Author: Drexel,Michael
Date: 07:25:11 12/31/02
Go up one level in this thread
On December 31, 2002 at 10:06:28, Uri Blass wrote: >On December 31, 2002 at 09:58:28, Bob Durrett wrote: > >>On December 31, 2002 at 09:33:06, Uri Blass wrote: >> >>>On December 31, 2002 at 09:01:55, Bob Durrett wrote: >>> >>>>In the following position, with Black to move, Fritz 8 says the correct move is >>>>Re8. It gives a position evaluation of 0.00 >>>> >>>>5r1k/pp1p2pp/n4q2/2pB4/2P2r2/8/PP2QPPP/R4RK1 b - - 0 18 >>>>wKg1,Qe2,Bd5,Ra1,f1,Pa2,b2,c4,f2,g2,h2/bKh8,Qf6,Na6,Rf4,f8,Pa7,b7,c5,d7,g7,h7 >>>> >>>>I forgot how to display the position here. Maybe someone will do it for me. >>>> >>>>Bob D. >>> >>>Can you post the relevant game. >> >>I absolutely guarantee that you don't want to see the relevant game. It was one >>of my 60+ blitz 2 12 ICC games which I played recently, after years of >>inactivity, for the purpose of determining how much my game had deteriorated. >>The game is filled with big errors on both sides. >> >>> >>>Maybe Re8 force repetition of the position so Fritz prefers repetition and not >>>negative evaluation(of course in that case white made an horrible blunder in a >>>previous move). >> >>If you will look at the position, you will see that there is no chance for a >>draw by repetition of the position. But your idea does sound right. Fritz must >>have gone into a mode where it "thought" there was a repetition of the position. >> Maybe there is an unintended jump to that "repetition of position display" >>subroutine or function which occurs improperly sometimes. >> >> >>> >>>A lot of programs evaluates first repetition as a draw. >>>It may be wrong in analysis but in games it is usually no problem. >> >>This jumped out at me in post-mortem analysis. Strangely, my opponent in the >>actual game also played Re8?? and I, shamefully [!!!], failed to capture the >>rook. Maybe this has something to do with the bug. > >In that case it is not a bug because most programs are designed to assume that >second repetition is a draw in the analysis. > >A bug is something that the programmer did not mean to happen. > >I admit that there may be cases when it is not a draw but there are more >important things to improve than this problem that is not easy to solve in a >productive way(solutions may generate other problems like not seeing a draw by >repetition or not trying to make progress and often repeating a previous >position). > >Uri Chessbase should know that most chessplayers are using Fritz for Analysis. Fritz engines often used the famous X piece in analysis mode. In my opinion Fritz engines are simply bad analysis engines. Shredder 7 does not show 0.00 in case I repeat moves in this position. it shows +-(9.94) Qxe8+ even if I repeat the moves 100 times.
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