Stefan Pohl Computer Chess

Latest Website-News (2025/09/13): I released the new V6.0 of my EAS-Tool, download here. This is a major update, introducing a new early-sacrifice-bonus and a complete overhaul of the scoring system. In the download, you find a WhatsNew textfile with further informations. The EAS-ratinglists on this website are done with V6.0 of the EAS-Tool from now.

 

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).

 

Next testrun: Clover 9.1

 

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: 2025/09/07: Stockfish 250902 (-1 Celo to Stockfish 250824)

 

(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

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

 

(best Stockfish Celo: Stockfish 250802: 3859 Celo, latest full release (Stockfish 17.1) had 3854 Celo)

(highest EAS-Score since Stockfish 16 release: Stockfish 240519: 203882 EAS-points)

(Read the explanation of the Lc0-entry in the Ratinglist here).

     Program                    Celo    +    - Games    Score   Av.Op. Draws

   1 Stockfish 250902 a512    : 3857    4    4 15000    67.0%   3729   48.5%
   2 Stockfish 17.1 250330    : 3854    4    4 15000    66.7%   3729   48.9%
   3 Torch 4 a512             : 3808    4    4 15000    60.3%   3732   49.3%
   4 Obsidian 250706 a512     : 3787    4    4 15000    57.3%   3734   50.0%
   5 Reckless 0.8.0 a512      : 3777    4    4 15000    55.9%   3735   49.6%
   6 PlentyChess 6.15 a512    : 3767    4    4 15000    54.5%   3735   49.9%
   7 Integral 250805 a512     : 3757    4    4 15000    52.9%   3736   50.2%
 [   Lc0 0.32dev BT4-6077500  : 3753   15   15  1000 (NN vs SF15.1 testing)]   
   8 Berserk 250606 a512      : 3740    4    4 15000    50.4%   3737   50.6%
   9 Alexandria 8.1 a512      : 3725    4    4 15000    48.3%   3738   50.5%
  10 Viridithas 18.0 a512     : 3692    4    4 15000    43.4%   3740   49.4%
  11 Caissa 1.23 a512         : 3691    4    4 15000    43.3%   3740   50.5%
  12 KomodoDragon 3.3 avx2    : 3689    4    4 15000    42.9%   3740   50.2%
  13 Clover 9.0 a512          : 3683    4    4 15000    42.2%   3741   51.5%
  14 Stormphrax 7.0 avx2      : 3669    4    4 15000    40.1%   3742   48.6%
  15 Horsie 1.1 a512          : 3651    4    4 15000    37.5%   3743   48.9%
  16 RubiChess 250606 a512    : 3649    4    4 15000    37.3%   3743   49.5%

 

Games        : 120000 (finished)
White Wins   : 59264 (49.4%)
Black Wins   : 1023   (0.9%)
Draws        : 59713 (49.8%)

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 250902 a512    :    3862     11    7500  5247  2008   245  83.3      92
   2 Stockfish 17.1 250330    :    3854   ----    7500  5147  2115   238  82.7     100
   3 Torch 4 a512             :    3723     10    7500  3841  2821   838  70.0     100
   4 Obsidian 250706 a512     :    3674     10    7500  3318  3012  1170  64.3     100
   5 Reckless 0.8.0 a512      :    3650      9    7500  3039  3135  1326  61.4     100
   6 PlentyChess 6.15 a512    :    3627     10    7500  2777  3239  1484  58.6     100
   7 Integral 250805 a512     :    3605     10    7500  2582  3205  1713  55.8     100
   8 Berserk 250606 a512      :    3564     10    7500  2132  3315  2053  50.5     100
   9 Alexandria 8.1 a512      :    3532      9    7500  1835  3291  2374  46.4     100
  10 Viridithas 18.0 a512     :    3460     10    7500  1242  3107  3151  37.3      78
  11 Caissa 1.23 a512         :    3457     10    7500  1203  3123  3174  36.9      67
  12 KomodoDragon 3.3 avx2    :    3455      9    7500  1200  3095  3205  36.6     100
  13 Clover 9.0 a512          :    3436     10    7500  1067  3014  3419  34.3     100
  14 Stormphrax 7.0 avx2      :    3404     10    7500   815  2953  3732  30.6     100
  15 RubiChess 250606 a512    :    3362     10    7500   629  2608  4263  25.8      76
  16 Horsie 1.1 a512          :    3358     10    7500   603  2605  4292  25.4     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 23323 (= 38.87%) 
--- Number of 1:1 drawn Gamepairs    : 11461 (= 19.10%) 
--- Number of 2-draws drawn Gamepairs: 11862 (= 19.77%) 
------------------------------------------------------------------- 

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"...