RubiChess

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Macrothylacia rubi ¹

RubiChess,
an UCI compliant open source chess engine by Andreas Matthies, written in C++, licensed under the GPL v3.0. RubiChess started in 2017 as 0x88 engine and soon evolved to a bitboard engine first using rotated bitboards and subsequently magic bitboards (about 24% faster) to determine sliding piece attacks ¹. In September 2020, Andreas Matthies announced RubiChess NNUE ².

Features

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Board Representation

• Classical Bitboard Board-Definition
• Plain Magic Bitboards

Search

• Lazy SMP (1.3)
• Iterative Deepening
• Aspiration Windows
• Alpha-Beta
• Principal Variation Search
• Transposition Table
• Selectivity
  • Null Move Pruning with Verification
  • Late Move Reductions
  • ProbCut (1.3)
  • Futility Pruning
  • Extended Futility Pruning
  • Late Move Pruning
  • Reverse Futility Pruning
  • Razoring
  • Singular Extensions
  • Quiescence Search
  • SEE Pruning
  • Delta Pruning
• Move Ordering
  • PV-Move
  • Internal Iterative Deepening
  • Captures by MVV/LVA
  • Static Exchange Evaluation
  • Killer Heuristic
  • History Heuristic
  • Counter Moves History

Evaluation

• NNUE (RubiChess NNUE)
• Texel's Tuning Method
• Tapered Eval
• Material
• Piece-Square Tables
• Mobility
• Rooks on (Semi) Open Files
• Hanging Pieces
• Pinned Pieces
• Pawn/King Hash Table
• Pawn Structure
  • Phalanx
  • Passed Pawn
  • Candidate Passed Pawn
• King Safety
  • Attacks
  • Pawn Storm
• Tempo Bonus

Misc

• Syzygy Bases

Forum Posts

2018 ...

• RubiChess 0.9 is out by Andreas Matthies, CCC, May 29, 2018
• RubiChess 1.1 by Andreas Matthies, CCC, October 03, 2018
• RubiChess 1.3 by Andreas Matthies, CCC, February 11, 2019
• Rubichess 1.4 by Ferdinand Mosca, CCC, May 31, 2019
• Re: New engine releases 2019 by Andreas Matthies, CCC, October 17, 2019

2020 ...

• Re: Orion 0.7 : NNUE experiment by Andreas Matthies, CCC, August 21, 2020
• RubiChess NNUE player implemented by Andreas Matthies, CCC, September 06, 2020

Re: RubiChess NNUE player implemented by Andreas Matthies, CCC, November 01, 2020

• Re: New engine releases & news 2021 by Andreas Matthies, CCC, April 14, 2021
• Rubichess NN questions by Jon Dart, CCC, April 23, 2021 » NNUE
• Re: will Tcec allow Stockfish with a Leela net to play? by Connor McMonigle, CCC, June 17, 2021 » NNUE
• RubiChess 2.2 by Boban Stanojević, CCC, July 07, 2021

External Links

Chess Engine

• GitHub - Matthies/RubiChess: Another chess engine

GitHub - Matthies/NN

• RubiChess in CCRL 40/40

Misc

• rubi - Wiktionary
• Rubí from Wikipedia
• Rubí Rodríguez from Wikipedia » Rubí Rodríguez
• Rubí, Barcelona from Wikipedia
• Ruby from Wikipedia
• Ruby (disambiguation) from Wikipedia
• Ruby character from Wikipedia
• Ruby (programming language) from Wikipedia » Ruby
• The Rolling Stones - Ruby Tuesday, Official 1991, YouTube Video

Watch on YouTube

References