Stefan Pohl Computer Chess

Latest Website-News (2025/12/08): Testrun of Caissa 1.24 finished: +8 Celo to Caissa 1.23.

 

Ceres Binary here, Ceres Installation Guide here, Ceres Nets here

 

Dont forget to take a look at my EAS-Ratinglist (The world's first engine-ratinglist not measuring strength of engines, but engines's style of play).

 

Stay tuned.

UHO-Top15 Engines Ratinglist (+ regular testing of Stockfish Dev-versions)

 

 

Playing conditions:

 

The 15 strongest engines and the latest StockfishDev version are playing 1000 games vs. each opponent: 15000 games per engine are played. A RoundRobin Tournament with 120000 games overall !

 

Hardware: AMD Ryzen 9 7945HX 16-core (32 threads) notebook with 64GB RAM (since 2024/10/08), 2 identical machines. Windows 11 64bit

Speed: (singlethread, TurboBoost-mode switched off, chess starting position) Stockfish 17: 600 kn/s (when 26 games are running simultaneously)

Hash: 512MB per engine

GUI: Cutechess-cli (GUI ends game, when a 5-piece endgame is on the board, all other games are played until mate or draw by chess-rules (3fold, 50-moves, stalemate))

Tablebases: None for engines, 5 Syzygy for cutechess-cli

Openings: My UHO_2022_6mvs_+120_+129 openings are used (first 500 lines) (UHO 2022 openings are part of my Anti Draw Openings download-package). 

Ponder, Large Memory Pages & learning: Off

Thinking time: 3min+1sec per game/engine. One testrun (15000 games) takes around 80-85 hours (=3.5 days)

The version-numbers of the Stockfish engines are the date of the latest patch, which was included in the Stockfish sourcecode, not the release-date of the engine-file, written backwards (year,month,day))(example: 200807 = August, 7, 2020). The used SF compile is the AVX512-compile, which is the fastest on my AMD Ryzen CPU. SF binaries are taken from https://github.com/official-stockfish/Stockfish/releases (except the official SF-release versions, which are taken form the official Stockfish website).

Read the explanation, why I chose my testing-conditions, like I did here

 

Latest update: 2025/12/08: Caissa 1.24 (+8 Celo to Caissa 1.23)

 

(Ordo-calculation fixed to Stockfish 17.1 = 3854 Celo. Mention, there are no human or "realistic" Elo numbers in enginechess, since the engines reached superhuman strength, so I decided to use "Celo" (=Computer Elo) instead)

 

See the tournament cross-table as a picture (done by Fritz20 GUI) here

See the individual statistics of engine-results here

See the Engines Aggressiveness Score Ratinglist here

See the Gamepair-statistics of the UHO-Top15 Ratinglist here

See the full UHO Ratinglist (with EAS-Ratinglist): here

Download the current gamebase, the full-list gamebase and the archive here

Download all interesting wins (filtered by EAS-Tool) from the full UHO Ratinglist here

See the old SPCC-Ratinglist (full list) and EAS-List from 2020 until 2023/08/28: here

 

(best Stockfish Celo: Stockfish 251130: 3872 Celo, latest full release (Stockfish 17.1) had 3854 Celo)

     Program                     Celo    +    - Games    Score   Av.Op. Draws

   1 Stockfish 251130 a512     : 3872    4    4 15000    68.4%   3732   49.1%
   2 Stockfish 17.1 250330     : 3854    4    4 15000    66.1%   3734   49.0%
   3 Torch 4 a512              : 3806    4    4 15000    59.4%   3737   49.5%
   4 PlentyChess 7.0.22 TI     : 3793    4    4 15000    57.7%   3738   48.5%
   5 Reckless 251121 a512      : 3791    4    4 15000    57.3%   3738   49.5%
   6 Obsidian 250706 a512      : 3785    4    4 15000    56.4%   3738   50.2%
   7 Integral 250805 a512      : 3754    4    4 15000    51.9%   3740   50.3%
   8 Berserk 250606 a512       : 3736    4    4 15000    49.2%   3741   50.4%
   9 Alexandria 8.1.12 a512    : 3733    4    4 15000    48.9%   3742   50.4%
  10 Caissa 1.24 a512          : 3697    4    4 15000    43.6%   3744   50.7%
  11 Clover 9.1 a512           : 3692    4    4 15000    42.9%   3744   50.5%
  12 KomodoDragon 3.3 avx2     : 3688    4    4 15000    42.3%   3745   50.1%
  13 Viridithas 18.0 a512      : 3687    4    4 15000    42.1%   3745   49.2%
  14 Stormphrax 7.0 avx2       : 3668    4    4 15000    39.5%   3746   48.2%
  15 Horsie 1.1 a512           : 3651    4    4 15000    37.1%   3747   49.0%
  16 RubiChess 250606 a512     : 3650    4    4 15000    36.9%   3747   49.3%

 

Games        : 120000 (finished)
White Wins   : 59346 (49.5 %)
Black Wins   : 1101 (0.9 %)
Draws        : 59553 (49.6 %)

Below the UHO-Top15 Ratinglist, recalculated with Gamepairs (using my Gamepair Rescoring Tool V1.5), Ordo-calculation fixed to Stockfish 17.1 = 3854 Celo, realizing Vondele's (Stockfish Maintainer) idea: "Thinking uniquely in game pairs makes sense with the biased openings used these days. While pentanomial makes  sense it is a bit complicated so we could simplify and score game pairs only (not games) as W-L-D (a traditional score of 2-0, or 1.5-0.5 is just a W)."

Mention, the errorbar here is +/-5.5 Celo (=11 overall Error), compared to +/-4 Celo in the classical ratinglist above (=1.375 wider errorbar here). But the result-gaps are (at least) 2x up to 2.5x bigger (in average), calculating with gamepairs. So, the statistical reliability of the results is much better in the Gamepair-ratinglist, compared to the classical ratinglist...

CFS means Chance For Superiority in percent, calculated by ORDO.

See the head-to-head gamepair-statistics of the UHO-Top15 Ratinglist here

   # PLAYER                    :    Celo  Error   Pairs     W     D     L   (%)  CFS(%)
   1 Stockfish 251130 a512     :    3910     11    7500  5564  1776   160  86.0     100
   2 Stockfish 17.1 250330     :    3854   ----    7500  5049  2143   308  81.6     100
   3 Torch 4 a512              :    3719     10    7500  3690  2858   952  68.3     100
   4 PlentyChess 7.0.22 TI     :    3687     10    7500  3361  2960  1179  64.5      79
   5 Reckless 251121 a512      :    3683     10    7500  3299  3019  1182  64.1     100
   6 Obsidian 250706 a512      :    3670     10    7500  3163  3066  1271  62.6     100
   7 Integral 250805 a512      :    3598     10    7500  2447  3168  1885  53.7     100
   8 Berserk 250606 a512       :    3555     10    7500  1982  3275  2243  48.3      80
   9 Alexandria 8.1.12 a512    :    3551     10    7500  1972  3228  2300  47.8     100
  10 Caissa 1.24 a512          :    3470      9    7500  1251  3124  3125  37.5     100
  11 Clover 9.1 a512           :    3458     10    7500  1163  3090  3247  36.1      86
  12 KomodoDragon 3.3 avx2     :    3454     10    7500  1157  3018  3325  35.5      93
  13 Viridithas 18.0 a512      :    3448     10    7500  1107  3009  3384  34.8     100
  14 Stormphrax 7.0 avx2       :    3401     10    7500   777  2852  3871  29.4     100
  15 RubiChess 250606 a512     :    3362      9    7500   592  2576  4332  25.1      83
  16 Horsie 1.1 a512           :    3357     11    7500   575  2540  4385  24.6     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 22851 (= 38.08%) 
--- Number of 1:1 drawn Gamepairs    : 11260 (= 18.77%) 
--- Number of 2-draws drawn Gamepairs: 11591 (= 19.32%) 
------------------------------------------------------------------- 

Aborted testruns, because the tested engine was too weak to enter the UHO-Top15 Ratinglist:

Heimdall 1.4.1, Renegade 1.2.0, Igel 3.6.0, Minic 3.41, Booot 7.3, Black Marlin 9.0, Equisetum 1.0, Quanticade 2.0, Clarity 8

Below you find a diagram of the progress of Stockfish in my tests since February 2023. 

And below that diagram, the older diagrams.

 

You can save the diagrams on your PC with mouseclick (right button) and then choose "save image"...