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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  2332.5    3400  68.6  1367  1931   102  56.8    3719     100
   2 Reckless 0.8.0           :    3817      7  2142.5    3400  63.0  1126  2033   241  59.8    3722     100
   3 PlentyChess 7.0.0        :    3801      7  2066.5    3400  60.8  1062  2009   329  59.1    3723     100
   4 Obsidian 16              :    3779      7  1958.5    3400  57.6   919  2079   402  61.1    3724     100
   5 Alexandria 8.1.12        :    3747      6  1798.0    3400  52.9   744  2108   548  62.0    3726      92
   6 Caissa 1.24              :    3740      7  1763.0    3400  51.9   729  2068   603  60.8    3726      64
   7 Clover 9.1               :    3738      6  1754.5    3400  51.6   672  2165   563  63.7    3727      78
   8 pawnocchio 1.9           :    3734      7  1735.5    3400  51.0   681  2109   610  62.0    3727      57
   9 Stormphrax 7.0.0         :    3733      7  1731.0    3400  50.9   691  2080   629  61.2    3727      75
  10 Viridithas 18.0.0        :    3730      7  1714.0    3400  50.4   670  2088   642  61.4    3727      61
  11 Berserk 13               :    3728      7  1707.0    3400  50.2   657  2100   643  61.8    3727     100
  12 Integral V7              :    3713      7  1629.5    3400  47.9   587  2085   728  61.3    3728     100
  13 Quanticade Cronus 3.0    :    3686      6  1498.5    3400  44.1   497  2003   900  58.9    3730      96
  14 Horsie 1.1               :    3677      7  1453.0    3400  42.7   419  2068   913  60.8    3730     100
  15 Uralochka 3.42a          :    3658      7  1358.0    3400  39.9   392  1932  1076  56.8    3731      66
  16 RubiChess 20250606       :    3656      7  1347.5    3400  39.6   350  1995  1055  58.7    3731      92
  17 Motor 0.9.0              :    3648      7  1310.5    3400  38.5   323  1975  1102  58.1    3732      66
  18 Halogen 15               :    3646      7  1300.0    3400  38.2   337  1926  1137  56.6    3732     ---

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

  White wins: 11'755 (38.4%)
  Black wins: 468 (1.5%)
  Draws: 18'377 (60.1%)
  White score: 68.4%

  Updated: 2026-01-07