Pawny

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Pawny ¹

Pawny,
an UCI compatible open source chess engine by Mincho Georgiev, written in C and licensed under the GPL, first released in September 2009. Pawny's board was initially represented as 16x16 array, filled with piece codes, complemented with piece lists as array of linked lists ¹. Pawny 1.0, released in May 2013, is an entirely rewritten engine based on bitboards ².

Features

Board Representation

• Bitboards
• Magic Bitboards

Search

• Iterative Deepening
• Aspiration Windows
• Alpha-Beta
• Principal Variation Search
• Transposition Table
• Move Ordering
  • Internal Iterative Deepening
  • Static Exchange Evaluation
  • Killer Heuristic
  • History Heuristic
• Selectivity
  • Fractional Extensions
  • Razoring
  • Adaptive Null Move Pruning
  • Late Move Reductions
  • Futility Pruning
  • Quiescence Search
  • Delta Pruning based on Static Exchange Evaluation

Evaluation

• Tapered Eval
• Material
• Piece-Square Tables
• Mobility
  • Trapped Pieces
  • Rook on (Semi) Open File
  • Rook on Seventh
  • Center Control
• Outposts
• Pawn Structure
  • Backward Pawn
  • Doubled Pawn
  • Isolated Pawn
  • Connected Pawns
  • Passed Pawn
• King Safety
  • Attacking King Zone
  • Pawn Shelter
  • Square Control

Misc

• Gaviota Tablebases

Forum Posts

2009

• New open source engine called "Pawny" by Graham Banks, CCC, September 03, 2009
• Re: New open source engine called "Pawny" by Mincho Georgiev, CCC, September 04, 2009
• Pawny - new version (0.11) by Mincho Georgiev, CCC, September 15, 2009

2010 ...

• Pawny 0.15 is out by Mincho Georgiev, CCC, January 01, 2010
• Pawny 0.1.6 by Mincho Georgiev, CCC, February 13, 2010
• Pawny - Updated by Mincho Georgiev, CCC, March 02, 2010
• Pawny 0.2 by Mincho Georgiev, CCC, July 01, 2010
• Pawny 0.2.1 by Mincho Georgiev, CCC, February 01, 2011
• Pawny updated by Mincho Georgiev, CCC, November 24, 2011
• New Pawny by Gabor Szots, CCC, May 31, 2013

2015 ...

• Pawny 1.1 by Graham Banks, CCC, June 14, 2015
• Android Request by Mincho Georgiev, CCC, June 19, 2016

External Links

• Pawny's Homepage (Wayback Machine, September 08, 2009)
• Pawny's Homepage (Wayback Machine, August 05, 2019)

Pawny's Version History (Wayback Machine, July 19, 2019)

• Index of /chess/engines/Jim Ablett/PAWNY by Jim Ablett, hosted by Kirill Kryukov
• Mac Chess Engines Repository hosted by Julien Marcel
• Pawny in CCRL 40/15

References