Author: Uri Blass
Date: 07:06:28 12/31/02
Go up one level in this thread
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
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