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Halogen 16.8.1 - pre-release version chess engine

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Halogen - UCI chess engine. The engine is constantly being developed by the author, and the latest stable version has risen to 26th place in the CEDR rankings.  We will be testing this version soon. Author: Kieren Pearson  Rating Chess Engines Diary CEDR=3850 Halogen what's new? - Remove unused ContinuationHistory::cont_hist_depth constant - Collapse the eight promotion cases in apply_move via a promo_type cast - Share castle-rights key logic between apply_move and get_fifty_move_adj_key_after - Reduce the dead king-bucket lazy-update branch to an assert - Rename assets/LICENCE to assets/LICENSE Bench: 6926560 Halogen 16.8.0 vs other engines: Caissa 2.0 61/122 +0 122 Games Stormphrax 8.0.0 52/102 +2 102 Games Hobbes 3.0 50.5/102 -1 102 Games Viridithas 20.0.0 47/96 -2 96 Games Reckless 0.10.0 26.8.26-dev 44/96 -8 96 Games Coda 0.9.4 41/92 -10 92 Games Obsidian 16.15 42/88 -4 88 Games Cinder 0.6.1 42/82 +2 82 Games Integral 8 JA 38/82 -6 82 Games Stockfish 19 JA 33...
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Triumviratus 8.1 20261102 - new version strong chess engine

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Triumviratus is a strong, UCI-compliant chess engine written in C++.  Author: Francesco ( fraTorsello)   Rating Chess Engines Diary CEDR=3949 Triumviratus what's new? Changes since the pre-release of 29 October Search Aspiration windows and optimism tuned (5 levers, SPSA run in the style of fishtest): +1.83 ± 2.78 Elo over 15,006 games at 8+0.08. Pruning of single moves tuned (22 levers: quiet and capture futility, move count, history pruning) and the history divisor per depth is now a parabola of our own instead of a 16-entry table: +1.71 ± 3.78 Elo over 7,734 games. Correction weights rebalanced around a third pair of moves, our move six plies back with the opponent's last move, with the other correction weights scaled down so that the total correction keeps its size: +1.13 ± 2.67 Elo over 16,586 games at 10+0.1. Time management The extra thinking time after a surprising move is now spent only when we are ahead on the clock, so that a side already short of time...
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Opus 5.5 wins Relegation Tournament by CEDR, 01.11.2026

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  Opus 5.5 wins another Relegation Tournament, advancing in the CEDR Chess Engine League qualifications. CEDR 903.628 games download (until 30.06.2026) All Games 129.244 CEDR from 01.11.2026 download . 💾 Tournament   games : 90 download 💻 Asus Zenbook, AMD Ryzen 9 6900HX, RAM 32,0 GB   🖬 GUI - GUI - Myracle, book:avt-2026b #chessenginesdiary Country - Poland, City - Malbork   🕓 Time 3'+3" Pl Engine Points % W-L-D note 1 Opus 5.5 15.0/18 83.3 +12-0=6 2 MORS 0.2.0 13.0/18 72.2 +8-0=10 3 CeylonDemon 3.3 12.0/18 66.7 +9-3=6 4 Fizbo 2 JA 9.5/18 52.8 +5-4=9 [1 time loss] 5 Sturddle 2.6.0 8.5/18 47.2 +3-4=11 6 Gecko 0.40.1 8.0/18 44.4 +3-5=10 [1 disconnect] 7 Zevra 2.7 7.0/18 38.9 +4-8=6 8 Monolith 3 6.0/18 33.3 +2-8=8 9 Aku 2025.7.9 6.0/18 33.3 +2-8=8 10 Inv...
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