Patricia 2.0 - likely the most aggressive chess engine ever made

[dkappe]

It’s also possible to use lc0 with the small bad gyal, mean girl, etc. nets and reducing the search to 2000 to 5000 nodes. All doable on a cpu (no gpu needed). The result is much better than trying to inject blunders into an AB engine.

[Whiskers]

Any plans on making a SMP version?

Yes, I do, thanks for asking.

[BrendanJNorman]

Any plans on making a SMP version?

Yes, I do, thanks for asking.

Will there also be multiPV analysis capabilities in the future?

Imagine being able to see this girl's top 5 move choices!

[BrendanJNorman]

It’s also possible to use lc0 with the small bad gyal, mean girl, etc. nets and reducing the search to 2000 to 5000 nodes. All doable on a cpu (no gpu needed). The result is much better than trying to inject blunders into an AB engine.

Is Evil Gyal still the one with the most "sleazy human blitz" influence?

[Whiskers]

Any plans on making a SMP version?

Yes, I do, thanks for asking.

Will there also be multiPV analysis capabilities in the future?

Imagine being able to see this girl's top 5 move choices!

I think so. It's not a super high priority but if I remember to get around to it it's a useful and fun feature.
I also definitely have to do some eval normalization when it comes to Patricia's scores before it becomes a useful engine for actual analysis, they're all over the place right now and generally way inflated.

[Damas Clásicas]

First, many thanks for this engine. It's always a pleasure to see engines that can do different things, in this case having a great playing style!

But I'm having problems in Fritz GUI. After some time Patricia 2.0 crashes. And with Patricia 1.0 curiously everything works fine. No problems at all. BTW, both engines display only two moves in its PV. Do you think it's possible to [fix] improve that for the next update?

[Whiskers]

First, many thanks for this engine. It's always a pleasure to see engines that can do different things, in this case having a great playing style!

But I'm having problems in Fritz GUI. After some time Patricia 2.0 crashes. And with Patricia 1.0 curiously everything works fine. No problems at all. BTW, both engines display only two moves in its PV. Do you think it's possible to [fix] improve that for the next update?

Does it crash while searching a position? If so could you give an FEN that makes Patricia crash please? Thanks so much.

[Whiskers]

And yes, support for a longer PV is indeed planned.

[pohl4711]

Another great game of Patricia 2.0 from my ongoing testrun.
Balanced openings. Engines started thinking from move 9 of white.
This engine is from another planet...

[pgn]
[Event "Patricia 2.0 testing"]
[Site "?"]
[Date "2024.04.05"]
[Round "132"]
[White "Patricia 2.0"]
[Black "Nirvanachess 2.4"]
[Result "1-0"]
[ECO "A46"]
[Opening "Queen's pawn game"]
[TimeControl "180+1"]
[PlyCount "65"]
[GameDuration "00:04:38"]
[GameEndTime "2024-04-05T11:41:53.537 Mitteleuropäische Sommerzeit"]
[GameStartTime "2024-04-05T11:37:15.077 Mitteleuropäische Sommerzeit"]

1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. e3 Bb7 5. Nc3 d5 6. cxd5 exd5 7. Bb5+ c6 8.
Bd3 Bb4 9. a3 Be7 10. g4 h6 11. Rg1 c5 12. Qc2 Nfd7 13. h4 Bxh4 14. Bd2 O-O
15. g5 hxg5 16. Bh7+ Kh8 17. O-O-O Nf6 18. Bf5 Ng8 19. e4 cxd4 20. Nxh4
gxh4 21. Rxg7 Kxg7 22. Rg1+ Kh8 23. Qd1 Nf6 24. Rh1 Re8 25. Rxh4+ Kg8 26.
Bh6 Nxe4 27. Nxe4 Qc8+ 28. Bxc8 Rxc8+ 29. Kb1 Rc1+ 30. Qxc1 f6 31. Qc7 Nd7
32. Qxd7 dxe4 33. Qg7# 1-0
[/pgn]

[Whiskers]

Some people are talking about Patricia crashing occasionally.
If someone can reproduce a crash I would really appreciate it (for example an FEN where Patricia crashes while searching); I found a bug but don't know if it was the problem.