Author: Vincent Setterholm
Date: 14:16:30 06/11/00
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On June 11, 2000 at 06:51:09, Enrique Irazoqui wrote: >On June 11, 2000 at 05:12:03, Vincent Setterholm wrote: > >>On June 11, 2000 at 03:44:10, Vincent Setterholm wrote: >> >>>I was running Chessbase 7 with Fritz 6a running analysis. I have the Endgame >>>Turbo CD's installed on my harddrive. I ran into a three piece endgame position >>>where Fritz gave really messed up analysis. >>> >>>Black king on c1. White king on C3. White rook on a5. White to move. Ra1 is >>>mate. >>> >>>Fritz called that position a mate in three. The move before this one Fritz >>>correctly called a mate in 2, but once the proper moves were made, its analysis >>>got all goofy. >>> >>>When I go directly into Fritz (not in Chessbase) I cannot duplicate this >>>problem. It sees Ra1 right away. >>> >>>Any ideas as to what is going on? >>> >>>Thanks! >> >>I was incorrect when I stated that Fritz called the above position Mate in 3. >>It calls the possition a mate in 2, when if you follow it's suggested move, it >>is actually a mate in 3. >> >>But it gets worse. The following is a transcript of a variation I played out, >>following Fritz's best reccommendation for moves: >> >>1. Rb5 Kd1. >>2. Re5 Kc1. >>3. Rd5 Kb1. >>4. Ra5 Kc1. >>5. Rb5 Kd1. >>6. Re5 Kc1. >>7. Rd5 Kb1. >>8. Ra5 Kc1. >>9. Rb5 Kd1. >>10. Re5 Kc1. >>11. Rd5 Kb1. >>12. Ra5 Kc1. >>13. Rb5 Kd1. >>14. Re5 Kc1. >>15. Rd5 Kb1. >>16. Ra5 Kc1. >> >>Fritz NEVER went in for the kill. It just kept seeing mates 2 moves out. >> >>Black can draw by threefold repetition or by the 50 move rule! >> >>Anyone have ideas as to what's happening here? >> >>>Vince. > >With your same setup (CB7, Turbo CDs and F6a), I can't reproduce your problem. I >get +-(Mate in 1) 1.Ra1# (0:00:00) depth 2/2. > >Enrique What seems to be happening to me is that Fritz' analysis while playing one side is correct, where when it becomes the next players turn, the analysis is incorrect. I just analyzed another game where White could draw by perpetual check. Fritz saw white's potential for draw when it was White to play, and correctly evaluated the position as =0.00, but when it became black's turn, the eval shifted to -2.22 even though white had played the correct move. Once black makes his best move, the analysis shifted back to =0.00. Any ideas on that one?
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