I checked this position again, and Many Faces finds j3 after a few thousand playouts, but even at a million playouts (28 seconds) it's only 61%.
From: computer-go-boun...@computer-go.org [mailto:computer-go-boun...@computer-go.org] On Behalf Of Brian Sheppard Sent: Saturday, August 15, 2009 8:13 AM To: computer-go@computer-go.org Subject: [computer-go] Interesting endgame case >assuming komi 7.5 and Chinese rule, playing at J3 white will win. After J3, >white has 35. It only needs to win the ko or takes two dames. If black fills >the dame, it loses the ko. If it fills the ko, white can take two dames. Yes, Chinese and 7.5. I basically figured that J3 was just another in a long series of stupid moves by Pebbles, but when it insisted that J3 was winning no matter how long it searched then I decided to look into it. J3 looks stupid because it fills territory that O already owns. J3 wins because it is "reverse sente" (I think this is the right terminology) because H4 is no longer sente for X. It also gains a move in the semeai against X's dead stones on the left, so O gains *two* ko threats. Just curious: how did you find J3? >> 1 2 3 4 5 6 7 8 9 >> A - - O - - - - - - >> B X X X O X - - - - >> C O O X O X X - - - >> D O - O X X - X X - >> E - O O O X X O X X >> F - X O - X O O O X >> G - X O - X O O - O >> H O X O - X X O O - >> J - - - O X - X O - >> O to play
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