Stefan Pohl Computer Chess

Home of famous UHO openings and EAS Ratinglist


Latest Website-News (2025/09/02): Testrun of Reckless 0.8.0 finished: +50 Celo to Reckless 250630 and +121 Celo to Reckless 250521. Incredible progress in only (around) 15 weeks... Reckless is now on rank#4, just behind Stockfish, Torch and Obsidian.

EAS-score also improved, from 65k (Reckless 250630) to 85k (but the EAS-score is still nothing special).

 

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: Halogen 15.0. Let's see, if Halogen is strong enough for the UHO-Top15 Ratinglist...

 

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

OpeningsMy 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: 2025/09/02: Reckless 0.8.0 (+50 Celo to Reckless 250630)

 

(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 250824 a512    : 3858    4    4 15000    67.0%   3730   48.6%
   2 Stockfish 17.1 250330    : 3854    4    4 15000    66.5%   3731   48.7%
   3 Torch 4 a512             : 3809    4    4 15000    60.3%   3734   49.6%
   4 Obsidian 250706 a512     : 3788    4    4 15000    57.3%   3735   50.0%
   5 Reckless 0.8.0 a512      : 3779    4    4 15000    55.9%   3736   49.5%
   6 PlentyChess 6.15 a512    : 3768    4    4 15000    54.5%   3736   50.0%
   7 Integral 250805 a512     : 3757    4    4 15000    52.8%   3737   50.2%
 [   Lc0 0.32dev BT4-6077500  : 3753   15   15  1000 (NN vs SF15.1 testing)]
   8 Berserk 250606 a512      : 3741    4    4 15000    50.5%   3738   50.5%
   9 Alexandria 8.1 a512      : 3726    4    4 15000    48.2%   3739   50.6%
  10 Viridithas 18.0 a512     : 3693    4    4 15000    43.4%   3741   49.6%
  11 Caissa 1.23 a512         : 3693    4    4 15000    43.4%   3741   50.5%
  12 KomodoDragon 3.3 avx2    : 3690    4    4 15000    43.0%   3742   50.3%
  13 Clover 9.0 a512          : 3685    4    4 15000    42.3%   3742   51.5%
  14 Stormphrax 7.0 avx2      : 3670    4    4 15000    40.2%   3743   48.5%
  15 Horsie 1.1 a512          : 3652    4    4 15000    37.5%   3744   48.9%
  16 RubiChess 250606 a512    : 3650    4    4 15000    37.2%   3744   49.4%

 

Games        : 120000 (finished)
White Wins   : 59264 (49.4%)
Black Wins   : 1011   (0.8%)
Draws        : 59725 (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 250824 a512    :    3866     11    7500  5235  2046   219  83.4      99
   2 Stockfish 17.1 250330    :    3854   ----    7500  5132  2100   268  82.4     100
   3 Torch 4 a512             :    3727     10    7500  3835  2828   837  70.0     100
   4 Obsidian 250706 a512     :    3678     10    7500  3311  3028  1161  64.3     100
   5 Reckless 0.8.0 a512      :    3655     10    7500  3040  3157  1303  61.6     100
   6 PlentyChess 6.15 a512    :    3631     10    7500  2785  3222  1493  58.6     100
   7 Integral 250805 a512     :    3606     10    7500  2568  3183  1749  55.5     100
   8 Berserk 250606 a512      :    3569     10    7500  2128  3345  2027  50.7     100
   9 Alexandria 8.1 a512      :    3535     10    7500  1841  3264  2395  46.3     100
  10 Viridithas 18.0 a512     :    3464     10    7500  1241  3112  3147  37.3      76
  11 Caissa 1.23 a512         :    3461     10    7500  1203  3132  3165  36.9      67
  12 KomodoDragon 3.3 avx2    :    3459     10    7500  1204  3097  3199  36.7     100
  13 Clover 9.0 a512          :    3442     10    7500  1068  3040  3392  34.5     100
  14 Stormphrax 7.0 avx2      :    3409     10    7500   812  2974  3714  30.7     100
  15 RubiChess 250606 a512    :    3365     10    7500   630  2589  4281  25.7      66
  16 Horsie 1.1 a512          :    3363     11    7500   606  2605  4289  25.4     ---

 

------------------------------------------------------------------- 
--- Number of all Gamepairs          : 60000 
--- Number of drawn Gamepairs overall: 23361 (= 38.93%) 
--- Number of 1:1 drawn Gamepairs    : 11483 (= 19.14%) 
--- Number of 2-draws drawn Gamepairs: 11878 (= 19.80%) 
------------------------------------------------------------------- 


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

Halogen 14, 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"...







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