Author: Mike S.
Date: 11:22:33 07/02/01
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
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