TOP 20:
# PLAYER : RATING ERROR POINTS PLAYED (%) 1 Stockfish 15.1 : 3692 34 5221.5 6840 76.3% 2 Berserk 11.1 : 3586 36 1810.5 3419 53.0% 3 Koivisto 9.0 : 3535 36 607.0 1520 39.9% 4 Rebel 16 : 3483 38 278.0 652 42.6% 5 Slowchess 2.8 : 3453 47 219.0 340 64.4% 6 Rubichess 2021 NNUE : 3432 53 75.5 136 55.5% 7 Seer 2.5 : 3392 37 706.0 1344 52.5% 8 Minic 3.30 : 3345 35 673.5 1480 45.5% 9 Arasan 23.3 NNUE : 3313 43 129.5 340 38.1% 10 Black Marlin 7 : 3312 35 694.0 1860 37.3% 11 Fire 8.1 : 3302 37 321.5 612 52.5% 12 Komodo 13.02 : 3296 38 320.5 924 34.7% 13 Igel 3.05 : 3293 34 798.0 1496 53.3% 14 Pedone 3.1 : 3291 35 591.5 952 62.1% 15 Ethereal 13 classic : 3273 38 249.0 408 61.0% 16 Xiphos 0.6 : 3207 39 216.5 408 53.1% 17 Rofchade 2.3 : 3157 39 220.0 476 46.2% 18 Booot 6.5 : 3133 40 152.0 408 37.3% 19 Laser 1.7 : 3130 33 499.0 908 55.0% 20 Lc0 0.29dev 791982 : 3124 45 127.0 340 37.4%
Update: Berserk 11.1 and Koivisto 9.0 have been added. Additionally, I have started to retest all engines with a broader suite of openings (190 openings at a depth of 2-ply). This may cause some initial imbalances for some engines, which will be gradually corrected as the engines are retested with the new opening suite.
Click here to download the complete rating list:
The rating list is updated to 26/02/2023, it is calculated with Ordo and it is based on the following assumptions.
- The Elo score of Rebel 6 UCI version is fixed at 2470, therefore it acts as an “anchor” for all the other engines. I calculated this score as the average between results obtained by the engine againsts humans players in the ’90, with the sources I was able to recover in Internet (Talkchess.com, Rebel14.nl, forums…).
- Besides Rebel 6, Fritz Brains in Bahrain is also used, at a speed of 3500 kN/s, with its rating fixed at 2800 elo.
- Time for each match has been fixed to 40 moves/120 minutes repeated, calibrated on a Pentium 90 processing power. The processing power has been emulated, after estimation by using benchmarks with real P90 results. Accordingly, on modern PC the effective match time was fixed to 40 moves/125” or 40/130” depending on the PC used for the test, with expected results similar to blitz matches. For some chess engines, such as for example Chess Titans, it was not possible to define the same match time; for this reason, I have shown for this engine, the characteristic of the PC used.
- The opening suite consists of 190 positions, which are repeated for each engine (each engine plays each opening one as white, and one as black). For older engines, which do not uses standard UCI of XBoard interfaced (such as Battlechess for example), I’ve reproduced by hand the moves as indicated by the programs. The time for this engines has been calibrated on the processing power of a Pentium 90 as well. For all this reasons, the number of match of these engines are few, and based on random selection of the 34 opening positions. The opening suite is downloadable here.
- All the tested chess engines are freely downloadable from Intenet, except for the programs I’ve bought myself years ago, and are all limited to 1 core.
- Only the best version of Stockfish is shown in the “Top 10”, I’ve removed all derivatives (such as Shashchess for example). In the full rating list I’ve included them all (past SF versions, derivatives, clones…).
- The main goal of this rating list, made for my exclusive enjoyment, was to estimate the level of play of modern engines, with respect to the older ones, but also to evaluate the actual playing strenght of many engines I loved in my youth (the already cited Battleches, for example).