Author: Ralf Elvsén
Date: 15:40:58 07/02/01
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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. > >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 Thank you for these data. Do you think the increase in the percentage of occurances is due to higher quality of the programs, i.e. less early wins due to foolish mistakes? Ralf
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