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
I analyzed this position as a loss for O, as follows: O has 22 points at left, and will gain 1 point from F4/G4/H4 O has 13 points at right, with a Ko to potentially gain 2 O has two ways to win: the Ko on J6/J7, or gain two of F4/G4/H4 Since H4 is sente for X, O should start with H4. This looks winning for O because O will gain another point from F4/G4. Unfortunately, X can win both F4 and G4 by using his doomed stones on F2. Some variations: J2-J3-F1-E1-F4-G1-G4, and J2-F1-G1-E1-F4-J3-G4. If H4 does not win, then O must start his ko immediately with J6. X has ko threats with H9, H4, E1 (or F1). O has Ko threats with A4 and then A2 and H4 (which threatens to win by taking *two* of the dame from F4/G4/H4. Since X has more ko threats, it seems like O should not win. Extensive simulations supported this theory. But now I have a new version of Pebbles, and it says that O should win. What do you think? _______________________________________________ computer-go mailing list computer-go@computer-go.org http://www.computer-go.org/mailman/listinfo/computer-go/
