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Luminex 5.13.0 - new version chess engine

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Luminex - a UCI chess engine written in C++23. All evaluation values are self-engineered from chess first principles.
Author: Cheng Chang

Luminex 5.13.0 what's new?

Forcing Line Deepening

This release introduces a genuinely novel search technique that tracks consecutive check sequences across plies, treating the forcing LINE as a whole rather than extending individual moves independently.

What's New

  • Forcing line extension: Tracks consecutive check plies. When 3+ plies are in check, extends depth to see the tactical conclusion — catching combinations that individual check extensions miss (+72.5 Elo).
  • Hindsight depth adjustment: Compensates for aggressive LMR reductions by adjusting child depth based on parent reduction and eval feedback (+14 Elo).
  • Eval-adaptive LMR: Uses eval-to-beta distance to modulate reductions — reduces more when clearly winning, less in critical positions.
  • King flight safety: Penalty for king with limited escape squares in king danger evaluation.
  • Prioritized capture checks: Captures that give check get ordering bonus in PMG phase 2.

Test Results

vs StashV20 (2509 Elo), tc=1+0.01:

RunWLDScoreCutechess Elo
Run 16612770.347-109.5 ± 49.9
Run 25513780.295-151.3 ± 52.0
Average121264150.321-130.4

Estimated Strength

~2380 CCRL Blitz equivalent (StashV20 2509 - 130 = ~2379, +170 Elo over v5.7.0)



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