Author: Len Eisner
Date: 18:48:29 12/20/99
Go up one level in this thread
On December 20, 1999 at 21:14:48, Gustavo Pereira wrote: >On December 20, 1999 at 17:53:06, Len Eisner wrote: > >>On December 20, 1999 at 16:52:07, Torstein Hall wrote: >> >>>On December 19, 1999 at 20:10:59, Len Eisner wrote: >>> >>>>In the following endgame position, Fritz 6 plays f7?? I know this is the >>>>tablebase at work but it seems strange to me. And after …a2, Fritz 6 plays >>>>Kg2?? which also look weird. Then after Black queens the pawn with a1-Q, Fritz >>>>6 goes out of the table base and plays f8=q which is only good for a draw >>>>according the Thompson database on the Fritz 5 CD. If I had the Nalimov QPvsQ >>>>tablebase, Fritz 6 would have played g8=q and won. But that table base does not >>>>come with the program. >>>> >>>>I created this position to test the table base. It did not arise in an actual >>>>game. >>>> >>>>wKg1,Pf6,g7/bKb5,Pa3 >>>> >>>>Len >>> >>>Strange, My F6 plays g8Q, says that its check mate in 7 and do not hit the >>>tablebase at all. Are you sure you not are playing in sparring mode, friend mode >>>or other weak mode? >>> >>>Torstein >> >>My Fritz 6 plays f7 in analysis mode and announces mate in 13! If I set it for >>the long game level 40/40 it moves immediately and announces mate in 25! >> >>I have the tablebases from Hiarcs 7.32 loaded on my hard drive. I'm not >>actually using the ones that came on the F6 CD. I wonder if that could account >>for the difference. >> >>Len > >Are you sure all the tablebases for 5 pieces are present in your drive? >If they are not that may explain the problem. >If you use tb's it is much better if you have all the 5 pieces tb's, not just a >set of them. I only have the 5 piece tablebases that are included on the Hiarcs 7.32 and Fritz 6 CDs. The other 5 piece tablebase files are too large to download over a dial up connection. I ordered the Turbo Endgame 4 CD set from Chessbase, but even that only has the "most important" 5 piece endings. I should have it in about a week according to Chessbase. In any case, the position I mentioned should be covered by the KPP vs KP 5 piece tablebase which I do have loaded. So I don't know why Fritz 6 (and H7.32 for that matter) plays f7 since it is obviously not the fastest winning line. I'm also curious why Torstein's Fritz 6 does not even attempt to look up the position in the tablebase since he has it loaded. Once again, here's the position: wKg1,Pf6,g7/bKb5,Pa3 Len
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