Author: Uri Blass
Date: 06:02:20 09/16/01
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On September 16, 2001 at 07:52:45, Peter Berger wrote: >Very interesting and deep analysis. > >A few additional notes: > >1.) The Fritz mainline probably simply transposes: > >19.Qf1 Nxe4 20.Qf4 cxb2 21.Rh5 Nf6 22.Rh6 Ne4 23.Qf5 Ng5 24.Qg4 Be4 25.h4 + - > >2.) Fritz has no clue this position can be won. > >Its decision is obviously based on the easy draw it can get in this line. > >3.) I suspect many programs will see the possible draw after a long search - >1.Qf2 should be just as good as 1.Qf1. I am not sure about it. After Qf2 black can play Ng4 and not Nxe4. Fisher suggested also Ng4 in the book but the difference is that after Qf1 Ng4 the queen does not need to move. Deep Fritz also found Qf2 but later prefered Qf1 because it did not like Qf2 Ng4. I also do not like Der bringer decision for another reason. Der bringer could see Qf1 Nxe4 Rh5 in it's main line. It means that Der bringer does not believe at depth 14 that Qf1 Nxe4 Qf4 is the best for white. It means that after Qf2 Nxe4 it does not need to analyze Qf4 because Qf4 is illogical move based on the fact that white can get the same position in the main line. I guess that the reason is that Qf2 Nxe4 is extended for more plies because after Qf2 Nxe4 threats the queen and encourages the computer to extend more plies. Uri > >Some output of "Der Bringer" on Athlon 1.33: > >0:12:41.2 (14/41) 195699042 -0.27 Rg5 Rxf7 (Mat=-235,50=0) >0:16:14.3 (14/42) 253463460 -0.26 Qf1 (Mat=-135,50=1) >0:19:53.3 (14/42) 316068616 -0.16 Qf1 Nxe4 Rh5 (Mat=-235,50=1) >0:32:02.6 (14/44) 511646825 -0.15 Qf2 (Mat=-135,50=1) >0:35:39.2 (14/44) 571380871 0.00 Qf2 Nxe4 Qf4 (Mat=-235,50=1) >0:47:09.2 (15/47) 760060287 0.00 Qf2 Nxe4 (Mat=-235,50=0) > >Regards, >pete
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