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 2.061/122+0122 Games
Stormphrax 8.0.052/102+2102 Games
Hobbes 3.050.5/102-1102 Games
Viridithas 20.0.047/96-296 Games
Reckless 0.10.0 26.8.26-dev44/96-896 Games
Coda 0.9.441/92-1092 Games
Obsidian 16.1542/88-488 Games
Cinder 0.6.142/82+282 Games
Integral 8 JA38/82-682 Games
Stockfish 19 JA33.5/80-1380 Games
Berserk 1440.5/78+378 Games
Alexandria 9.1.029.5/60-160 Games
PlentyChess 8.0.526.5/60-760 Games
Triumviratus 8.0 2026-10-0925.5/60-960 Games
Tcheran 14.030.5/56+556 Games
Peras 3.6.129/56+256 Games
Quanticade Phoenix 4.0 Dev bc25.5/50+150 Games
Fritz 2124/46+246 Games
Evolution 1.019.5/46-746 Games
Alexandria 9.0.0 JA22.5/44+144 Games
Igel 3.7.023/42+442 Games
Gaia 4.3.320/40+040 Games
Stockfish 1916.5/40-740 Games
Devre 7.0 JA21/38+438 Games
Minke 7.0.019/38+038 Games
PlentyChess 8.0.0 JA18.5/38-138 Games
Raphael 4.3.0 dev-4a2c69317.5/38-338 Games
Mittens CEDR Windows29.5/36+2336 Games
Tcheran 13.022/36+836 Games
Arasan 26.120.5/36+536 Games
Incipit 0.5.019.5/36+336 Games
Chess-System-Tal 3.0018/36+036 Games
RubiChess 0108202618/36+036 Games
Igel 3.8.016/30+230 Games
Rebel 17.015/30+030 Games
Peras 3.6.015/30+030 Games
Zigqueen 6.4.014.5/30-130 Games
Zigqueen 6.5.014.5/30-130 Games
Pawnocchio 3.0-dev-74963fb14.5/30-130 Games
Pawnocchio 3.0-dev-ae35c6a13/30-430 Games
Renegade 1.3.114.5/26+326 Games
Astra 7.013/26+026 Games
Bread 4.0.014/22+622 Games
Dragon 3.311/22+022 Games
Crafty NNUE 25.6.115/20+1020 Games



All version: https://github.com/KierenP/Halogen/releases/tag/latest

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