TOP TEN: Baseyelo
Rank Name Elo + - games score oppo. draws 1 Stockfish 15 dev-21092606 3789 22 22 884 83% 3326 32% 2 Shashchess 18.2 3760 21 21 950 81% 3335 35% 3 Slowchess 2.7 3498 24 24 476 58% 3430 46% 4 Rubichess 2.2 3478 22 22 612 62% 3370 37% 5 Koivisto 6 3470 13 13 1860 62% 3344 32% 6 Fire 8.1 3451 21 21 544 49% 3461 47% 7 Igel 3.05 3432 14 14 1428 53% 3415 39% 8 Pedone 3.1 3426 16 16 1020 60% 3351 44% 9 Komodo 12 3411 16 16 1316 57% 3319 27% 10 Ethereal 13 classic 3404 23 23 476 56% 3355 45%
TOP TEN: Ordo
# PLAYER : RATING ERROR POINTS PLAYED (%) 1 Stockfish 15 dev-21092606 : 3962 64 732.5 884 82.9% 2 Shashchess 18.2 : 3930 63 771.5 950 81.2% 3 Slowchess 2.7 : 3622 63 277.0 476 58.2% 4 Rubichess 2.2 : 3594 62 381.5 612 62.3% 5 Koivisto 6 : 3586 58 1144.5 1860 61.5% 6 Fire 8.1 : 3566 63 266.0 544 48.9% 7 Igel 3.05 : 3540 60 754.5 1428 52.8% 8 Pedone 3.1 : 3534 61 608.0 1020 59.6% 9 Komodo 12 : 3519 58 747.0 1316 56.8% 10 Ethereal 13 classic : 3514 62 267.0 476 56.1%
Click here to download the full rating list:
ratinglistbayes.txt (rating list calculated by Bayeselo with parameter “mm 1 1”)
ratinglistordo.txt (rating list calculated by Ordo)
The rating list is updated at 17/10/2021, it is calculated with Bayeselo and Ordo and consists of 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…).
- 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 only 34 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”, and some of the strongest 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).