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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  1920.5    2800  68.6  1121  1599   80  57.1    3720     100
   2 Reckless 0.8.0       :    3811      8  1735.5    2800  62.0   882  1707  211  61.0    3723     100
   3 Obsidian 16          :    3776      8  1595.0    2800  57.0   749  1692  359  60.4    3726      99
   4 PlentyChess 6.0.0    :    3763      7  1543.0    2800  55.1   682  1722  396  61.5    3727     100
   5 Alexandria 8.1.0     :    3733      7  1417.5    2800  50.6   554  1727  519  61.7    3729      77
   6 Viridithas 18.0.0    :    3729      8  1400.5    2800  50.0   518  1765  517  63.0    3729      63
   7 Clover 9.0           :    3727      7  1393.0    2800  49.8   510  1766  524  63.1    3729      50
   8 Caissa 1.23          :    3727      7  1393.0    2800  49.8   504  1778  518  63.5    3729      58
   9 Stormphrax 7.0.0     :    3726      7  1388.5    2800  49.6   514  1749  537  62.5    3730      56
  10 Berserk 13           :    3725      7  1385.0    2800  49.5   502  1766  532  63.1    3730      98
  11 Integral V7          :    3715      7  1341.5    2800  47.9   474  1735  591  62.0    3730     100
  12 Horsie 1.1           :    3678      7  1186.0    2800  42.4   345  1682  773  60.1    3733      91
  13 pawnocchio 1.8       :    3670      7  1155.5    2800  41.3   312  1687  801  60.3    3734     100
  14 Halogen 15           :    3652      7  1083.0    2800  38.7   284  1598  918  57.1    3735      82
  15 Motor 0.9.0          :    3647      8  1062.5    2800  37.9   239  1647  914  58.8    3735     ---

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

  White wins: 7'919 (37.7%)
  Black wins: 271 (1.3%)
  Draws: 12'810 (61.0%)
  White score: 68.2%

  Updated: 2025-09-04