Author: William Penn
Date: 22:13:46 02/18/04
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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. I verified your result with my Shredder 8 (CB GUI) installation, also that this bug does not occur in other engines which I have available such as Shredder 7.04. So it is unique to Shredder 8. I also verified that it only happens if the tablebases are active, so it is definitely a problem with tablebase utilitization by Shredder 8. I then played around a little... If you replace the Queen with a Rook, the same thing happens. If you replace it with a knight or bishop, nothing happens - Shredder 8 refuses to calculate anything whatsoever! I received a fatal system exception when making these tests, closing the GUI automatically. I then replaced the Queen with a Pawn, and discovered that it refuses to capture the pawn. It doesn't even see that capturing move, so the problem may be more serious than I originally thought. Again, these problems only happen with tablebases active. WP
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