Endgame Problem 4 / Solution

Sub-page of EndgameProblem4
Black to play  

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

White komaster  

When White is komaster B1 saves the black+circle stones. Later, W4 - B5 is sente. (Somewhat sneakily, Wa instead is also sente. ;-)) Then a, b, c, and d are miai, played as dame or ko threats.

Black komaster  

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

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.)

Endgame Problem 4 / Solution last edited by Unkx80 on November 30, 2004 - 10:11
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