Stefan Pohl Computer ChessHome of famous UHO openings and EAS RatinglistLatest Website-News (2026/10/25): The new Stockfish VLTC testing has started. The first 2 dev versions of Stockfish have been tested. Additionally, I tested several older Stockfish releases vs. Stockfish 19, too (Stockfish 18, 17.1, 17 (Stockfish 16.1 will follow)).
Next testrun: Triumviratus 261029, because I will do a new test-format, called "Try to beat Stockfish". Here, some superstrong engines (AI or not AI) are playing 3000 VLTC games vs. Stockfish 19 (like in my new VLTC Stockfish testing). These tests are not a ratinglist testrun, and are done and stored separately on a new subsite.
Stay tuned. VLTC Stockfish testing (vs. latest Stockfish release)
Playing conditions:
The latest official Stockfish (Stockfish 19 right now), plays 3000 games versus the latest Stockfish dev with VLTC (30min+5sec, singlethread)
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 19: 500 kn/s (when 31 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 huge UHO_XXL_2022 openings (formerly used in Fishtest)(UHO 2022 openings are part of my Anti Draw Openings download-package). Each gamepair played with a randomly chosen opening. Ponder, Large Memory Pages & learning: Off Thinking time: 30min+5sec per game/engine. One testrun (3000 games) takes 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). 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).
Latest update: 2026/10/31: Stockfish 261025
(Ordo-calculation fixed to Stockfish 19 = 3905 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)
Download the gamebase of the Stockfish VLTC testing here Download the old UHO-Top15 gamebase, the full-list gamebase and the archive here
(best Stockfish Celo: Stockfish 261025: 3914 Celo, latest full release (Stockfish 19) has 3905 Celo) Program Celo + - Games Score Av.Op. Draws 1 Stockfish 261025 : 3914 8 8 3000 51.3% 3905 64.4%
Games : 15000 (finished) Below the ratings, recalculated with Gamepairs (using my Gamepair Rescoring Tool V1.5), Ordo-calculation fixed to Stockfish 19 = 3905 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-D-L (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. # PLAYER : Celo Error Pairs W D L (%) CFS(%)
------------------------------------------------------------------- Below you find a diagram of the progress of Stockfish in my tests since February 2026. 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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