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 3.3 - what's new?
Non-functional changes
- uci setoption now ignores upper/lower casing in option names
- added wait, ceval (corrected eval), fen, board, and datagen commands to uci
v3.3
- increased NNUE input bucket count
- added random fen skipping and larger batch size when training NNUE
- implemented NNUE finetuning
- implemented pawn, major, and nonpawn correction history
- implemented 1-ply continuation correction history
- made movegen 8% faster (or rather, undid the implicit 8% slowdown from last release)
- implemented not doing fp and qsfp if a move directly gives check
- implemented adding bonus to quiet moves that directly gives check
- implemented various nmp reductions
- implemented halving se margin if tt score exact
- implemented multicut
- implemented storing static eval in tt
- implemented tt clusters
- implemented material and halfmove clock eval scaling
- tuned parameters using SPSA
Performance
+133STC againstv3.1(3687estimated CCRL blitz)+98LTC againstv3.1(3554estimated CCRL 40/15)
Bench: 6402583
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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