Ratings of chess engines are well established on the known rating lists. Will anything change when we feed engines with only (playable) gambit positions? We carefully created 50 gambit opening positions to find out.
As first step following the established ratings on the CCRL rating list we divide (only active) engines into groups based on their strength and run a robin match. Thus a group of 6 engines will play 500 games each and 1500 games in total. Two time controls CCRL style, 40/2 and 40/15.
As second step with a reasonable number of engines and games we will create a rating list.
Excluded Engines
1. Inactive engines, those engines who haven't been updated for a long time.
2. Known derivatives.
Premier League
40 moves in 2 minutes
No. Engine 1 2 3 4 5 6 7 8 9 Score Games Perc ------------------------------------------------------------------------------------------ 1 Stockfish 13 xxxx 62.0 68.0 79.5 84.5 81.5 86.5 88.5 87.0 637.5 / 800 79.6% 2 Komodo Dragon 38.0 xxxx 53.5 69.0 81.0 76.5 78.0 77.0 80.0 553.0 / 800 69.1% 3 Lc0 v27 32.0 46.5 xxxx 66.0 74.0 70.0 67.0 73.0 72.5 501.0 / 800 62.6% 4 Komodo 14 20.5 31.0 34.0 xxxx 62.5 58.0 58.5 62.0 62.0 388.5 / 800 48.5% 5 RubiChess 2.1 15.5 19.0 26.0 37.5 xxxx 54.0 53.0 56.0 58.0 319.0 / 800 39.8% 6 SlowChess 2.5 18.5 23.5 30.0 42.0 46.0 xxxx 53.5 46.0 55.5 315.0 / 800 39.3% 7 Igel 3.0.5 13.5 22.0 33.0 41.5 47.0 46.5 xxxx 49.5 54.5 307.5 / 800 38.4% 8 Ethereal 12.75 11.5 23.0 27.0 38.0 44.0 54.0 50.5 xxxx 50.5 298.5 / 800 37.3% 9 Igel 3.0.0 13.0 20.0 27.5 38.0 42.0 44.5 45.5 49.5 xxxx 280.0 / 800 35.0%
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40 moves in 15 minutes
No. Engine 1 2 3 4 5 6 Score Games Perc Moves ------------------------------------------------------------------------------------ 1 Stockfish 13 xxxx 58.5 79.5 81.5 79.0 81.5 380.0 / 500 (76.00%) 68.4 2 Komodo Dragon 41.5 xxxx 74.5 77.5 74.5 74.0 342.0 / 500 (68.40%) 78.6 3 Ethereal 12.75 20.5 25.5 xxxx 52.0 55.5 58.0 211.5 / 500 (42.30%) 73.8 4 SlowChess 2.5 18.5 22.5 48.0 xxxx 50.0 57.5 196.5 / 500 (39.30%) 70.8 5 RubiChess 2.1 21.0 25.5 44.5 50.0 xxxx 50.5 191.5 / 500 (38.30%) 73.2 6 Igel 3.0.0 18.5 26.0 42.0 42.5 49.5 xxxx 178.5 / 500 (35.70%) 68.7
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Division One
40 moves in 2 minutes
No. Engine 1 2 3 4 5 6 7 Score Games Perc Moves ----------------------------------------------------------------------------------------- 1 Pedone 3.1 xxxx 54.0 60.5 62.0 70.0 72.0 80.0 398.5 / 600 (66.42%) 64.3 2 Nemorino 6.00 46.0 xxxx 59.5 63.5 55.0 72.0 78.0 374.0 / 600 (62.33%) 69.7 3 Pedone 3.0 39.5 40.5 xxxx 52.5 50.5 61.5 72.0 316.5 / 600 (52.75%) 65.2 4 rofChade 2.3 38.0 36.5 47.5 xxxx 50.0 69.5 73.0 314.5 / 600 (52.42%) 66.7 5 Booot 6.5 30.0 45.0 49.5 50.0 xxxx 68.5 70.0 313.0 / 600 (52.17%) 66.3 6 Wasp 4.50 28.0 28.0 38.5 30.5 31.5 xxxx 58.5 215.0 / 600 (35.83%) 69.3 7 Arasan 2.22 20.0 22.0 28.0 27.0 30.0 41.5 xxxx 168.5 / 600 (28.08%) 63.9
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Division Two
40 moves in 2 minutes
No. Engine 1 2 3 4 5 6 7 Score Games Perc Moves ---------------------------------------------------------------------------------------- 1 Halogen 10 xxxx 53.5 64.5 58.0 62.0 64.0 70.0 372.0 / 600 (62.00%) 61.9 2 Minic 3.04 46.5 xxxx 53.0 64.0 55.5 57.0 71.5 347.5 / 600 (57.92%) 61.8 3 Marvin 5.0 35.5 47.0 xxxx 51.0 58.0 54.5 68.5 314.5 / 600 (52.42%) 58.7 4 Stash 29.0 42.0 36.0 49.0 xxxx 50.5 55.5 61.5 294.5 / 600 (49.08%) 66.0 5 Orion 0.8 38.0 44.5 42.0 49.5 xxxx 56.0 63.0 293.0 / 600 (48.83%) 62.8 6 Vajolet2 2.8 36.0 43.0 45.5 44.5 44.0 xxxx 70.5 283.5 / 600 (47.25%) 64.9 7 Amoeba 3.3 30.0 28.5 31.5 38.5 37.0 29.5 xxxx 195.0 / 600 (32.50%) 59.9
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Division Three
40 moves in 2 minutes
No. Engine 1 2 3 4 5 6 7 8 Score Games Perc ----------------------------------------------------------------------------------------- 1 Seer 2.0.0 xxxx 52.0 61.5 62.0 70.5 60.0 64.0 66.5 436.5 / 700 (62.36%) 2 Weiss 1.3 48.0 xxxx 61.5 68.5 53.5 58.0 68.5 71.5 429.5 / 700 (61.36%) 3 Topple 0.8.0 38.5 38.5 xxxx 52.5 48.5 52.5 54.5 60.0 345.0 / 700 (49.29%) 4 Counter 3.7 38.0 31.5 47.5 xxxx 56.0 56.5 47.0 60.0 336.5 / 700 (48.07%) 5 Seer 1.2.1 29.5 46.5 51.5 44.0 xxxx 51.0 52.5 57.5 332.5 / 700 (47.50%) 6 Cheng 4.41 40.0 42.0 47.5 43.5 49.0 xxxx 51.5 58.5 332.0 / 700 (47.43%) 7 FabChess 1.16 36.0 31.5 45.5 53.0 47.5 48.5 xxxx 56.0 318.0 / 700 (45.43%) 8 Cheng 4.40 33.5 28.5 40.0 40.0 42.5 41.5 44.0 xxxx 270.0 / 700 (38.57%)
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Division Four
40 moves in 2 minutes
No. Engine 1 2 3 4 5 6 Score Games Perc Moves ----------------------------------------------------------------------------------- 1 Berserk 3.3.0 xxxx 50.0 54.0 74.5 74.5 85.0 338.0 / 500 (67.60%) 64.5 2 Tucano 9.0 50.0 xxxx 49.5 71.5 80.0 85.0 336.0 / 500 (67.20%) 64.9 3 Mr Bob 1.0.0 46.0 50.5 xxxx 68.0 78.0 85.0 327.5 / 500 (65.50%) 62.0 4 Cheese 2.2 25.5 28.5 32.0 xxxx 52.5 58.5 197.0 / 500 (39.40%) 65.6 5 ProDeo 3.1 25.5 20.0 22.0 47.5 xxxx 59.5 174.5 / 500 (34.90%) 67.2 6 ProDeo 3.0 15.0 15.0 15.0 41.5 40.5 xxxx 127.0 / 500 (25.40%) 63.6
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Division Five
40 moves in 2 minutes
No. Engine 1 2 3 4 5 6 Score Games Perc Moves ----------------------------------------------------------------------------------- 1 Benjamin xxxx 52.5 53.5 59.5 51.5 87.5 304.5 / 500 (60.90%) 65.3 2 k2 099 47.5 xxxx 51.5 50.0 62.0 85.0 296.0 / 500 (59.20%) 67.4 3 Dumb 1.8 46.5 48.5 xxxx 52.5 55.0 84.5 287.0 / 500 (57.40%) 69.7 4 Supernova 2.3 40.5 50.0 47.5 xxxx 53.0 81.0 272.0 / 500 (54.40%) 67.3 5 Fridolin 3.10 48.5 38.0 45.0 47.0 xxxx 87.0 265.5 / 500 (53.10%) 66.8 6 Foxsee 7.8 12.5 15.0 15.5 19.0 13.0 xxxx 75.0 / 500 (15.00%) 55.6