Author: Kieren Pearson Rating Chess Engines Diary CEDR=3698
Halogen 16. what's new?
Elo gain compared to Halogen 15:
SMP LTC:
Elo | 89.85 +- 10.37 (95%)
Conf | 20.0+0.20s Threads=8 Hash=256MB
Games | N: 1000 W: 365 L: 112 D: 523
Penta | [0, 32, 188, 275, 5]
http://localhost:8000/test/100/
SMP STC:
Elo | 82.91 +- 5.35 (95%)
Conf | 5.0+0.05s Threads=8 Hash=64MB
Games | N: 4338 W: 1640 L: 624 D: 2074
Penta | [8, 159, 873, 1067, 62]
http://localhost:8000/test/99/
LTC:
Elo | 58.57 +- 4.91 (95%)
Conf | 40.0+0.40s Threads=1 Hash=64MB
Games | N: 5012 W: 1654 L: 817 D: 2541
Penta | [7, 273, 1144, 1040, 42]
http://localhost:8000/test/98/
STC:
Elo | 57.16 +- 5.42 (95%)
Conf | 8.0+0.08s Threads=1 Hash=8MB
Games | N: 5066 W: 1748 L: 922 D: 2396
Penta | [22, 318, 1107, 984, 102]
http://localhost:8000/test/97/
- SPSA LTC SMP tune by @KierenP in #823
- Add razoring to search by @mike-koala-bear in #817
- Add prior-countermove heuristic by @KierenP in #826
- Apply PCM for all quiet histories by @KierenP in #829
- Add an extra constant margin in NMP fail high check by @ProgramciDusunur in #833
- Implement 'fail-medium' in search by @KierenP in #837
- Allow negative LMR reduction for PV nodes by @KierenP in #838
- SPSA LTC SMP Tune by @KierenP in #840
- Don't allow LMR to drop into qsearch by @KierenP in #839
- Perform zero width LMR researches at depth 1 by @KierenP in #841
- Share corrhist between threads per numa node by @KierenP in #842
- Update default network to 4264b7e5.nn by @KierenP in #844
- Update default network to c57e7be4.nn by @KierenP in #857
- Update default network to 150521a9.nn by @KierenP in #858
Which binary to choose?
Below are prebuild binaries for Windows, Linux, and MacOS platforms, for a variety of CPU architectures. Please select the most modern target for your architecture.
| Target | x86 Intel CPU | x86 AMD CPU | ARM CPU |
|---|---|---|---|
| Legacy | Any 64 bit | Any 64 bit | N/A |
| SSE4 | Nehalem (2008) | Bulldozer (2011) | N/A |
| AVX | Sandy Bridge (2011) | Piledriver (2012) | N/A |
| AVX2 | Haswell (2013) | Excavator (2015) | N/A |
| AVX2 PEXT | Haswell (2013) | Zen 3 (2020) | N/A |
| AVX512 | Skylake (2017) | Zen 4 (2022) | N/A |
| AVX512VNNI | Ice Lake (2019) | Zen 5 (2024) | N/A |
| Neon DOTPROD | N/A | N/A | ARMv8.2+ (Apple M2+) |
Halogen 16 vs other engines:
| Tarnished 5.0 | 15/30 | +0 | 30 games |
| Caissa 1.24 JA | 14.5/26 | +3 | 26 games |
| Pawnocchio 1.9.2 | 13.5/26 | +1 | 26 games |
| Dragon 3.3 | 12.5/26 | -1 | 26 games |
| Quanticade Cronus 3.0 | 12/22 | +2 | 22 games |
| Clover 9.1 JA | 11/22 | +0 | 22 games |
| Viridithas 19.0.1 | 10.5/22 | -1 | 22 games |
| Stockfish 18 JA | 9/20 | -2 | 20 games |
| Reckless 0.9.0 dev-2a847427 | 6.5/16 | -3 | 16 games |
| Bagatur 5.4 | 10.5/12 | +9 | 12 games |
| PZChessBot 6.0 JA | 8.5/12 | +5 | 12 games |
| Motor 0.9.0 | 7/12 | +2 | 12 games |
| Integral 7.0.0 JA | 6/12 | +0 | 12 games |
| Alexandria 8.1.12 | 6/12 | +0 | 12 games |
| Horsie 1.1.0 JA | 6/12 | +0 | 12 games |
| Obsidian dev-16.15 SE | 5.5/12 | -1 | 12 games |
| Berserk 20250606 | 4.5/12 | -3 | 12 games |
| PlentyChess 7.0.55 | 4.5/12 | -3 | 12 games |
| Rebel EAS 3.0 | 6.5/10 | +3 | 10 games |
| DON dev-20260222 | 5/10 | +0 | 10 games |
| Artemis 27TR PrO | 4.5/10 | -1 | 10 games |
All version: https://github.com/KierenP/Halogen/releases/tag/latest
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