Chess Engines Diary

UCI chess engine -  Aurora . Author: Kjljixx Rating Chess Engines Diary CEDR=2690 Aurora is an actively developed UCI (Universal Chess Interface) compatible chess engine. This means that Aurora is a command-line-based engine and you will need a UCI-Compatible GUI in order to intuitively use Aurora. See the "Usage" section below for usage instructions. What's new? This release includes significant qsearch and nn improvements, increasing Aurora's strength by up to 170 elo compared to v1.27.0 Progression tests: STC: Elo   | 129.55 +- 21.13 (95%) Conf  | 8.0+0.08s Threads=1 Hash=16MB Games | N: 906 W: 553 L: 230 D: 123 Penta | [22, 22, 172, 85, 152] https://ob.kjljixx.com/test/194/ LTC: Elo   | 172.78 +- 29.39 (95%) Conf  | 30.0+0.30s Threads=1 Hash=32MB Games | N: 500 W: 322 L: 92 D: 86 Penta | [8, 7, 74, 69, 92] https://ob.kjljixx.com/test/195/ Aurora 1.16.2 vs other engines: Obsidian 13.0 0/6 -6 6 Games Lambergar 0.6.0 0/6 -6 6 Games Nalwald 19 0/6 -6 6...

Revolution - Revolution is a free, open-source UCI chess engine derived from Stockfish. Jorge Ruiz Centelles , with credit to ChatGPT, modifies and extends the code to explore new concepts. The engine implements cutting-edge search algorithms combined with neural network evaluation. Derived from fundamental chess programming principles, Revolution analyzes positions through parallelized alpha-beta search enhanced with null-move pruning and late move reductions. As a UCI-compliant engine, Revolution operates through standard chess interfaces without an integrated graphical interface. Users must employ compatible chess GUIs (Arena, Scid vs PC, etc.) for board visualization and move input. Consult your GUI documentation for implementation details. Rating Chess Engines Diary CEDR=3853.8 Revolution 6.10-310726 vs other engines: HORIZON + 14.5/28 +1 28 games Stockfish 18 14.5/28 +1 28 games CorChess 20260818 10.5/20 +1 20 games SF-POLY 230826 10/20 +0 20 games Stockfish dev-2026081...

Heimdall -  UCI chess engine written in Nim. Author: Mattia Giambirtone  Rating CEDR=3644 More info Heimdall is available on Lichess under its old name (Nimfish), feel free to challenge it! I try to keep the engine running on there always up to date with the changes on the master branch Github: https://github.com/nocturn9x/heimdall Heimdall - what's new? A lot of nitty-gritty performance stuff found by GPT 6 Astra (thanks OpenAI!), a shiny new threat inputs network (many many thanks to @swedishchef for helping me with that!) and a lot of other minor things. Can't really be arsed to write a changelog, nobody reads those anyway. Just read the commits if you're interested! One important note is that heimdall now releases with universal binaries! I won't claim to have the brains to understand most of the logic that goes into that (I shamelessly vibecoded that part, deal with it), but it should simplify testing quite a bit. See here for details! Strength UHO_Lichess_4852_v1...

ChessTango exemplifies the practical application of object-oriented design patterns within a board game context: a chess engine. Author: Mauricio Coria ChessTango 1.10.0 download     mirror Onslaught is a Universal Chess Interface (UCI) compliant chess engine developed in C++. Designed for performance, Onslaught can be used with various UCI-compatible chess graphical user interfaces (GUIs) to play, analyze, and find optimal moves in standard chess positions. Author: Kai ( kachhy)  Rating CEDR=3141 Onslaught 2.0 download Thom , UCI-compliant NNUE chess engine created in C. Named after Thom Merrilin from The Wheel of Time. All NNUE data was self-generated, starting from HCE-generated data. The NNUE requires compliance with AVX2 SIMD instructions. Thom 1.0.3 download ABC (Array Based Chess) is a small, didactic chess engine written in C — but this repository is a book repository first, and an engine repository second. The main purpose of this project is to document h...

  Ember - Ember is a UCI-compatible chess engine written in Rust that I'm writing for learning and experimentation. The project is in active development and is regularly updated and improved. Author: D.r.e.A.m.e.R  Rating Chess Engines Diary CEDR=3242 Ember is a new, promising chess engine. Its previous version participated in the pre-qualification tournament for the chess engine league and scored 50%. New versions are released frequently – we'll see how this engine progresses. Ember what's new? Optimize NNUE inference: AVX2 dot-product fusion, L1 matmul fast-path and BMI2 PEXT sliding attacks by @ExxDreamerCode in 6f70e67 and 8c4f239 Preparing the external path to becoming the primary one by @ExxDreamerCode in c0149ef Hardened Ember V2 container conversion, Colab training and NNUE installation by @starius in 60ccb5a, 5399677 and 0452ad3 Route Ember V2 through NNUE backends, load compact containers through the standard path and cover fused AVX2 inference by @starius in cf...

  DON   - UCI chess engine Author: Ehsan Rashid   Rating Chess Engines Diary CEDR=3840 DON is a free UCI chess engine. It is not a complete chess program and requires some UCI-compatible GUI (e.g. XBoard with Polyglot, eboard, Arena, Sigma Chess, Shredder, Chess Partner or Fritz) in order to be used comfortably.  DON what's new? Precompiled binaries of the latest DON development version, built automatically on every commit. DON dev-20260116 vs other engines: Revolution 4.50 160126 5.5/10 +1 10 games CorChess 20260108 5/10 +0 10 games Stockfish dev-20260115 5/10 +0 10 games Esox III 5/10 +0 10 games HypnoS 241225 5/10 +0 10 games JigSaw 7.00 SuPreme 5/10 +0 10 games Kookaburra 3.11 5/10 +0 10 games Artemis 26.1TR PrO 5/10 +0 10 games Raid 5.3 5/10 +0 10 games ShashChess 40 5/10 +0 10 games Stockfish 17.1 5/10 +0 10 games Tactical Titan 6.0 PrO 4.5/10 -1 10 games DarkSeid 7.7 EE 4.5/10 -1 10 games StockfishMZ 121225 4.5/10 -1 10 games Brainlearn 31 4/9 -1 9 g...

Official prerelease  Stockfish dev-20260922 Rating Chess Engines Diary CEDR= 3849 Great news for chess enthusiasts!  The pre-release version of Stockfish dev-20260922 , widely recognized as the world's top chess engine, has been released. We’re now one step closer to the next official release. Our team is excited to kick off testing today, and we’ll post the results on our website.  Stay tuned! Stockfish dev-20260922 download     mirror    Here are some sample tournament wins for the Stockfish engine on Android and Windows:: Stockfish dev-20250513 wins Android Chess Engines Tournament, 18.05.2025 Stockfish 250425 wins Strong Engines Tournament (Tests by Jörn Gronemann, 2025.05.04) Stockfish dev-20250519 wins Chess Engines Tournament for MacOS, Chess Engines Diary, 2025.06.16 , Stockfish dev-20250602 wins New Chess Engines Test, 11-13.06.2025 , Stockfish dev-20250602 wins New Engines Test, 16-17.06.2025 ,

Caissa - UCI chess engine,  Author: Michał Witanowski Rating Chess Engines Diary CEDR=3792 Caissa - what's new? Caissa 2.0 This release switches the evaluation to a multilayer neural network and brings a new AVX-512 Ice Lake build, much better play at ultra-short time controls, and minor fixes. Playing Strength LTC, 60+0.6, UHO book: ELO    40.41 +- 4.85 (95%) CONF   60.0+0.60s Threads=1 Hash=128MB GAMES  N: 5000 W: 1480 L: 901 D: 2619 PENTA  [5, 357, 1211, 908, 19] https://furybench.com/test/7443/ STC, 10+0.1, UHO book: ELO    29.15 +- 4.59 (95%) CONF   10.0+0.10s Threads=1 Hash=16MB GAMES  N: 6284 W: 1814 L: 1288 D: 3182 PENTA  [25, 550, 1478, 1052, 37] https://furybench.com/test/7442/ STC, 10+0.1, DFRC UHO book: ELO    28.69 +- 10.70 (95%) CONF   10.0+0.10s Threads=1 Hash=16MB GAMES  N: 1396 W: 398 L: 283 D: 715 PENTA  [13, 126, 314, 223, 22] https://furybench.com/test/7445/ Changes E...

  This was another major test tournament for us, featuring 1,520 games. Private19sf 2.90_VICE took first place, followed by the Stockfish 19 engine and DON dev-20260914 . Impressively, Stockfish 17.1 achieved a high ranking without suffering a single loss. CEDR 903.628 games download (until 30.06.2026) All Games 85.078 CEDR from 01.09.2026 download . 💾 Tournament games :  1520 download 💻 Asus Zenbook, AMD Ryzen 9 6900HX, RAM 32,0 GB   🖬 GUI - Myracle, book:avt-2026b #chessenginesdiary Country - Poland, City - Malbork   🕓 Time 3'+3"