Hi Go Fast, A simple solution to this sitaution is:
When the forbidden selfatari (also an atari) of the bottom-down 3 stones is detected, then try to atari White's string from its the other liberty point, which is the one you want. Aja I have one test case similar as following diagram. All other places are mostly settled, except the bottom three string. O O X X X O O O X X O O O X . . . X . O O . X . - - - - - - - - In most cases, StoneGrid's playout ends up with the left bottom corner being killed. With self-atari analysis, either side will not play self atari moves, which is right behavior. However, without analysis on the 3-lib string, the chance for the black to find the right move in the random playout is very small. It is far less than 1/2. As when black plays randomly at one of its two outside libs, it will bring the white to play around it, and end up with black being killed.
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