Brian, I'm not sure if I'm going cross-eyed looking at your position, but if C2 initially then I think the white capture at D3 works. Whatever black does next at the top, white plays H2 and should win?
Christian On 28 August 2010 04:10, Brian Sheppard <[email protected]> wrote: > Here is the position again: > > 1 2 3 4 5 6 7 8 9 > A - - - - X - - - - > B - - - O X - O O - > C - - - O X - O X O > D - X - O X X O X - > E - O X O X O X - X > F - - O - X O X X X > G - - - - X O O O O > H - - - X X X O - - > J - - - - - O O - - > X to play > > It turns out that the right-hand side is a tough problem for O > after X's toughest attack, which I think is C2! > > I have a best-play sequence: > > X C2 > O B2 > X F2 > O D3 > X E1 > O G2 > X E3 > O H3 > X E2 > O F4 > X B3 > O A3 > X C3 > O A4 > X J2 > O C1 > X G1 > O H1 > X A2 > O A1 > X J3 > O G4 > X H2 > O F1 atari > > 1 2 3 4 5 6 7 8 9 > A O - O O X - - - - > B - O X O X - O O - > C O X X O X - O X O > D - X O O X X O X - > E X X X O X O X - X > F O X O O X O X X X > G - O - O X O O O O > H O X O X X X O - - > J - X X - - O O - - > > But note an interesting thing here: O is winning on the left by just > one tempo, and there is a Ko. Since O is also winning on the right > by just one tempo, if he needs a ko to win the left, then he will > lose the game. > > Is it possible that X wins here? > > _______________________________________________ > Computer-go mailing list > [email protected] > http://dvandva.org/cgi-bin/mailman/listinfo/computer-go >
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