takes away Black's potential eye in the center, setting up an eventual sente for White against Black's group. Black can do no better than to respond with B2 and B4 right away.

[Diagram]

Variation 1

B8 is urgent, a 2-point reverse sente. (If W8, Black must respond at a to live.)

White still wins by 1.

[Diagram]

Variation 2

(Starting after WC.)

If B7 at B10, W9 kills.

White still wins by 1.

[Diagram]

Jigo

The sente, W1 - B2, is tempting, but is aji keshi, securing 2 eyes for Black and reducing the value of White's plays on the right side and in the center.[1]

W3 is now best, but after B4 the top and right sides are miai, to be shared equally. All White can get now is jigo.

(W1 - B2 is a losing sente, losing 1/32 point on average. Usually such a small error will cost nothing in the end, but this is a problem. ;-))


Authors:

Composed by Bill Spight.

Solution found by LukeNine45.


[1]

Inspired by an inaccuracy in [ext] http://www.yomiuri.co.jp/igo_e/281.htm , where the aji keshi did not cost a point.


This is a copy of the living page "BeginnersEndgameExercise5/Solution" at Sensei's Library.
(OC) 2005 the Authors, published under the OpenContent License V1.0.
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