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Raphael 3.3 - 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 3.3 - 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

  • +133 STC against v3.1 (3687 estimated CCRL blitz)
  • +98 LTC against v3.1 (3554 estimated CCRL 40/15)

Bench: 6402583


Raphael 3.0.0 JA vs other engines:

Rusty-rival 1.0.30 rc34/4+44 games
FrankyCPP 1.24/4+44 games
Human Chess Engine 0.1 JA4/4+44 games
Anodos 1.2.04/4+44 games
Critter 1.6a3.5/4+34 games
Chessnix 1.31.5/4-14 games
Kociolek 2.1 JA1.5/4-14 games
PZChessBot 6.11/4-24 games
Caligula 6.01/4-24 games
Bagatur 5.41/4-24 games
Minke 5.0.00.5/4-34 games
Odonata 1.1.00.5/4-34 games
Zangdar 6.10.5/4-34 games
Sturddle 2.5.00.5/4-34 games
Stockfish 18 JA0/4-44 games
DON dev-202602150/4-44 games
Tarnished 5.00/4-44 games
Halogen 16.0.00/4-44 games
HypnoS EN 1.00/4-44 games
VietCoffee 1.0.8 JA3/3+33 games
Vajra 2.03/3+33 games


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