New engine releases & news H1 2026

[NathanDrake]

Hi Graham, that's correct, it uses Stockfish's HalfKAv2_hm network (nn-b1a57edbea57.nnue) and the NNUE inference code from SF. The search, move generator, and all heuristics are my own work.

The release also includes an in-house net (nn-rubicon-v1.nnue), selectable via the UCI option. Though it currently runs about 60 Elo below the SF default net.

[NathanDrake]

Hi all,

I'd like to share Triumviratus 4.0, a free/open-source (GPLv3) UCI engine I've
been developing as a hobby project.

THANK YOU ! I added Triumviratus like 3rd guest in my RUST_TOURNAMENT. Together with the great CODA engine. The triumvirat is: CODA-Triumviratus-Cherry !

Thanks

[NathanDrake]

My understanding is that it uses SF nets.

Hi Graham, that's correctt. It uses Stockfish's HalfKAv2_hm network (nn-b1a57edbea57.nnue) and the NNUE inference code from SF.

The release also includes an in-house net (nn-rubicon-v1.nnue), selectable via UCI option. Though it currently runs about 60 Elo below the SF default net.

[Graham Banks]

My understanding is that it uses SF nets.

Hi Graham, that's correctt. It uses Stockfish's HalfKAv2_hm network (nn-b1a57edbea57.nnue) and the NNUE inference code from SF.

The release also includes an in-house net (nn-rubicon-v1.nnue), selectable via UCI option. Though it currently runs about 60 Elo below the SF default net.

So is the rubicon net one that you trained yourself?
What games did you use?
Sorry for all the questions.

[NathanDrake]

My understanding is that it uses SF nets.

Hi Graham, that's correctt. It uses Stockfish's HalfKAv2_hm network (nn-b1a57edbea57.nnue) and the NNUE inference code from SF.

The release also includes an in-house net (nn-rubicon-v1.nnue), selectable via UCI option. Though it currently runs about 60 Elo below the SF default net.

So is the rubicon net one that you trained yourself?
What games did you use?
Sorry for all the questions.

Yes, i trained it myself using T80 datasets and google cloud GPU for computing power.
No problems for the questions!

[Sylwy]

In repo version 4.0 (.exe-avx2) is in fact 3.9 ???

[NathanDrake]

In repo version 4.0 (.exe-avx2) is in fact 3.9 ???

No, it shouln't, why?
EDIT: i checked, it's just an error in the presentation screen. The version is actually the correct 4.0, I'll update as soon as possible. You can use it.

[Sylwy]

Some infos - v4.0:

-Intel i5-7400 (Kaby Lake);
-Windows 10 x64 - AVX2 build;
-both NNUEs present;
-v3.3 works;
-4.0 crashes after 2-3 seconds (in console mode);
-Arena 3.5.1 GUI shows Hash=0 (in engine window).

[Andres Valverde]

EveAnn 5.1 released

https://sites.google.com/view/dirtychess/dirtychess

New NN , HCE fixed. Estimated +15/20 ELO at long TC

[NathanDrake]

Some infos - v4.0:

-Intel i5-7400 (Kaby Lake);
-Windows 10 x64 - AVX2 build;
-both NNUEs present;
-v3.3 works;
-4.0 crashes after 2-3 seconds (in console mode);
-Arena 3.5.1 GUI shows Hash=0 (in engine window).

I just fixed the release number and recompiled. I am updating the release now.