Author: Uri Blass
Date: 02:48:54 11/28/01
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On November 27, 2001 at 20:04:44, Mike S. wrote: >On November 27, 2001 at 19:56:32, ALI MIRAFZALI wrote: > >>On November 27, 2001 at 19:51:03, Mike S. wrote: >> >>>(...) > >>>New game - Fritz 7 >>>r1b2rk1/pppp1ppp/2n5/3B4/2Q5/4q2N/PPP4P/1K1R1R2 b - - 0 1 >>> >>>Analysis by Fritz 7: >>> >>>17...Qxh3 18.Bxf7+ >>> -+ (-2.60) Depth: 7/25 00:00:00 136kN >>> ± (1.25) Depth: 12/40 00:02:57 64690kN > >>Are you saying that the first version sticks with 17...Qxh3??? after 5 or >>10 seconds? Please explain > >The lines above are copied & pasted from the engine output of the first Fritz 7 >engine version. Qxh3 is chosen from the beginning (00:00:00) and kept for >several minutes; it switches to another move after some more minutes. 7a doesn't >consider Qxh3 as pm. > >I cannot explain more. Probably an engine bug which was fixed. > >Regards, >M.Scheidl I can explain If you use only material evaluation you can find that after Qxh3 white has a queen for rook knight and pawn. You also can find that without Qxh3 black is two pawns up but all the white pieces are prepared against the black king so you can evaluate the king attack of white as more than 2 pawns and prefer Qxh3 if you believe that after sacrificing the queen for a rook and a knight white has not enough material for attack. It is simply a question of evaluating positional factors and I guess that the first Fritz7 was wrong in that case. Uri
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