Author: Tony Werten
Date: 02:32:12 07/03/01
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On July 02, 2001 at 14:22:33, Mike S. wrote: >I have searched for occurances of endgame database material in computer chess >games (inluding some comp-human, and probably a few human-human games), based on >>12.000 games from 1984 on. I don't think the data is valid. Compared to 1984 almost everyone has tablebases now. If there are 6 pieces on the board and both programs see it enter the tablebases they stop the game. ie the 4 or 5 pieces position is not reached. Without the egtb's the game would have continued. cheers, Tony > >The following table shows the *percentage* of occurances (X = Q/R/B or N): > >years # games P-P X-P X-X PP-P XP-X XX-X total >---------------------------------------------------------- >84-89 305 1,3 0,3 1,0 1,0 3,9 0,3 7,9 >90-95 2646 1,0 1,0 0,9 2,0 4,4 0,9 10,2 >96-98 5335 1,2 3,4 3,6 1,9 9,1 2,3 21,6 >99-2001 4126 1,9 4,4 4,8 2,3 11,0 2,4 26,8 >---------------------------------------------------------- >84-2001 12412 > >As you can see in the total column, db endgame occurances are rising. > >Then, I determined how many plies a XP-X (the most important one) situation was >at the board in each time segment: > >years # XP-X plies: 4- 20- 40- D% >-------------------------------------- >84-89 12 58 25 8 67 >90-95 117 52 16 3 44 >96-98 486 56 24 10 56 >99-2001 454 53 21 9 59 >-------------------------------------- >84-2001 1069 54 22 9 56 > >I see no real trend here, except maybe in the percentage of drawn games (D%), >which *may* be slightly rising (which would mean the defender benefits more from >tablebase use). > >Regards, >M.Scheidl
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