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Coiled,
an UCI compliant chess engine by Oscar Gavira, written in C, first released in 2013. Coiled 0.6, released in July 2018 is available as 32-bit and 64-bit executable for Windows ¹. Coiled-NNUE 0.7 was released in August 2021 as Open Source licensed under the GPL v3.0, using a Stockfish NNUE network with CFish derived probing code ^{2 3}.

Features

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Board Representation

• 8x8 Board
• Simple Move Generation

Search

• Iterative Deepening
• Aspiration Windows
• PVS / Alpha-Beta
• Repetitions
• Transposition Table
• Quiescence Search
• Selectivity
  • Extensions
    • Check Extensions
    • Passed Pawn to 7th Rank
  • Pruning
    • Futility Pruning
    • Mate Distance Pruning
    • Null Move Pruning (R = 3)
    • Static Exchange Evaluation
  • Reductions
    • Late Move Reductions
    • Razoring
• Move Ordering
  • Hash Move
  • PV-Move
  • Internal Iterative Deepening
  • MVV/LVA
  • Killer Heuristic
  • History Heuristic

Evaluation

• NNUE (Coiled-NNUE 0.7)
• Material
• Tapered Eval
• Piece-Square Tables
• Pawn Structure
  • Pawn Hash Table
  • Backward Pawn
  • Isolated Pawn
  • Doubled Pawn
  • Passed Pawn
  • Unstoppable Passer
  • Hidden Passed Pawn
  • Candidate Passed Pawn
  • Faker
• Bishop
  • Bishop Pair
  • Mobility
  • Trapped Bishop
  • Square Control
• Knight
  • Outposts
  • Mobility
  • Trapped Knight
  • Square Control
• Rook
  • On Open and Semi-Open File
  • Rook on Seventh Rank
  • Mobility
  • Trapped Rook
  • Square Control
• King Safety
  • Castling Rights
  • Pawn Shield
  • Pawn Storm
  • Attacking King Zone
  • King Tropism
• Endgame Interior Node Recognizer
  • Insufficient Material
  • KPK
  • KRK
  • KBNK
  • KQK
  • KBBK
  • Gaviota Tablebases

Misc

• Opening Book (SQLite format)
• Pondering
• UCI

See also

• Loop

Forum Posts

• Hispanic chess engines + Winboard Zeta Pack number 18 by Pedro Castro, CCC, August 14, 2013
• Coiled 0.2b by Oscar Gavira, CCC, July 22, 2014
• Coiled 0.4 by Oscar Gavira, CCC, September 12, 2016
• Coiled v.0.5 Release by Oscar Gavira, CCC, July 17, 2018

Re: Coiled v.0.5 Release by Oscar Gavira, CCC, July 18, 2018

• Update: Coiled-NNUE 0.7 by Oscar Gavira, CCC, August 06, 2021

External Links

Chess Engine

• Coiled - Información y descargar. Motor de ajedrez UCI (Spanish)
• GitHub - Oscar-Gavira/Coiled-NNUE: Motor de ajedrez de protocolo UCI
• Coiled in CCRL Blitz

Misc

• Coiled Spring by Pentala Harikrishna, Chess.com, September 12, 2011
• coiled - Wiktionary
• coil - Wiktionary
• Coil from Wikipedia
• Coiled coil from Wikipedia
• Coiled coil filament from Wikipedia
• Coil spring from Wikipedia
• Electromagnetic coil from Wikipedia
• Chemical oxygen iodine laser (COIL) from Wikipedia
• Coiled bodies from Wikipedia
• Feverkin - Coiled Corner (feat. Bijou), YouTube Video

Watch on YouTube

References