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

TOP 20:

   # PLAYER                           : RATING  ERROR   POINTS  PLAYED    (%)
   1 Stockfish 15                     :   3692     47    531.0     680   78.1%
   2 Shashchess 18.2                  :   3648     44    911.0    1155   78.9%
   3 Crystal 3.2                      :   3582     45    421.0     612   68.8%
   4 Koivisto 8.0                     :   3472     48    401.0     680   59.0%
   5 Berserk 8.5.1                    :   3460     45    244.0     544   44.9%
   6 Slowchess 2.8                    :   3443     48    253.0     408   62.0%
   7 Rubichess 2021 NNUE              :   3387     60     83.0     204   40.7%
   8 Seer 2.5                         :   3361     54    116.0     272   42.6%
   9 Fire 8.1                         :   3292     42    343.0     680   50.4%
  10 Arasan 23.3 NNUE                 :   3291     52    138.0     408   33.8%
  11 Igel 3.05                        :   3283     39    816.0    1564   52.2%
  12 Pedone 3.1                       :   3276     40    608.0    1020   59.6%
  13 Komodo 12                        :   3263     37    754.5    1384   54.5%
  14 Ethereal 13 classic              :   3260     45    267.0     476   56.1%
  15 Xiphos 0.6                       :   3190     43    227.5     476   47.8%
  16 Rofchade 2.3                     :   3143     44    220.0     476   46.2%
  17 Booot 6.5                        :   3125     45    163.5     476   34.3%
  18 Laser 1.7                        :   3117     37    504.5     976   51.7%
  19 Lc0 0.29dev 791982               :   3112     48    140.0     408   34.3%
  20 Weiss 2.0                        :   3100     43    252.0     612   41.2%

Click here to download the complete rating list:

ratinglist.txt

The rating list is updated to 20/05/2022, it is calculated with Ordo and it is bases 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 has been 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 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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