Raphael 3.2 - new version chess engine

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 3.2 - what's new?

Non-functional changes

• fixed compilation errors on some versions of g++

v3.2

• increased max depth to 249
• trained NNUE on dfrc positions
• increased NNUE HL size
• implemented input bucket NNUE with finny tables
• implemented node, bestmove stability, and score stability tm
• implemented storing into tt during qsearch
• implemented tt move ordering in qsearch
• implemented check evasions in qsearch
• implemented late move pruning in qsearch
• implemented improving rfp
• implemented noisy, check, cutnode, history, and improving lmr
• implemented 1, 2, and 4-ply conthist
• updated how history bonuses and penalties are applied
• implemented threats in quiet history
• fixed SEE for pins, capturing with king, and castling

Performance

• +106 STC against v3.1 (3612 estimated CCRL blitz)
• +82 LTC against v3.1 (3498 estimated CCRL 40/15)

Bench: 8658709

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

Raphael 3.2 download  mirror