it really isn't so much about that. The reason why strong programs
have to consider very few moves is knowledge applied in the tree

I agree with you.

.OO.
OXXO     snap back
XO.O
.XO.

For example, Aya often took one "O" stone before. It is useless.
I added the feature "Take snap back when there is no ko", its gamma
was 0.009, very low. After that, this move is rarely selected in tree.

Regards,
Hiroshi Yamashita

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