Author: Laurence Chen
Date: 09:17:35 01/11/99
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On January 11, 1999 at 12:04:51, Laurence Chen wrote: >On January 10, 1999 at 05:41:13, blass uri wrote: > >> >>On January 10, 1999 at 01:32:03, Len Eisner wrote: >> >>>I reached this position in a game against Junior 5 and Junior played hxg? which >>>loses to Qf5!. How did Junior miss fxg holding the position? It seems like an >>>obvious tactical mistake. >>> >>>1rq1r1k1/2p1bpp1/p1Qp4/3Np3/1PP3b1/P2PP1p1/3B1P1P/R1R3K1 w - - 0 1 >>> >>>Len >> >>Qf5 is not an easy move for computer programs. >> >>Fritz5.16 cannot needs almost a minute to find Qf5 on my pentium200MMX and does >>not see it as an advantage for black when it finds it. >> >>Fritz5 and Junior4.6 prefer fxg but not because they see Qf5. >That's because there is no forced moves in this position. And the reason why >chess engines do not find or evaluate any advantage to Qf5 for Black is because >White does not need to play Qxc7?? which is a very bad move, also it has to do >with the pruning of the chess engine to guess what move his opponent will play >next, and the choice of moves are too large. As the position unfolds the chess >engine is able to understand more of the position, and the reason of the change >of the evaluation. >Fritz 5.32 (P200 MMX, 32 MB Hash) after 6 minutes of evaluating the position >after 1. hxg3 gives the following: >0.22 1. ... Qf5 2. f4 Qxd3 3. Be1 Rbc8 4. Bf2 exf4 5. exf4 Bf3 6. Nxe7+ >After 9 minutes: >0.00 1. ... Qf5 2. f4 Qxd3 3. Be1 Rbc8 4. Bf2 exf4 5. exf4 Bf3 6. Re1 By the way after 1. hxg3 Qf5, Fritz 5.32 gives the following: 0.34 2. Nxe7+ Rxe7 3. Qh1 e4 4. c5 Bf3 5. Qh4 Re6 6. cxd6 cxd6 So it seems that 1. ... Qf5 is not winning for Black. Black is a pawn down, and because of the opposite color bishops the game might end up in a draw with the best play of both sides. I hope that Amir Ban will look at this position again, and perhaps find an improvement for Junior 5. It is interesting to note that Junior is unable to find this continuation, and it prefers the dreadful move 2. Qxc7???
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