Chess Engines Diary

Fructosita is an open-source UCI chess engine written entirely in Rust. The project began on July 2, 2026 as a personal initiative to learn chess engine development from scratch. The name Fructosita was inspired by the author's undergraduate thesis on fructose, eventually becoming the engine's permanent identity. The long-term goal is to evolve Fructosita from a classical handcrafted engine into a modern competitive chess engine featuring advanced search techniques and, eventually, an NNUE evaluation. Author: Josantesbo Fructosita 1.1.0 download ZeroG is a high-performance chess engine written in C99, featuring a hybrid board representation, magic bitboards, Zobrist hashing, transposition tables, and a Universal Chess Interface (UCI) protocol engine loop. Author: Kristian Ekman ZeroG 1.0.0 download Onyx a UCI chess engine written from scratch in C++, with a self-trained NNUE evaluation. Estimated strength: ~3200. Onyx was built and trained on a single desktop PC (Intel i7-117...

We've just launched a new MEGA drive for our sponsors! We are incredibly grateful for your crucial support. Your contributions are essential for the development of 'Chess Engines Diary' and enable us to keep delivering new content to you. Look: New Bonus Rules from the Chess Diary MEGA Dysk - update 09.06 .2025   (29 files added) Engines for Windows: (17 files):  Beast 3.2.2, Berserk 20250606 JA, CalvinChess 6.1.1, CalvinChess 6.1.1 JA, Meltdown 1.7, Obsidian 16.04, Obsidian 16.05, Obsidian 16.07, OliThink 5.11.4, peaBrain9 Windows, PlentyChess 6.0.0, Random Blitz, RubiChess 20250520, RukChess 4.1.0, Seagull 1.0 JA, SF PB 17.1 030625, SF PB 17.1 250525. MacOS (3 files):  Beast 3.2.2, OliThink 5.11.4, PlentyChess 6.0.0. --- Engines for Android (9 files):  Berserk 20250606 JA, Eleanor 1.0 JA, Koivisto 9.2 JA, Shadowfax 1.0.1 JA, Starzix 6.1 JA, Stockfish 250525, Tarnished 2.1 JA, Turbulence 0.0.7 JA, Uralochka 3.42 dev-9 JA. ---- Book and NNUE (0 files):...

We've just launched a new MEGA drive for our sponsors! We are incredibly grateful for your crucial support. Your contributions are essential for the development of 'Chess Engines Diary' and enable us to keep delivering new content to you. Look: New Bonus Rules from the Chess Diary MEGA Dysk - update 06.05 .2025   (24 files added) Engines for Windows: (14 files):  Artemis 14TR, Astra 5.2, Bread Engine 1.4.0, Cool Iris 18, KnightX 4.4, Kobra 2.0, Leorik 3.1.3 Dev JA, Morlock 0.91.2, Obsidian 15.17, Obsidian 15.20, Omega B4, Quirky 1.0, Reksio_PL, Renegade 1.2.0. MacOS (0 files): --- --- Engines for Android (8 files):  Kobra 2.0, PZChessBot  dev-20250421T23 JA, Seawall 20250322 JA, Shallow Guess 0.1.0 JA, Stash 37 JA, Stockfish 17.1, Superultra 2.1 JA, Timecat 1.45.0 JA. ---- Book and NNUE (0 files):--- --- Games (2 file):  CEDR.Mac.Games.95.05.2025.7z Games.2025.7z. --- GUI (0 files): --- --- How to become a sponsor: -  here

Group E-03 of the CEDR Amateur Chess Engine League was won by the Schoenemann 0.4.0 engine. Places 2-4 were taken by the Puffin 5.0, Orion 1.0 and Thrawn 2.1 JA engines. These four engines advanced to group E-02. Further tests are ongoing, results coming soon. All CEDR  625.428 games download  (01.04.2025)  💾  96 games from the tournament download 👍 @chessenginesdiary Country - Poland, City -  Malbork   🕓 Time 3'+3"  💻Asus Zenbook, AMD Ryzen 9 6900HX, RAM 32,0 GB 🖬 GUI-Aquarium Pl Engines 1 2 3 4 5 6 7 8 Score 1 Schoenemann 0.4.0 + 17 w + 2 w + 10 b = 3 b + 9 w = 4 b + 11 w + 8 b 7.0 2 Puffin 5.0 + 22 w - 1 b + 13 w = 4 w + 10 b = 3 b + 5 w + 7 w 6.0 3 Orion 1.0 + 23 b + 16 w + 12 b = 1 w + 20 b = 2 w + 6 b - 4 w 6.0 4 Thrawn 2.1 JA + 19 w + 15 w = 20 b = 2 b = 7 w = 1 w + 9 b + 3 b 6.0 5 Cheers 1.0.0 + 13 w - 10 b + 18 w - 6 b + 12 b + 9 w - 2 b + ...

The Amateur Chess Engine League - Group E-07 competition has concluded. Perseus 1.0 took first place, followed by Priessnitz 2.0 in second, Bobcat 8.0 JA in third, and EveAnn 3.0 in fourth. These four engines have advanced to Group E-06. Chess Engines Diary Team All CEDR  599.651 games download  (01.03.2025)  💾  70 games from the tournament download 👍 @chessenginesdiary Country - Poland, City -  Malbork   🕓 Time 3'+3"  💻Asus Zenbook, AMD Ryzen 9 6900HX, RAM 32,0 GB 🖬 GUI-Aquarium Pl Engine 1 2 3 4 5 6 7 Score WP Pr 1 Perseus 1.0 + 10 b = 2 w + 9 b + 11 w + 5 b + 3 w = 4 b 6.0 23.0 24.5 2 Priessnitz 2.0 + 16 w = 1 b + 10 w + 7 b + 3 w = 6 b = 9 w 5.5 22.5 23.5 3 Bobcat 8.0 JA + 17 b + 9 w + 7 b + 5 w - 2 b - 1 b + 6 w 5.0 23.5 23.0 4 EveAnn 3.0 + 11 b - 7 w + 8 b = 6 w + 14 w + 5 b = 1 w 5.0 22.0 19.5 5 Colossus 2025a + 13 b + 8 w + 6 w - 3 b - 1 w - 4...

As promised, from time to time we will test amateur chess engines. This tournament was won by Bagatur 5.1c and achieved an excellent result winning all games. Second place was taken by the "interesting" CT800 1.46 engine. In 3rd place was the Euwe 1.3.0 engine. The Aramis 1.4.0 engine generates only errors. We checked it on another GUI - it is the same, it seems that it is a bad compilation.   All CEDR games  429.636 download     💾  216 games from the tournament download @chessenginesdiary Country - Poland, City -  Malbork   🕓 Time 3'+3"  💻Asus Zenbook, AMD Ryzen 9 6900HX, RAM 32,0 GB 🖬 GUI-Arena Pl Engine CEDR Score S-B 1 Bagatur 5.1c 3118 48.0/48  1008,00  2 CT800 1.46 2824 42.0/48  756,00  3 Euwe 1.3.0 2400 33.0/48  472,50  4 Kobol 1.1 2400 31.0/48  426,00  5 Bgrassy dev.5f18d51 JA 2400 20.5/48  187,00  6 Nectar 0.1.4 2400 19.0/48  187,25  7 Prometheu...