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SomeEndgameProblem4

 

Some endgame problem 4 / Solution
Sub-page of SomeEndgameProblem4

[Diagram]
Black to play

This position is hyperactive. Correct play depends on the ko threat situation.

[Diagram]
White komaster

When White is komaster B1 saves the BC stones. Later, W4 - B5 is sente. (Somewhat sneakily, Wa instead is also sente. ;-)) Then a, b, c, and d are miai.


[Diagram]
Black komaster

When Black is komaster he can play more enterprisingly, with B1 - B3.


[Diagram]
Black komaster (ii)

That leaves behind a large throw-in ko at W1. But Black takes first with B2, forcing W3. Now B4 saves his stones. White still has a sente ko with W1 - Ba. (Since Black is komaster, White will avoid this ko.)



This is a copy of the living page "Some endgame problem 4 / Solution" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.