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



Triumviratus 4.2 - new version chess engine

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Triumviratus is a strong, UCI-compliant chess engine written in C++. 
Author: Francesco (fraTorsello)

Triumviratus 4.2 what's new?

The first own-network build of Triumviratus. It evaluates with our own rubicon NNUE, trained from scratch on T80 data — no Stockfish network is shipped. The classical search is unchanged from 4.1; this release is about the network.

What's in this release
Two builds (pick one for your CPU). Each archive contains the engine + the network + a short README.

Archive CPU requirement
Triumviratus_4.2_avx512.zip AVX-512 + BMI2 — Intel Ice Lake+/Skylake-X, AMD Zen 4+
Triumviratus_4.2_avx2.zip AVX2 + BMI2 — Intel Haswell 2013+, AMD Zen+
BMI2 (PEXT) is required. If the AVX-512 build won't start, use the AVX2 one.

Setup
Unzip.
Keep nn-rubicon-v1.nnue in the same folder as the executable (it's already in the archive).
Add the .exe to your UCI GUI (Cute Chess, Banksia, Arena, …).
Notes for testers
100% own network. nn-rubicon-v1.nnue is our own NNUE (own lineage), not a Stockfish net. Big-net-only by default (UseSmallNet off).
Strength vs 4.1: the own network costs about −39 Elo vs the Stockfish-net 4.1 at 12+0.12 — the deliberate, accepted price of a fully own-lineage build. Search and speed are unchanged.
Eval retuned for the new net: the NNUE post-processing constants were re-tuned (SPSA) for rubicon, since a different network wants a different eval-search coupling.
Built with clang-cl + ThinLTO + profile-guided optimization.


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