Author: William Penn
Date: 21:36:53 02/19/04
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On February 19, 2004 at 15:11:20, Uri Blass wrote: >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 Thanks for the info. I hope you are right! Incidentally, what are "2 best mode" and "1 best mode"? I'm not familiar with those terms. WP
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