Author: blass uri
Date: 14:13:47 03/16/00
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On March 16, 2000 at 14:02:28, Robin Smith wrote: >On March 15, 2000 at 15:08:36, blass uri wrote: > >>On March 15, 2000 at 14:17:59, Robin Smith wrote: >> >><snippped> >>>In the 13th US correspondence chess championship finals I played a move that my >>>computer NEVER finds. Do any programs find 17.... Qd5! >>> >>>This move prevents white from playing Be4 (which would put presure on b7 and >>>support a possible d pawn push), it frees d8 for blacks rook and it keeps the >>>queen eyeing d5, restraining whites isolated d-pawn. I believe it is the >>>strongest move in the position, but when I reviewed the game with my computer it >>>never finds it even after a very long "think" because of the exchange sac >>>involved. >> >>Did you try to generate a tree with the computer to prove that 17...Qd5 is >>really the best move? > >I don't know how to "prove" that a positional move is best. I do know that it >seems programs reject it out of hand because of a faulty "refutation" ... the >game continuation. Computers always prove that a move is best by a tree. one of the problem of programs is that they do not know to do the right extensions. I can generate a tree and prove by telling programs to give me more than one option that there is no good move out of the tree. I can calculate the best move based on the evaluations after search of the leaves of this tree. If the best move based on these evaluations is Qd5 I see it as a proving tree that Qd5 is best. >>It is clear that after 19.Nb6 white is losing but the question is if white has >>no good alternative before(for example 18.f3) > >18.f3 is maybe better than what white played, but white's exposed king, weak >d-pawn and blacks 2 bishops are very strong strong advantages. Either 18.f3 Rd8 >or 18.f3 Qg5 should give black a winning position. You may be right about f3 I did not analyze f3 for a long time because it was not my game. I got with Junior5.9 a better score for black by 17...g6 relative to 17...Qd5 18.f3 and this was the reason that I suggested this move but I see that the Junior5.9 intends to play the same wrong idea of Qa4 Be7 Nb6 after 18.f3 Rd8 The point is that I cannot be sure that black is winning without analyzing a lot of lines with the computer. Uri
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