Patricia - UCI chess engine
Author: Adam Kulju Rating Chess Engines Diary CEDR=3439
Patricia 5 what's now?
Sorry about the wait; I had hoped to train a new set of networks before releasing Patricia 5.0, but couldn't wait any longer.
+70 elo LTC
+60k EAS
Tablebase support
Improved (and incredibly aggressive) human mode - check it out!
The main feature added was switching to an evaluation involving 3 separate neural networks with different aggression/strength tradeoffs, which increased aggression overall without sacrificing strength. Patricia swaps between them based on aspects of the position such as material and evaluation - e.g. when in a winning middlegame, use the most aggressive net to search for a knockout blow.
Many search features were added as well, though after little progress these last two months I don't remember them well enough to make a comprehensive list.
It's been a joy to watch Patricia play some incredible games at CCC and TCEC - she's been able to spring unexpected winning sacrifices on top engines such as Torch a few times which is quite the achievement.
Binaries
Use v3 (avx2) for most computers, and use v2 (SSE) for very old models.
A Note on Antivirus Software
I've been getting a lot of reports of antivirus software flagging Patricia as a virus. She is not a virus and this problem happens to most chess engines, but it's been especially annoying and persistent with her for some reason. If you're struggling with getting an executable due to this let me know and I'll see what I can do to help you out.
Patricia 4 vs other engines:
| Halogen 12.12.3 JA | 26.5/68 | -15 | 68 Games |
| Berserk 20241119 | 13.5/62 | -35 | 62 Games |
| Clover 8.1 | 9/60 | -42 | 60 Games |
| Obsidian 14.07 SE | 7.5/60 | -45 | 60 Games |
| Sting Black Hole 8 | 15.5/20 | +11 | 20 Games |
| Arasan 25.0 | 7/20 | -6 | 20 Games |
| Stockfish 17 | 1.5/16 | -13 | 16 Games |
| Obsidian 14.0 | 1/16 | -14 | 16 Games |
| Uralochka 3.42 dev7 | 3.5/14 | -7 | 14 Games |
| Tucano 12 | 12/12 | +12 | 12 Games |
| Lizard 11.1.5 JA | 7.5/12 | +3 | 12 Games |
| Arasan 24.2.2 JA | 3.5/12 | -5 | 12 Games |
| Equisetum 1.15 JA | 3.5/12 | -5 | 12 Games |
| SF-PRO 04.12.2024 | 2/12 | -8 | 12 Games |
| Dark SisTer 8.0 | 2/12 | -8 | 12 Games |
| Cool Iris 13.90 | 1.5/12 | -9 | 12 Games |
| SpecTral 8.0 | 1.5/12 | -9 | 12 Games |
| Big Yuli GM 221024 | 1/12 | -10 | 12 Games |
| SF-PRO2 04.12.2024 | 0.5/12 | -11 | 12 Games |
| Rhetoric 1.4.3 | 9/10 | +8 | 10 Games |
| Heimdall 1.2.2 | 6/10 | +2 | 10 Games |
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