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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  1903.5    2800  68.0  1090  1627   83  58.1    3725     100
   2 Reckless 0.8.0       :    3815      8  1733.5    2800  61.9   879  1709  212  61.0    3728      98
   3 PlentyChess 7.0.0    :    3803      7  1687.0    2800  60.3   856  1662  282  59.4    3729     100
   4 Obsidian 16          :    3777      8  1581.0    2800  56.5   725  1712  363  61.1    3730     100
   5 Alexandria 8.1.12    :    3747      7  1455.5    2800  52.0   585  1741  474  62.2    3733      96
   6 Clover 9.1           :    3736      8  1413.0    2800  50.5   515  1796  489  64.1    3733      85
   7 Stormphrax 7.0.0     :    3730      7  1388.0    2800  49.6   513  1750  537  62.5    3734      73
   8 Viridithas 18.0.0    :    3727      7  1374.0    2800  49.1   493  1762  545  62.9    3734      51
   9 Caissa 1.23          :    3727      8  1373.5    2800  49.1   496  1755  549  62.7    3734      66
  10 Berserk 13           :    3725      7  1364.0    2800  48.7   481  1766  553  63.1    3734      93
  11 Integral V7          :    3717      7  1332.5    2800  47.6   465  1735  600  62.0    3735     100
  12 Horsie 1.1           :    3677      7  1165.5    2800  41.6   338  1655  807  59.1    3738      90
  13 pawnocchio 1.8       :    3669      8  1137.0    2800  40.6   292  1690  818  60.4    3738     100
  14 Halogen 15           :    3649      8  1054.5    2800  37.7   261  1587  952  56.7    3740      78
  15 Motor 0.9.0          :    3645      8  1037.5    2800  37.1   230  1615  955  57.7    3740     ---

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

  White wins: 7'931 (37.8%)
  Black wins: 288 (1.4%)
  Draws: 12'781 (60.9%)
  White score: 68.2%

  Updated: 2025-11-11