Catalyst is a UCI-compliant chess engine combining NNUE evaluation with a modern, highly optimized search.
Author: Chad AKT (AnanyTanwar)
Catalyst 2.0.0 what's new?
A major architectural overhaul. New NNUE, refined search, and over +230 Elo gained against v1 in head-to-head testing.
What's New
New NNUE Architecture
Upgraded from 768 → 64 to (768 → 256) × 2 → 8
8-bucket material-based output — specialized weights for opening, middlegame, and endgame
Dual-perspective accumulator with correct mirror-free White/Black indexing
Quantization tuned to QA=255, QB=64 for maximum throughput on modern CPUs
SCReLU activation throughout
Measured Elo Gain
Head-to-head vs Catalyst v1 · 30+0.3 time control · 200 games
Metric Result
Elo Gain +230.16 ± 50.29
Win Rate 79.00%
Game Record 147W · 22D · 31L
Score 158.0 / 200
LOS 100.00%
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