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  • 2.3.1
  • 4d2a583
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@vshcherbyna vshcherbyna released this Jan 14, 2020

What's new:

  • Re-write the root search routine
  • Re-write aspiration loop with a smaller aspiration window
  • Do not cutoff qsearch on pv moves in qsearch
  • Handle repetitions at the qsearch entance
  • More strict pruning conditions for quiet moves
  • Proper way to pass position to child threads in SMP mode to handle repetitions
  • Unified condition to killer moves as non-tactical moves
  • Perft tests for six different positions

Regression run against top 50 engines in tc=all/60+0.6:

Rank Name                          Elo     +/-   Games   Score   Draws
   0 Igel 2.3.1 64 POPCNT         -104      13    2000   35.4%   32.5%
   1 Stockfish 10 64 POPCNT        576     160     100   96.5%    7.0%
   2 Fire 7.1 x64 popcnt           346      71     100   88.0%   24.0%
   3 Ethereal 11.75 (PEXT)         338      70     100   87.5%   25.0%
   4 Xiphos 0.6 BMI2               323      74     100   86.5%   23.0%
   5 Defenchess 2.2 x64            241      65     100   80.0%   28.0%
   6 Laser 1.7                     235      64     100   79.5%   29.0%
   7 rofChade 2.202 BMI            210      54     100   77.0%   40.0%
   8 RubiChess 1.6                 186      54     100   74.5%   41.0%
   9 Andscacs 0.95                 168      59     100   72.5%   33.0%
  10 Pedone 2.0                    123      52     100   67.0%   44.0%
  11 Nemorino                       81      55     100   61.5%   37.0%
  12 Arasan 22.0                    78      51     100   61.0%   46.0%
  13 Deep iCE 4.0.853 x64/popcnt    63      52     100   59.0%   42.0%
  14 Texel 1.07                     63      54     100   59.0%   38.0%
  15 Strelka 5.5 x64                60      50     100   58.5%   47.0%
  16 Protector 1.9.0                53      57     100   57.5%   33.0%
  17 Vajolet2 2.8.0                 49      53     100   57.0%   40.0%
  18 Winter 0.7 BMI2              -143      63     100   30.5%   25.0%
  19 zurichess neuchatel          -164      56     100   28.0%   38.0%
  20 GreKo 2018.08                -382     105     100   10.0%   10.0%
Finished match
Assets 3
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