RubiChess

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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 .

Features

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

• 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

• 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

External Links

Chess Engine

• GitHub - Matthies/RubiChess: Another chess engine
• RubiChess in CCRL 40/40

Misc

• Rubí from Wikipedia
• Rubí Rodríguez from Wikipedia » Rubí Rodríguez
• Rubí, Barcelona from Wikipedia
• Ruby character from Wikipedia
• Rubi – Wikipedia.de (German)

References

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