Triumviratus 4.1 - new version chess engine

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

Triumviratus 4.1 what's new?

Triumviratus 4.1 — Search co-tune
+35.0 ±17.9 Elo over 4.0 at 20+0.2 (LOS ~100%, fastchess, UHO_2024 +080/+099), SPRT-verified.

What changed
Large SPSA co-tune (~10k iterations, 18 parameters): pruning margins, history weights, LMR + SF-style depth-pruning block.
No new features vs 4.0 — same search architecture, same NNUE (nn-b1a57edbea57.nnue). Just better-tuned constants.
Binaries
file target
Triumviratus_4.1_avx512.exe Intel Ice Lake+ / AMD Zen4+ (AVX-512 + VNNI + BMI2)
Triumviratus_4.1_avx2.exe Intel Haswell+ / AMD Zen+ (AVX2 + BMI2)
Both clang-cl + ThinLTO + IR-PGO.

Setup
Place nn-b1a57edbea57.nnue and nn-baff1ede1f90.nnue next to the exe.


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