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.
On Fri, Aug 14, 2009 at 12:56 PM, Nick Wedd <[email protected]> wrote: > In message <18d95a4b0a2748e39855f882ed6ce...@inspirone1705>, Brian > Sheppard <[email protected]> writes > >> 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: >> > > What rules are you using? What is the komi? > > Nick > > 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 >> [email protected] >> http://www.computer-go.org/mailman/listinfo/computer-go/ >> > > -- > Nick Wedd [email protected] > > _______________________________________________ > computer-go mailing list > [email protected] > http://www.computer-go.org/mailman/listinfo/computer-go/ >
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