Clover

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Clover ¹

Clover,
an UCI compliant open source chess engine by Luca Metehau, written in C++. Clover was first released in April 2021 ¹, hosted on GitHub. In January 2022, Clover 3.0 was released featuring NNUE instead of hand crafted evaluation ².

Features

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Board Representation

• Bitboards
• Magic Bitboards

Search

• Lazy SMP
• Iterative Deepening
• Aspiration Windows
• Principal Variation Search
• Shared Hash Table
• Move Ordering
  • Hash Move
  • Captures by MVV/LVA
  • Static Exchange Evaluation
  • Killer Heuristic
  • History Heuristic
  • Countermove Heuristic
• Selectivity
  • Mate Distance Pruning
  • Razoring
  • Static Null Move Pruning
  • Adaptive Null Move Pruning
  • ProbCut
  • Futility Pruning
  • Late Move Pruning
  • SEE Pruning
  • Singular Extensions
  • Check Extensions
  • Late Move Reductions
  • Quiescence Search

Evaluation

• NNUE (Clover 3.0)
• Tapered Eval
• Material
  • Bishop Pair
• Piece-Square Tables
• Mobility
  • Trapped Pieces
  • Rooks on (Semi) Open Files
• Outposts
• Pawn Structure
  • Backward Pawn
  • Doubled Pawn
  • Isolated Pawn
  • Connected Pawns
  • Passed Pawn
• King Safety
  • Attacking King Zone
  • Pawn Shelter
• Tempo

Misc

• Texel's Tuning Method
• Syzygy Bases via Fathom
• Perft

Forum Posts

• New engine: Clover by Luca Metehau, CCC, April 23, 2021
• New engine: Clover by Luca Metehau, CCC, April 23, 2021
• Re: New engine: Clover by Luca Metehau, CCC, January 23, 2022

Clover 3.1 by Luca Metehau, CCC, March 26, 2022

External Links

Chess Engine

• GitHub - lucametehau / CloverEngine

Misc

• clover - Wiktionary
• Clover from Wikipedia
• Clover (disambiguation) from Wikipedia
• Tommy James and the Shondells - Crimson and Clover (1968), YouTube Video

Watch on YouTube

References