Chess rating list – anchored on Rebel 6 UCI – Pentium 90

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).

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