Twisted Logic

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Twisted Logic, an UCI compliant chess engine written by Edsel Apostol in C. Twisted Logic was first released in August 2005 and over time increased in strength from about 1600 to 2650 RUEL. An early 2007 version is available as open source licensed under the GNU GPL. It is a clearly written didactic bitboard engine, with rudimentary search and evaluation, and was base of later Twisted Logic versions as well for Hannibal.

=Tournament Play= Twisted Logic played the WCRCC 2008 and WCRCC 2009, as well the CCT10 and CCT11, and over the board the Italian CCC 2009.

=Features=

Board Representation

 * Bitboards
 * Kindergarten Bitboards

Search

 * Iterative Deepening
 * Principal Variation Search
 * Quiescence Search
 * Mate Distance Pruning

Evaluation

 * Material
 * Piece-Square Tables
 * Tapered Eval

=See also=
 * Combinatorial Logic
 * Sequential Logic
 * Hannibal
 * Invictus

=Forum Posts=

2005

 * Twisted Logic Chess Engine v0.001 released! by Edsel Apostol, Winboard Forum, August 11, 2005
 * Twisted Logic Chess Engine 0.016 released! by Edsel Apostol, Winboard Forum, November 10, 2005

2006

 * Twisted Logic 037o released!!! by Edsel Apostol, Winboard Forum, April 26, 2006
 * Twisted Logic 0.037z1 released!!! by Edsel Apostol, Winboard Forum, May 08, 2006
 * Twisted Logic 0.057e3 released! by Edsel Apostol, Winboard Forum, July 11, 2006
 * Twisted Logic 0.065e35 and 0.065e37 released! by Edsel Apostol, Winboard Forum, August 31, 2006

2007

 * Twisted Logic 0.085 released!] by Edsel Apostol, Winboard Forum, March 18, 2007
 * Twisted Logic 0.099x released!!! by Edsel Apostol, Winboard Forum, May 08, 2007
 * Twisted Logic 20070602 released!!! by Edsel Apostol, Winboard Forum, June 03, 2007
 * Twisted Logic 20070706 released!!! by Edsel Apostol, Winboard Forum, July 06, 2007

2008 ...

 * Twisted Logic 20080404x is available! by Edsel Apostol, Winboard Forum, April 04, 2008
 * Twisted Logic 20080620! by Edsel Apostol, Winboard Forum, June 21, 2008

2010 ...

 * Twisted Logic 20100131x by Edsel Apostol, CCC, February 02, 2010

=External Links=

Chess Engine

 * Early version of Twisted Logic chess engine from 2007
 * Twisted Logic in CCRL 40/40

Misc

 * twisted - Wiktionary
 * Twisted from Wikipedia
 * logic - Wiktionary
 * Logic from Wikipedia
 * Logic (disambiguation) from Wikipedia
 * Outline of logic from Wikipedia
 * Mathematical logic from Wikipedia]
 * Philosophical logic from Wikipedia
 * Logical form from Wikipedia
 * Coldplay - Twisted Logic (2005), YouTube Video

=References= Up one Level