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 4.1.0 - what's new?
- multilayer NNUE
- sparse affine for L1 matmul
- using tt score for razoring
- only doing tt cutoff if score <= alpha or cutnode
- fixed performance bug from accidental pass by value
- allow double/triple extensions even in PV
- update corrhists in singular search
- 2-ply contcorrhist
- corrplexity lmr and rfp
- lower rfp margin if opponent worsening
- probcut
Performance
+36STC againstv4.0(3728estimated CCRL blitz)+44LTC againstv4.0(3582estimated CCRL 40/15)
Bench: 7640206
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-vnni: Intel Icelake / AMD Zen 4 or later
- avx512: Intel Skylake / 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.
avx512 may be slower than avx2 on older processors (such as older Xeons).
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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