Coiled

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Slinky Springs to Fame [1] 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 [2]. 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 [3] [4].

Features#

[5]

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

References#

1. ↑ Slinky Springs to Fame designed by Tobias Rehberger, Rhine–Herne Canal, Gasometer Oberhausen in the background with Wonders of Nature exhibition, Oberhausen, Germany, The Industrial Heritage Trail, Image by Gerd Isenberg, March 12, 2017, see also Image by Frank Vincentz, November 29, 2012, Category:Slinky Springs to Fame from Wikimedia Commons
2. ↑ Re: Coiled v.0.5 Release by Oscar Gavira, CCC, July 18, 2018
3. ↑ Re: Update: Coiled-NNUE 0.7 by Connor McMonigle, CCC, August 06, 2021
4. ↑ Coiled-NNUE/README.md at master · Oscar-Gavira/Coiled-NNUE · GitHub
5. ↑ Based on Coiled - Técnicas utilizadas

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