Author: Uri Blass
Date: 12:11:20 02/19/04
Go up one level in this thread
On February 19, 2004 at 14:56:16, William Penn wrote: >On February 19, 2004 at 13:20:46, Timothy J. Frohlick wrote: > >>Mike, >> >>This is only an academic position. It will never occur unless your opponent >>wants you to win. >> >>TJ >> >> >>On February 18, 2004 at 09:54:00, Mike Hood wrote: >> >>>Shredder 8 gives the following information in "infinite analysis" mode, even >>>though I have all the 3/4/5-piece tablebases. >>> >>>[D] 4k3/8/8/8/8/8/3q4/4K3 w - - 0 1 >>> >>>Analysis by Shredder 8: >>> >>>1. = (0.00): 1.Kxd2 >>>2. = (0.00): 1.Kf1 Kf7 >>> >>>We get a small clue what is happening, when we look at Fritz 8's analysis of the >>>same position: >>> >>>Analysis by Fritz 8: >>> >>>1. = (0.00): 1.Kxd2 >>>2. -+ (-10.66): 1.Kf1 Kd7 >>> >>>This is the analysis after 10 seconds. If I wait a few minutes Fritz finds a >>>mate in 11. It looks like the tablebase engine goes on strike in positions which >>>are a potential transition to K-K. > >This a very fundamental and important position, as are the positions where Rook >or Pawn are substituted for the Queen, which are also proven bugs here. These >positions may be very rare in actual games, but will occur frequently in >searches when analyzing endgame positions with the engine. If they are evaluated >incorrectly during those searches, then the best move predicted by Shredder 8 in >endgames may be incorrect. >[Have I got that right?] >WP I did not see a position when shredder evaluated it wrong without tablebases in this discussion. If it is going to probe the tablebases then it is going to probe them earlier so again there is no problem. I also saw the problem only in 2 best mode and in games it is playing in 1 best mode. Uri
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