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'''[[Main Page|Home]] * [[Engines]] * Twisted Logic'''
[[FILE:Paolo - Logica, 1546 - 4629053.tif|border|right|thumb| Logica, 1546 <ref>[https://en.wikipedia.org/wiki/Paul_of_Venice Paul of Venice] ('''1546'''). ''Logica''. Bartolomeo e Francesco Imperatore, Typographic brand on the title page </ref> ]]
'''Twisted Logic''',<br/>
an [[UCI]] compliant chess engine written by [[Edsel Apostol]] in [[C]]. Twisted Logic was first released in August 2005 <ref>[http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=3270&p=16194 Twisted Logic Chess Engine v0.001 released!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], August 11, 2005</ref> and over time increased in strength from about 1600 to 2650 [[UEL|RUEL]].
An early 2007 version is available as [[:Category:Open Source|open source]] licensed under the [[Free Software Foundation#GPL|GNU GPL]] <ref> [https://github.com/ed-apostol/TwistedLogic Early version of Twisted Logic chess engine from 2007]</ref>.
It is a clearly written didactic [[Bitboards|bitboard]] engine, with rudimentary [[Search|search]] and [[Evaluation|evaluation]], and was base of later Twisted Logic versions as well for [[Hannibal]].
=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==
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=3270&p=16194 Twisted Logic Chess Engine v0.001 released!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], August 11, 2005
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=3809&p=19362 Twisted Logic Chess Engine 0.016 released!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], November 10, 2005
==2006==
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=4706&p=24352 Twisted Logic 037o released!!!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], April 26, 2006
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=4766&p=24603 Twisted Logic 0.037z1 released!!!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], May 08, 2006
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=5185&p=26101 Twisted Logic 0.057e3 released!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], July 11, 2006
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=5510&p=27174 Twisted Logic 0.065e35 and 0.065e37 released!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], August 31, 2006
==2007==
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=6323&p=30018 Twisted Logic 0.085 released!]] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], March 18, 2007
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=6459&p=30447 Twisted Logic 0.099x released!!!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], May 08, 2007
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=6535&p=30676 Twisted Logic 20070602 released!!!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], June 03, 2007
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=6633&p=30983 Twisted Logic 20070706 released!!!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], July 06, 2007
==2008 ...==
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=7258&p=33071 Twisted Logic 20080404x is available!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], April 04, 2008
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=49281&p=185865 Twisted Logic 20080620!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], June 21, 2008
==2010 ...==
* [http://www.talkchess.com/forum/viewtopic.php?t=32288 Twisted Logic 20100131x] by [[Edsel Apostol]], [[CCC]], February 02, 2010
=External Links=
==Chess Engine==
* [https://github.com/ed-apostol/TwistedLogic Early version of Twisted Logic chess engine from 2007]
* [http://www.computerchess.org.uk/ccrl/4040/cgi/compare_engines.cgi?family=Twisted%20Logic&print=Rating+list&print=Results+table&print=LOS+table&print=Ponder+hit+table&print=Eval+difference+table&print=Comopp+gamenum+table&print=Overlap+table&print=Score+with+common+opponents Twisted Logic] in [[CCRL|CCRL 40/40]]
==Misc==
* [https://en.wiktionary.org/wiki/twisted twisted - Wiktionary]
* [https://en.wikipedia.org/wiki/Twisted Twisted from Wikipedia]
* [https://en.wiktionary.org/wiki/logic logic - Wiktionary]
* [https://en.wikipedia.org/wiki/Logic Logic from Wikipedia]
* [https://en.wikipedia.org/wiki/Logic_(disambiguation) Logic (disambiguation) from Wikipedia]
* [https://en.wikipedia.org/wiki/Outline_of_logic Outline of logic from Wikipedia]
* [https://en.wikipedia.org/wiki/Mathematical_logic Mathematical logic] from Wikipedia]
* [https://en.wikipedia.org/wiki/Philosophical_logic Philosophical logic from Wikipedia]
* [https://en.wikipedia.org/wiki/Logical_form Logical form from Wikipedia]
=References=
<references />
'''[[Engines|Up one Level]]'''
[[Category:UCI]]
[[Category:Open Source]]
[[Category:GPL]]
[[FILE:Paolo - Logica, 1546 - 4629053.tif|border|right|thumb| Logica, 1546 <ref>[https://en.wikipedia.org/wiki/Paul_of_Venice Paul of Venice] ('''1546'''). ''Logica''. Bartolomeo e Francesco Imperatore, Typographic brand on the title page </ref> ]]
'''Twisted Logic''',<br/>
an [[UCI]] compliant chess engine written by [[Edsel Apostol]] in [[C]]. Twisted Logic was first released in August 2005 <ref>[http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=3270&p=16194 Twisted Logic Chess Engine v0.001 released!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], August 11, 2005</ref> and over time increased in strength from about 1600 to 2650 [[UEL|RUEL]].
An early 2007 version is available as [[:Category:Open Source|open source]] licensed under the [[Free Software Foundation#GPL|GNU GPL]] <ref> [https://github.com/ed-apostol/TwistedLogic Early version of Twisted Logic chess engine from 2007]</ref>.
It is a clearly written didactic [[Bitboards|bitboard]] engine, with rudimentary [[Search|search]] and [[Evaluation|evaluation]], and was base of later Twisted Logic versions as well for [[Hannibal]].
=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==
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=3270&p=16194 Twisted Logic Chess Engine v0.001 released!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], August 11, 2005
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=3809&p=19362 Twisted Logic Chess Engine 0.016 released!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], November 10, 2005
==2006==
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=4706&p=24352 Twisted Logic 037o released!!!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], April 26, 2006
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=4766&p=24603 Twisted Logic 0.037z1 released!!!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], May 08, 2006
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=5185&p=26101 Twisted Logic 0.057e3 released!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], July 11, 2006
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=5510&p=27174 Twisted Logic 0.065e35 and 0.065e37 released!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], August 31, 2006
==2007==
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=6323&p=30018 Twisted Logic 0.085 released!]] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], March 18, 2007
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=6459&p=30447 Twisted Logic 0.099x released!!!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], May 08, 2007
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=6535&p=30676 Twisted Logic 20070602 released!!!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], June 03, 2007
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=6633&p=30983 Twisted Logic 20070706 released!!!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], July 06, 2007
==2008 ...==
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=7258&p=33071 Twisted Logic 20080404x is available!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], April 04, 2008
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=49281&p=185865 Twisted Logic 20080620!] by [[Edsel Apostol]], [[Computer Chess Forums|Winboard Forum]], June 21, 2008
==2010 ...==
* [http://www.talkchess.com/forum/viewtopic.php?t=32288 Twisted Logic 20100131x] by [[Edsel Apostol]], [[CCC]], February 02, 2010
=External Links=
==Chess Engine==
* [https://github.com/ed-apostol/TwistedLogic Early version of Twisted Logic chess engine from 2007]
* [http://www.computerchess.org.uk/ccrl/4040/cgi/compare_engines.cgi?family=Twisted%20Logic&print=Rating+list&print=Results+table&print=LOS+table&print=Ponder+hit+table&print=Eval+difference+table&print=Comopp+gamenum+table&print=Overlap+table&print=Score+with+common+opponents Twisted Logic] in [[CCRL|CCRL 40/40]]
==Misc==
* [https://en.wiktionary.org/wiki/twisted twisted - Wiktionary]
* [https://en.wikipedia.org/wiki/Twisted Twisted from Wikipedia]
* [https://en.wiktionary.org/wiki/logic logic - Wiktionary]
* [https://en.wikipedia.org/wiki/Logic Logic from Wikipedia]
* [https://en.wikipedia.org/wiki/Logic_(disambiguation) Logic (disambiguation) from Wikipedia]
* [https://en.wikipedia.org/wiki/Outline_of_logic Outline of logic from Wikipedia]
* [https://en.wikipedia.org/wiki/Mathematical_logic Mathematical logic] from Wikipedia]
* [https://en.wikipedia.org/wiki/Philosophical_logic Philosophical logic from Wikipedia]
* [https://en.wikipedia.org/wiki/Logical_form Logical form from Wikipedia]
=References=
<references />
'''[[Engines|Up one Level]]'''
[[Category:UCI]]
[[Category:Open Source]]
[[Category:GPL]]
