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Tournament Info
Top15 round-robin tournament of free engines only, using Stefan Pohl's unbalanced 3-move book Chess324xxl_big+090_+119.pgn played reversed sides per pairing.

Time Control: game in 2 minutes plus 1 second increment, 2'+1"
Hardware: Intel i7 12700, i9 10900 and AMD Ryzen 5900X (performance roughly equalised via power settings)
CuteChess GUI: Concurrency limited to number of actual cores (P cores in case of i7 12700)
Each engine 512MB hash, 1 thread, ponder off
Each pairing 100 openings
Adjudication: Syzygy 5-men only - no eval based adjudication.
Endgame tablebases: Syzygy 5-men.
Ratings calculated with Ordo.

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   # PLAYER               :  RATING  ERROR  POINTS  PLAYED   (%)     W     D    L  D(%)  OppAvg  CFS(%)
   1 Stockfish 17.1       :    3859      8  1916.0    2800  68.4  1113  1606   81  57.4    3721     100
   2 Reckless 0.8.0       :    3812      8  1737.0    2800  62.0   877  1720  203  61.4    3725     100
   3 Obsidian 16          :    3776      8  1592.0    2800  56.9   745  1694  361  60.5    3727      99
   4 PlentyChess 6.0.0    :    3764      7  1540.5    2800  55.0   675  1731  394  61.8    3728     100
   5 Clover 9.1           :    3736      7  1424.5    2800  50.9   530  1789  481  63.9    3730      67
   6 Alexandria 8.1.0     :    3734      7  1414.5    2800  50.5   552  1725  523  61.6    3730      83
   7 Caissa 1.23          :    3728      8  1392.5    2800  49.7   504  1777  519  63.5    3731      50
   8 Viridithas 18.0.0    :    3728      7  1392.5    2800  49.7   506  1773  521  63.3    3731      53
   9 Stormphrax 7.0.0     :    3728      8  1390.5    2800  49.7   515  1751  534  62.5    3731      65
  10 Berserk 13           :    3726      7  1381.5    2800  49.3   499  1765  536  63.0    3731      97
  11 Integral V7          :    3716      7  1340.0    2800  47.9   468  1744  588  62.3    3732     100
  12 Horsie 1.1           :    3678      7  1185.0    2800  42.3   349  1672  779  59.7    3734      90
  13 pawnocchio 1.8       :    3672      7  1157.0    2800  41.3   315  1684  801  60.1    3735     100
  14 Halogen 15           :    3653      8  1081.5    2800  38.6   280  1603  917  57.3    3736      88
  15 Motor 0.9.0          :    3646      7  1055.0    2800  37.7   239  1632  929  58.3    3737     ---

  Total: 21'000 games played by 15 programs (games available on request)

  White wins: 7'896 (37.6%)
  Black wins: 271 (1.3%)
  Draws: 12'833 (61.1%)
  White score: 68.2%



  Updated: 2025-09-16