Chess Engines Diary

The Fritz 20 engine tested the new version of the Halogen 14 engine. This time, the examiner came out on top, winning 19 games and losing only one. 80 games ended in a draw. CEDR 680.485 games download (01.07.2025) 💾 Tournament download with 100 games 💻Asus Zenbook, AMD Ryzen 9 6900HX, RAM 32,0 GB  🖬 GUI-Fritz 20 👍 @chessenginesdiary Country - Poland, City - Malbork  🕓 Time 3'+3"

Tactical Titan v2 won a major tournament of new chess engine versions. And it did so by a clear margin. Artemis 17.3TR sl came in second, and ShashChess 39 came in third. The tournament was held using Lucas Chess.   CEDR  680.485 games download  (01.07.2025) 💾  Tournament  download with 792 games 💻HP ENVY i5-8250U 8GB RAM  🖬 GUI-Lucas Chess 👍 @chessenginesdiary Country - Poland, City -  Malbork   🕓 Time 3'+3" P Engine CEDR Score (Tie) Chg +/-/= 1: Tactical Titan v2 3759 103.5 / 132 5625.25 -53 (+75 -0 =57) 2: Artemis 17.3TR sl 3758 98.5 / 132 5359.50 -92 (+65 -0 =67) 3: ShashChess 39 3758 98.5 / 132 5282.75 -92 (+65 -0 =67) 4: PlentyChess 6.0.2 3721 96.5 / 132 5141.75 -106 (+63 -2 =67) 5: Astra 6.1.1 2400 94.0 / 132 4771.00 +700 (+66 -10 =56) 6: Pawnocchio 1.8 2400 93.5 / 132 477...

Over 1,100 games played – a major tournament for amateur chess engines. Integral 7.0.0-dev JA won, with PlentyChess 6.0.5 JA in second place and Motor 0.9.0 in third.   GPU NVIDIA  RTX 3060 ti. GUI-Banksia, For Every Engine only 1 CPU and 512 Hashtables, Book - 4 GM mvs book,  6TBs. 🕒🕒Time 3'+3"    Tournament  download with 1104 games   💾 All games CEDR  680.485 games download  (01.07.2025)   @chessenginesdiary P Engine Score (Tie) +/-/= 1: Integral 7.0.0-dev JA 59.5 / 92 2638.25 (+40 -13 =39) 2: PlentyChess 6.0.5 JA 54.5 / 92 2437.75 (+23 -6 =63) 3: Motor 0.9.0 53.0 / 92 2369.50 (+22 -8 =62) 4: Obsidian dev-16.14 51.5 / 92 2305.50 (+19 -8 =65) 5: Caissa 1.22.1 51.0 / 92 2319.75 (+1...

Dear readers and friends of the Chess Engines Diary team, Great news! We've just updated our ** MEGA disk ** for all our amazing donors. This is our way of showing appreciation for your support, which directly helps us create new content. You'll find a list of the added files below. Look: New Bonus Rules from the Chess Diary MEGA Dysk - update 30.07 .2025   (31 files added) Engines for Windows: (14 files):  Artemis 17.3TR (and evL and our trained file - .learn), Bread Engine 1.5.5, CasanChess 0.9, Celeris 2.0, Clover 8.2.5, Halogen 14, Heimdall 1.4.0, Meltdown 1.10, Omega 8-M, Pawnocchio 1.8.1, Pluto 1.0.1, Potential 2 dev.3543 JA, Scorpio NN 3 dev.3af4 JA, Stockfish dev-20250728. MacOS (1 files):  Pawnocchio 1.8.1. Engines for Android (8 files):  Bitbit 1.4 JA, CorChess 250618, Frozenight 7.0.0 JA, Illumina 3.0 JA, Jinx 1.0 JA, Marvin 6.3.0 JA, Potential 2 dev.3543 JA, RubiChess 250606. ---- Book and NNUE (2 files):  LesChats26072025,  Yoruba18...

  Celeris - a fast chess engine Author: Evan Fung Celeris 2.0 - what's new? Move generation Magic Bitboards (wiki) PEXT intrinsics (Optional) (wiki) Fancy Magic Bitboards (wiki) Fully Legal and Fast Move Generator Keep tracks of pins and checks etc Fast move generation (Up to 600 Mnps on a R9 7900) Move ordering Killer Move Heuristics History Table (wiki) MVV-LVA (wiki) Staged Move Generation (wiki) Static Exchange Evaluation (wiki) Capture History (wiki) Continuation History (wiki) Search Iterative Deepening (wiki) Classic Alpha Beta Search (wiki) Negamax Quiescence Search (wiki) Transposition Table (wiki) - Lockless Hashing Null Move Pruning (wiki) Late Move Reductions (wiki) Principal Variation Search (wiki) Late Move Pruning Futility Pruning (wiki) Singular Extension Search (wiki) Internal Iterative Deepening/Reductions (wiki) SEE Pruning Mate Distance Pruning (wiki) Evaluation NNUE evaluation Celeris 2.0 - tests and strength/ELO About 3400-3450 Elo Celeris vs Stash (3430 ...

  Artemis 17.3TR sl won a major (over 1000 games) tournament of elite chess engines. ShashChess 39 took second place, and Stockfish 17.1 took third. The test was conducted using Lucas Chess. CEDR  680.485 games download  (01.07.2025) 💾  Tournament  download with 1092 (!) games 💻Asus Zenbook, AMD Ryzen 9 6900HX, RAM 32,0 GB  🖬 GUI-Lucas Chess 👍 @chessenginesdiary Country - Poland, City -  Malbork   🕓 Time 3'+3" P Engine CEDR Score (Tie) Chg +/-/= 1: Artemis 17.3TR sl 3758 87.0 / 156 6537.25 -31 (+18 -0 =138) 2: ShashChess 39 3758 86.5 / 156 6502.25 -47 (+17 -0 =139) 3: Stockfish 17.1 3752 85.5 / 156 6427.50 -31 (+15 -0 =141) 4: SF-PRO2 02.05.2025 3761 85.5 / 156 6424.25 -62 (+15 -0 =141) 5: Yuliana 7.0 3759 85.5 / 156 6401.75 -47 (+15 -0 =14...

Pluto - is a UCI-compatible chess engine written in Rust Author: Ludovic ( Lxdovic) T he current version uses the [Shakmaty Chess Library](https://github.com/niklasf/shakmaty) for move generation. It was initially designed as an analysis engine for the the Castled Chess Project. Pluto 1.0.1 what's new? This version does not come with any strength increase Changelog Added version to exe file when calling make and to uci id Pluto 1.0.1 download

  Casanchess -  UCI compatible chess engine written in C++. The NNUE evaluation is trained on millions of positions from auto-games and randomly generated FENs, evaluated with its own classical evaluation upto depth 7. Author: Carlos Sanchez Mayordomo CasanChess 0.9 what's new? This version significantly improves program consistency and stability, aiming to lay a solid foundation for the upcoming v1.0, more focused on playing strength. Features Add bench command to verify the number of search nodes in a set of fixed positions. Enhancements Reverse futility pruning: decrease margin from 125 to 100. Results in more aggressive pruning. Recapture extension: correct the entry conditions. Results in more extensions (especially for non-PV nodes). Bugfixes Fix: Crashes in special mate positions (fix #1). Fix: Hash table depth underflow (fix #2). Increase playing strength. Consistency & Stability Correct all warnings from the major compilers. Fix crashes in Debug executable due to...

Scorpio - NN chess engine, Rating Chess Engines Diary CEDR=2859 Author: Daniel Shawul Jim Ablett compiles: Scorpio NN 3 dev.3af4 JA download

Kookaburra 3.10 has won another major tournament for elite chess engines (over 1,500 games played). Yuliirma 5.0 secured second place, while Artemis 17.3 TR SL and Stockfish 20250702 Ivec shared third and fourth. For comparison, Stockfish 14.1 finished 10th. CEDR  680.485 games download  (01.07.2025) 💾  Tournament  download with 1530 (!) games 💻Dell G15 SE, i7-11800H RAM 16,0 GB  🖬 GUI-Banksia 👍 @chessenginesdiary Country - Poland, City -  Malbork   🕓 Time 3'+3" Tech table: Engine KN/mov NPS dep/mov time/mov mov/gam time/gam fails Arcanum 2.6 5257 1038780 18.1 5.1 66.2 335.2 Artemis 17.2TRsl 11518 2013225 44.4 5.7 65.6 375.6 Artemis 17.3 TR sl 12670 2347784 46.5 5.4 71.1 383.8 Clover 8.2.1 19362 3895124 45.0 5.0 81.6 405.7 CorChess 20250702 12414 2412382 39.8 5.1 72.0 370.6 Halogen 13.10.0 20259 4017716 28.8 5.0 79.0 398.6 1 JudaS ++ 1.02 13299 2493264 44.1 5.3 70.5 375.9 Kookaburra 3.10 11833 2322836 49.2 5.1 75.6 385.3 Obsidi...

Official prerelease  Stockfish dev-20250728 Rating Chess Engines Diary CEDR=3763 Great news for chess enthusiasts! The pre-release version of Stockfish dev-20250728 , widely recognized as the world's top chess engine, has been released. This brings us one step closer to the next official release. Our team is excited to begin testing it today, and we'll be sure to share the results on our website. Stay tuned! What changes in the new Stockfish dev-20250728 version? Simplify LMR extension limit formula This patch simplifies the maximum depth formula that reductions in LMR can allow. Passed STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 35616 W: 9358 L: 9139 D: 17119 Ptnml(0-2): 101, 4051, 9278, 4284, 94 https://tests.stockfishchess.org/tests/view/688608cf966ed85face24882 Passed LTC LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 22284 W: 5833 L: 5613 D: 10838 Ptnml(0-2): 8, 2367, 6173, 2585, 9 https://tests.stockfishchess.org/tests/view/68860d7f966ed85face248d5 closes https...

Meltdown - UCI chess engine Author:  Hans Binderup NOTE: this is a hobby project that is work in progress. C++26 chess engine. Meltdown 1.10 - what's new in this version? transposition: use multiply-shift hashing for index by @hansbinderup in #179 searcher: add extended futility pruning by @hansbinderup in #180 searcher: add late move pruning by @clarashepherd in #181 searcher: improve qsearch return values | compensate for correction in qsearch | fix duplicate merge issue by @hansbinderup in #182 movegen: add MoveNoisy type | searcher: use MoveNoisy in qsearch | move_picker: skip bad noisy moves by @hansbinderup in #183 see_swap: correct pawn attacks | improve attack gen by @hansbinderup in #188 see_swap: correct lva | correct promotion scores | correct en-pessant score by @hansbinderup in #189 spsa: apply tuning from spsa 12-07-25 by @hansbinderup in #190 terms: add king attack pawn terms by @hansbinderup in #193 move_handling: improve castle rights | mask_tables: move tables an...

Omega - new chess engine by Solista (Stockfish derivatives) Rating Chess Engines Diary CEDR=3750 Author:  This version uses the Stockfish update from July 24, 2025. Otherwise, the engine is identical to 7-M. Omega 6-M vs other engines: Clover 8.1.16 14/24 +4 24 Games RubiChess 20250520 11.5/22 +1 22 Games DarkSeid 6.0 11/22 +0 22 Games Stockfish 17.1 11/22 +0 22 Games SF PB 030625 11/22 +0 22 Games SF-PRO202.05.2025 10/20 +0 20 Games Koivisto 9.2 JA 12/16 +8 16 Games BlackFish 270525 8/16 +0 16 Games CalvinChess 6.1.1 JA 9/14 +4 14 Games Uralochka 3.42 dev9 JA 8.5/14 +3 14 Games Berserk 20250606 7.5/14 +1 14 Games DarkZoryn 7/14 +0 14 Games Motor 0.9.0 7/14 +0 14 Games Pawnocchio 1.7.0 9.5/12 +7 12 Games Caissa 1.22 6.5/12 +1 12 Games PlentyChess 6.0.0 6.5/12 +1 12 Games Stockfish dev-20250602 6/12 +0 12 Games Omega 6 6/12 +0 12 Games Cool Iris v19 6/12 +0 12 Games Killfish PB 200525 6/12 +0 12 Games Obsidian dev-16.05 6/12 +0 12 Games Omega 8-M download engine from page: htt...

Clover - UCI chess engine Author: L uca Metehau Rating Chess Engines Diary CEDR=3670 v.8.2.1: Bugfix release! FRC flag wasn't being read, so Clover actually didn't play FRC, silly me. v.8.2: Hello again, after a long time! New version is here, mostly search improvements and just making code cleaner. I'm quite unable to train any new net soon, hence I thought I could release now, before next release, which will have a new net for sure, but also because I'm bored of just search patches. On an unbalanced book, improvements are around 25-30 elo at LTC. Have fun with Clover and please report any bugs! Clover 8.1.16 vs other engines: Motor 0.9.0 11.5/22 +1 22 Games Berserk 20250606 11/22 +0 22 Games RubiChess 20250520 11/21 +1 21 Games Stockfish 17.1 9.5/19 +0 19 Games Starzix 6.1 JA 9/19 -1 19 Games Fritz 20 10/18 +2 18 Games Horsie 1.1.0 9.5/18 +1 18 Games Caissa 1.22 JA 9/18 +0 18 Games Alexandria 8.0.0 JA 9/18 +0 18 Games PlentyChess 6.0.0 JA 6.5/15 -2 15 Games Integral ...