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============================== My email: jotes@go2.pl



Patricia 5 - new version chess engine


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 JA26.5/68-1568 Games
Berserk 2024111913.5/62-3562 Games
Clover 8.19/60-4260 Games
Obsidian 14.07 SE7.5/60-4560 Games
Sting Black Hole 815.5/20+1120 Games
Arasan 25.07/20-620 Games
Stockfish 171.5/16-1316 Games
Obsidian 14.01/16-1416 Games
Uralochka 3.42 dev73.5/14-714 Games
Tucano 1212/12+1212 Games
Lizard 11.1.5 JA7.5/12+312 Games
Arasan 24.2.2 JA3.5/12-512 Games
Equisetum 1.15 JA3.5/12-512 Games
SF-PRO 04.12.20242/12-812 Games
Dark SisTer 8.02/12-812 Games
Cool Iris 13.901.5/12-912 Games
SpecTral 8.01.5/12-912 Games
Big Yuli GM 2210241/12-1012 Games
SF-PRO2 04.12.20240.5/12-1112 Games
Rhetoric 1.4.39/10+810 Games
Heimdall 1.2.26/10+210 Games


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