Raphael is a hobby project that is still a work in progress, but it will be updated as time goes by. It is nowhere near as competitive as some of the other chess engines out there, but it is strong enough to beat most humans with ease.
Author: Rei Meguro
Raphael 4.2.0 - what's new?
Non-functional changes
dev version numbers now contain commit sha
added GitHub Actions to automatically publish pre-releases
added go perft [depth] command
added arch autodetection in Makefile
removed Skylake target
added option to compile HCE and singlelayer version v4.2
implemented threat inputs for NNUE
implemented threat input weights prefetching
SPSA tuned at ltc
fixed various incorrect draw evaluation for winning positions
added upcoming cycle detection
use tt score in probcut
mix corrplexity in ldse margin
mix history into lmp margin
sf style thread voting
shared corrhists
Performance
+57 STC against v4.1 (3740 estimated CCRL blitz)
+75 LTC against v4.1 (3600 estimated CCRL 40/15)
Bench: 10998114
Binary Guide
If you are unsure which binary to use, start from the top and go down until you find a binary that doesn't crash.
Note that all binaries are for x86 systems.
avx512: Intel Icelake / AMD Zen 4 or later
avx2-bmi2: Intel Haswell / AMD Zen 3 or later
avx2: Intel Haswell / AMD Zen 1 or later
Generally avoid avx2-bmi2 on Zen 1/2 AMD CPUs as they can be slower than the avx2 binary.
Raphael 3.0.0 JA vs other engines:
| Rusty-rival 1.0.30 rc3 | 4/4 | +4 | 4 games |
| FrankyCPP 1.2 | 4/4 | +4 | 4 games |
| Human Chess Engine 0.1 JA | 4/4 | +4 | 4 games |
| Anodos 1.2.0 | 4/4 | +4 | 4 games |
| Critter 1.6a | 3.5/4 | +3 | 4 games |
| Chessnix 1.3 | 1.5/4 | -1 | 4 games |
| Kociolek 2.1 JA | 1.5/4 | -1 | 4 games |
| PZChessBot 6.1 | 1/4 | -2 | 4 games |
| Caligula 6.0 | 1/4 | -2 | 4 games |
| Bagatur 5.4 | 1/4 | -2 | 4 games |
| Minke 5.0.0 | 0.5/4 | -3 | 4 games |
| Odonata 1.1.0 | 0.5/4 | -3 | 4 games |
| Zangdar 6.1 | 0.5/4 | -3 | 4 games |
| Sturddle 2.5.0 | 0.5/4 | -3 | 4 games |
| Stockfish 18 JA | 0/4 | -4 | 4 games |
| DON dev-20260215 | 0/4 | -4 | 4 games |
| Tarnished 5.0 | 0/4 | -4 | 4 games |
| Halogen 16.0.0 | 0/4 | -4 | 4 games |
| HypnoS EN 1.0 | 0/4 | -4 | 4 games |
| VietCoffee 1.0.8 JA | 3/3 | +3 | 3 games |
| Vajra 2.0 | 3/3 | +3 | 3 games |
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