Luminex - a UCI chess engine written in C++23. All evaluation values are self-engineered from chess first principles.
Author: Cheng Chang
Luminex 5.15.0 what's new?
Handcrafted-evaluation refinements — sharper passed-pawn scoring and a trade-down bonus.
What's New
- Passed-pawn path decomposition (+15 Elo): passed pawns are now scored by decomposing the path to promotion into blockade, safe-advance, and clear-path components instead of a single flat bonus.
- Trade-down bonus (+12 Elo): the winning side gains a bonus as non-pawn material comes off the board — converting a material advantage into won endgames.
- Transposition table tuned to 128 MB default (less L2/L3 cache pressure at bullet time controls).
- C++23 modernization:
std::format,std::to_underlying, defaultedoperator==,[[assume]],std::byteswap. - NNUE evaluation (experimental): an NNUE inference path (HalfKAv2 features, AVX-512/VNNI) is available via
UseNNUE. It is competitive with HCE at equal depth; HCE remains the default and recommended path.
Test Results
| Opponent | Time Control | Games | W–D–L | Score | Est. Elo |
|---|---|---|---|---|---|
| Stash V20 (~2509) | 1+0.01 bullet | 200 | 80–18–102 | 44.5% | ~2470 |
Estimated Strength
~2470 Elo (blitz) — ≈ Stash V20 (2509) − 40.
Binaries
| Platform | File |
|---|---|
| Windows x64 | luminex-5.15.0-windows-x64.exe |
| Linux x64 | luminex-5.15.0-linux-x64 |
Usage
UCI engine. Default is handcrafted evaluation (HCE):
position startpos
go depth 20
Optional NNUE (experimental): set option UseNNUE true and option NNUEFile <path-to-net>.
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