Kyu Exercise 90 / Solution

Sub-page of KyuExercise90

The solution is really easy once you know that (i) the L-group is unconditionally dead, and (ii) B1 turns the position precisely into a L-group where the outside White stones become totally useless. Spotting the B1 move, is however another matter altogether. (For why the L-group is dead, please refer to the L-group page itself.)


What is noteworthy of B1 here is that it prevents White from using the weakness originally present at B1 by playing at either a or b (the latter sets up a throw-in ko at B1). Due to this weakness, all other moves other than B1 fail to kill White unconditionally.

Kyu Exercise 90 / Solution last edited by togo on December 13, 2012 - 01:29
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