Halogen 15.4.3 - new version chess engine
Author: Kieren Pearson Rating Chess Engines Diary CEDR=3685
Halogen 15. what's new?
Elo gaining patches:
Apply 4-ply continuation history for quiet move ordering by @KierenP in #695
Increase RFP margin for positions with active threats that need to be resolved by @KierenP in #696
SPSA LTC tune by @KierenP in #697
Add Continuation Correction History by @KierenP in #698
Threat history should consider all threats, on both from and to square by @KierenP in #699
Include Knight capture Bishop as a threat for threat calculations by @KierenP in #700
Reduce search depth on root fail high by @KierenP in #701
Apply double negative extensions for non-singular cut ndoes by @KierenP in #702
Apply double negative extensions to near multi-cut nodes by @KierenP in #703
SPSA LTC tune by @KierenP in #705
Adjust good loud move margin to -100 by @KierenP in #710
Scale good loud SEE margin by move history by @KierenP in #712
Use AVX512_VBMI2 instructions to speed up movegen by @KierenP in #717
Use compress_epi16 to process 32 blocks of 4 FT activations at once by @KierenP in #719
SPSA LTC tune by @KierenP in #721
Make qsearch detect checkmate positions by @KierenP in #725
Randomize all draw scores by @KierenP in #730
Prefetch TT entries in qsearch by @KierenP in #728
Add ProbCut heuristic by @KierenP in #734
Hoist pinned checks in movegen by @87flowers in #735
Elo gain compared to Halogen 14:
Elo | 33.74 +- 4.79 (95%)
Conf | 40.0+0.40s Threads=1 Hash=8MB
Games | N: 5000 W: 1442 L: 958 D: 2600
Penta | [10, 368, 1262, 848, 12]
http://chess.grantnet.us/test/40085/
Halogen 14 vs other engines:
| Fritz 20 | 40.5/99 | -18 | 99 Games |
| Uralochka 3.42 dev14 | 2.5/4 | +1 | 4 Games |
| Booot 7.4 | 2/4 | +0 | 4 Games |
| Berserk 20250622 | 2/4 | +0 | 4 Games |
| Astra 6.1.1 | 2/4 | +0 | 4 Games |
| Clarity 8.0.0 JA | 2/4 | +0 | 4 Games |
| Titan 1.1.0 | 2/4 | +0 | 4 Games |
| Heimdall 1.4.0 | 2/4 | +0 | 4 Games |
| Starzix 6.1 JA | 2/4 | +0 | 4 Games |
| Igel 3.6.3 JA | 2/4 | +0 | 4 Games |
| RubiChess 20250606 JA | 2/4 | +0 | 4 Games |
| Lizard 11.2 | 2/4 | +0 | 4 Games |
| Motor 0.9.0 | 2/4 | +0 | 4 Games |
| Revenge 4.0 | 2/4 | +0 | 4 Games |
| Pawnocchio 1.8 | 2/4 | +0 | 4 Games |
| Alexandria 8.0.0 JA | 2/4 | +0 | 4 Games |
| Viridithas 18.0.0 JA | 1.5/4 | -1 | 4 Games |
| Integral 7.0.0 JA | 1.5/4 | -1 | 4 Games |
| Horsie 1.1.0 | 1.5/4 | -1 | 4 Games |
| Stormphrax 7.0.0 JA | 1.5/4 | -1 | 4 Games |
| Clover 8.2 JA | 1.5/4 | -1 | 4 Games |
All version: https://github.com/KierenP/Halogen/releases/tag/latest
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