TOP 20:
# PLAYER : RATING ERROR POINTS PLAYED (%) 1 Stockfish 16.1 : 3662 41 2246.5 3418 65.7% 2 Berserk 13 : 3597 39 756.0 1520 49.7% 3 Obsidian 12 : 3550 39 831.5 1900 43.8% 4 Caissa 1.18 : 3534 39 627.5 1522 41.2% 5 RubiChess 20240112 : 3530 39 771.0 1900 40.6% 6 Clover 6.1 : 3520 42 119.0 380 31.3% 7 Seer 2.8.0 : 3510 42 114.5 380 30.1% 8 Alexandria 6.1.0 : 3506 42 112.5 380 29.6% 9 Koivisto 9.0 : 3506 33 1673.5 3420 48.9% 10 Rebel 16.3 : 3491 42 106.0 380 27.9% 11 Slowchess 2.8 : 3433 43 219.0 340 64.4% 12 Minic 3.30 : 3323 32 659.0 1412 46.7% 13 Black Marlin 7 : 3288 32 681.0 1792 38.0% 14 Arasan 23.3 NNUE : 3288 38 129.5 340 38.1% 15 Fire 8.1 : 3286 32 321.5 612 52.5% 16 Pedone 3.1 : 3282 30 591.5 952 62.1% 17 Igel 3.05 : 3280 28 798.0 1496 53.3% 18 Komodo 14 : 3271 33 823.5 3420 24.1% 19 Ethereal 13 classic : 3264 35 249.0 408 61.0% 20 Xiphos 0.6 : 3199 34 216.5 408 53.1%
Update: Added Stockfish 16.1, Berserk 13, Obsidian 12, Caissa 1.18, Rubichess 20240112, Clover 6.1, Alexandria 6.1.0 and Rebel 16.3.
Click here to download the complete rating list:
The rating list is updated to 27/04/2024, 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).