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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      7  2322.0    3400  68.3  1355  1934   111  56.9    3722     100
   2 Reckless 0.8.0           :    3818      7  2132.5    3400  62.7  1123  2019   258  59.4    3724     100
   3 PlentyChess 7.0.0        :    3800      7  2048.0    3400  60.2  1030  2036   334  59.9    3725     100
   4 Obsidian 16.0            :    3778      7  1944.0    3400  57.2   900  2088   412  61.4    3727      94
   5 Viridithas 19.0.1        :    3770      7  1904.5    3400  56.0   854  2101   445  61.8    3727     100
   6 Alexandria 8.1.12        :    3747      7  1789.0    3400  52.6   734  2110   556  62.1    3728      87
   7 Caissa 1.24              :    3742      7  1761.5    3400  51.8   727  2069   604  60.9    3729      84
   8 Clover 9.1               :    3737      7  1738.0    3400  51.1   660  2156   584  63.4    3729      78
   9 pawnocchio 1.9           :    3733      7  1718.5    3400  50.5   665  2107   628  62.0    3729      52
  10 Stormphrax 7.0.0         :    3733      7  1717.0    3400  50.5   679  2076   645  61.1    3729      73
  11 Berserk 13               :    3730      7  1701.5    3400  50.0   652  2099   649  61.7    3729     100
  12 Integral V7              :    3712      7  1615.0    3400  47.5   571  2088   741  61.4    3730     100
  13 Quanticade Cronus 3.0    :    3687      7  1487.5    3400  43.8   491  1993   916  58.6    3732      98
  14 Horsie 1.1               :    3676      7  1435.0    3400  42.2   401  2068   931  60.8    3733     100
  15 Uralochka 3.42a          :    3657      7  1345.5    3400  39.6   372  1947  1081  57.3    3734      50
  16 RubiChess 20250606       :    3657      7  1345.5    3400  39.6   349  1993  1058  58.6    3734      96
  17 Motor 0.9.0              :    3648      7  1301.5    3400  38.3   312  1979  1109  58.2    3734      62
  18 Halogen 15               :    3646      7  1293.5    3400  38.0   335  1917  1148  56.4    3734     ---

  Total: 30'600 games played by 18 programs (games available on request)

  White wins: 11'744 (38.4%)
  Black wins: 466 (1.5%)
  Draws: 18'390 (60.1%)
  White score: 68.4%
  Updated: 2026-01-10