Author: blass uri
Date: 09:38:57 01/11/99
Go up one level in this thread
On January 11, 1999 at 12:17:35, Laurence Chen wrote: >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??? Junior5 can find 2.Nxe7+ It needs some minutes to reject Qxc7. I hope Amir Ban will improve the extensions of Junior5 but unable to find is not the exact descreption. Uri
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