Chess rating list – anchored on Rebel 6 UCI and Fritz BnB – Pentium 90

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:

ratinglist.txt

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).

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