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Created page with "'''Home * Engines * OBender''' FILE:Bogdana Hmelnitskogo Ave., Melitopol, Zaporizhia Oblast, 16.JPG|border|right|thumb| Monument of Ostap Bender <ref>Monu..."
'''[[Main Page|Home]] * [[Engines]] * OBender'''
[[FILE:Bogdana Hmelnitskogo Ave., Melitopol, Zaporizhia Oblast, 16.JPG|border|right|thumb| Monument of Ostap Bender <ref>Monument of Ostap Bender in [https://en.wikipedia.org/wiki/Melitopol Melitopol], [https://en.wikipedia.org/wiki/Ukraine Ukraine], Photo by [https://ru.wikipedia.org/wiki/%D0%A3%D1%87%D0%B0%D1%81%D1%82%D0%BD%D0%B8%D0%BA:Melitopol_rock_city Олег Довгаль], October 4, 2012, [https://creativecommons.org/licenses/by-sa/3.0/deed.en CC BY-SA 3.0], [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons], [https://ru.wikipedia.org/wiki/%D0%9E%D1%81%D1%82%D0%B0%D0%BF_%D0%91%D0%B5%D0%BD%D0%B4%D0%B5%D1%80 Остап Бендер — Википедия]</ref> ]]
'''OBender''', (previously called Qchess and Chess)<br/>
a [[Chess Engine Communication Protocol]] compliant [[:Category:Open Source|open source chess program]] by [[Evgeniy Korniloff]], written in [[C]],
with recent modifications by [[Serg Nifont]]. Sources of various versions are hosted by [[Jim Ablett]] <ref>[http://evgeniy-korniloff.narod.ru/ Домашняя страничка Евгения Корнилова | Evgeniy Korniloff Home Page]</ref> <ref>[http://kirr.homeunix.org/chess/engines/Jim%20Ablett/OBENDER/ Index of /chess/engines/Jim Ablett/OBENDER] by [[Jim Ablett]], hosted by [[Kirill Kryukov]]</ref>. Despite released more recently, OBender aka Qchess seems to be the oldest Russian [[:Category:WinBoard|WinBoard engine]]. QChess was a demonstration program of [[Selectivity|selective]] [[Search|search]] as an example in Evgeniy Korniloff's book ''Программирование шахмат и других логических игр'' (Programming Chess and other logical games) <ref>[[Evgeniy Korniloff]] ('''2005'''). ''Программирование шахмат и других логических игр''. (Programming Chess and other logical games), ISBN 5-94157-497-5, [http://static.ozone.ru/multimedia/book_file/1007127469.pdf Глава 1. Общие сведения (Chapter I) as pdf]</ref>. The program has an own [[GUI|graphical user interface]], but can also play via WinBoard. A newer version of the engine was called Chess, applying a deeper but narrower selective search with an extended positional [[Evaluation|evaluation]], until it evolved to OBender with an additional side branch called [[Woodpecker]] <ref>[http://www.sdchess.ru/OBender.htm OBender (ранее - Qchess-chess) by Evgeniy Korniloff, Russia] from [http://www.sdchess.ru/ sdchess.ru]</ref>.
=Description=
OBender [[Board Representation|represents the board]] with [[8x8 Board|8x8 arrays]] and [[Piece-Lists|piece-lists]], and applies [[Negamax|negamax]] [[Principal Variation Search|PVS]] with [[Null Move Pruning|null move pruning]], [[Mate Threat Extensions|mate threat extensions]], [[Check Extensions|check extensions]], [[Late Move Reductions|LMR]] and [[Quiescence Search|quiescence search]] inside the [[Iterative Deepening|iterative deepening]] framework.
Beside the [[Transposition Table|transposition table]] and a tree structure of [[Principal Variation|principal variations]], OBender features a [[Persistent Hash Table|persistent learn file]] and various personalities. [[Move Ordering|Move ordering]] is further enhanced by the [[Killer Heuristic|killer heuristic]] and [[History Heuristic|history heuristic]], and the [[Evaluation|evaluation]] takes [[Material|material]], [[Piece-Square Tables|piece squares]], [[Pawn Structure|pawn structure]], [[King Safety|king safety]], and [[Mobility|mobility]] into account, also considering [[Attacks|attacks]] and [[X-ray|x-ray]] attacks and [[Pin|pinned pieces]] <ref>Description based on OBender-3.2.x.s.7.5</ref>.
=Etymology=
OBender is named after the main character of the classic [https://en.wikipedia.org/wiki/Satire satirical novel] ''[https://en.wikipedia.org/wiki/The_Twelve_Chairs The Twelve Chairs]'' by the [https://en.wikipedia.org/wiki/Odessa Odessan] [https://en.wikipedia.org/wiki/Soviet_Union Soviet] authors [https://en.wikipedia.org/wiki/Ilf_and_Petrov Ilf and Petrov], released in 1928, and its 1931 sequel ''[https://en.wikipedia.org/wiki/The_Little_Golden_Calf The Little Golden Calf]''. “[https://en.wiktionary.org/wiki/smooth_operator Smooth operator]” and [https://en.wiktionary.org/wiki/conman conman] [https://en.wikipedia.org/wiki/Ostap_Bender Ostap Bender] is a tricky individual who makes people believe he's a chess grandmaster and makes a now very well-known speech about making a small town called Vasiuki very famous by engaging it into a series of chess matches against the whole world, and even against other planets <ref>[http://www.uschess.org/content/view/8881/475/ The United States Chess Federation - Ostap Bender and the Space Chess Game] by [https://en.wikipedia.org/wiki/Chess_Life Glenn Petersen], November 8, 2008 </ref> <ref>[http://www.chessgames.com/perl/chessplayer?pid=137965 The chess games of Ostap Bender] from [http://www.chessgames.com/index.html chessgames.com]</ref> <ref>[http://www.chess.com/blog/colibas/the-interplanetary-chess-congress The Interplanetary Chess Congress] by [http://www.chess.com/members/view/colibas colibas], [https://en.wikipedia.org/wiki/Chess.com Chess.com], August 17, 2012</ref>.
=See also=
* [[Ippolit]]
* [[QCHESS]]
* [[Woodpecker]]
=Forum Posts=
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=6526&p=3065 Problems with OBender] by [[Harm Geert Muller]], [[Computer Chess Forums|Winboard Forum]], May 30, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=17474 Highest number of programs?] by Tony Thomas, [[CCC]], October 30, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=23718 OBender 3.29a by Evgeniy Korniloff] by [[Norbert Raimund Leisner]], [[CCC]], September 14, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=28082 OBender by Evgeniy Korniloff (formely: QChess) as x64?] by [[Norbert Raimund Leisner]], [[CCC]], May 23, 2009
* [http://www.talkchess.com/forum/viewtopic.php?t=34787 Silent updates to Woodpecker and OBender] by [[Tony Mokonen]], [[CCC]], June 07, 2010
* [http://www.talkchess.com/forum/viewtopic.php?t=59876 Obender 03.2016 64-bit (working compile by Andrew Fan)] by [[Graham Banks]], [[CCC]], April 16, 2016
=External Links=
==Chess Engine==
* [http://evgeniy-korniloff.narod.ru/ Домашняя страничка Евгения Корнилова | Evgeniy Korniloff Home Page]
: [http://serg-nifont.narod.ru/obender.html Chess OBender Download Free] by [[Serg Nifont]]
* [http://kirr.homeunix.org/chess/engines/Jim%20Ablett/OBENDER/ Index of /chess/engines/Jim Ablett/OBENDER] by [[Jim Ablett]], hosted by [[Kirill Kryukov]]
* [http://www.sdchess.ru/OBender.htm OBender (ранее - Qchess-chess) by Evgeniy Korniloff, Russia] from [http://www.sdchess.ru/ sdchess.ru]
* [http://www.computerchess.org.uk/ccrl/4040/cgi/compare_engines.cgi?family=OBender&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 OBender] in [[CCRL|CCRL 40/15]]
==Misc==
* [https://en.wikipedia.org/wiki/Ostap_Bender Ostap Bender from Wikipedia]
* [https://en.wikipedia.org/wiki/The_Twelve_Chairs The Twelve Chairs from Wikipedia]
* [http://www.chessgames.com/perl/chessplayer?pid=137965 The chess games of Ostap Bender] from [http://www.chessgames.com/index.html chessgames.com]
* Шахматы в фильме "12 стульев", Chess in the movie from the 1976 USSR series [https://en.wikipedia.org/wiki/The_Twelve_Chairs_%281976_film%29 The Twelve Chairs] with [https://en.wikipedia.org/wiki/Andrei_Mironov_%28actor%29 Andrei Mironov] as [https://en.wikipedia.org/wiki/Ostap_Bender Ostap Bender], [https://en.wikipedia.org/wiki/YouTube YouTube] Video
: {{#evu:https://www.youtube.com/watch?v=USOvxS9RKa8|alignment=left|valignment=top}}
=References=
<references />
'''[[Engines|Up one level]]'''
[[Category:Open Source]]
[[Category:WinBoard]]
[[Category:XBoard]]
[[Category:X86]]
[[Category:X64]]
[[Category:PC]]
[[Category:Windows]]
[[Category:Linux]]
[[Category:Fiction]]
[[Category:Film]]
[[FILE:Bogdana Hmelnitskogo Ave., Melitopol, Zaporizhia Oblast, 16.JPG|border|right|thumb| Monument of Ostap Bender <ref>Monument of Ostap Bender in [https://en.wikipedia.org/wiki/Melitopol Melitopol], [https://en.wikipedia.org/wiki/Ukraine Ukraine], Photo by [https://ru.wikipedia.org/wiki/%D0%A3%D1%87%D0%B0%D1%81%D1%82%D0%BD%D0%B8%D0%BA:Melitopol_rock_city Олег Довгаль], October 4, 2012, [https://creativecommons.org/licenses/by-sa/3.0/deed.en CC BY-SA 3.0], [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons], [https://ru.wikipedia.org/wiki/%D0%9E%D1%81%D1%82%D0%B0%D0%BF_%D0%91%D0%B5%D0%BD%D0%B4%D0%B5%D1%80 Остап Бендер — Википедия]</ref> ]]
'''OBender''', (previously called Qchess and Chess)<br/>
a [[Chess Engine Communication Protocol]] compliant [[:Category:Open Source|open source chess program]] by [[Evgeniy Korniloff]], written in [[C]],
with recent modifications by [[Serg Nifont]]. Sources of various versions are hosted by [[Jim Ablett]] <ref>[http://evgeniy-korniloff.narod.ru/ Домашняя страничка Евгения Корнилова | Evgeniy Korniloff Home Page]</ref> <ref>[http://kirr.homeunix.org/chess/engines/Jim%20Ablett/OBENDER/ Index of /chess/engines/Jim Ablett/OBENDER] by [[Jim Ablett]], hosted by [[Kirill Kryukov]]</ref>. Despite released more recently, OBender aka Qchess seems to be the oldest Russian [[:Category:WinBoard|WinBoard engine]]. QChess was a demonstration program of [[Selectivity|selective]] [[Search|search]] as an example in Evgeniy Korniloff's book ''Программирование шахмат и других логических игр'' (Programming Chess and other logical games) <ref>[[Evgeniy Korniloff]] ('''2005'''). ''Программирование шахмат и других логических игр''. (Programming Chess and other logical games), ISBN 5-94157-497-5, [http://static.ozone.ru/multimedia/book_file/1007127469.pdf Глава 1. Общие сведения (Chapter I) as pdf]</ref>. The program has an own [[GUI|graphical user interface]], but can also play via WinBoard. A newer version of the engine was called Chess, applying a deeper but narrower selective search with an extended positional [[Evaluation|evaluation]], until it evolved to OBender with an additional side branch called [[Woodpecker]] <ref>[http://www.sdchess.ru/OBender.htm OBender (ранее - Qchess-chess) by Evgeniy Korniloff, Russia] from [http://www.sdchess.ru/ sdchess.ru]</ref>.
=Description=
OBender [[Board Representation|represents the board]] with [[8x8 Board|8x8 arrays]] and [[Piece-Lists|piece-lists]], and applies [[Negamax|negamax]] [[Principal Variation Search|PVS]] with [[Null Move Pruning|null move pruning]], [[Mate Threat Extensions|mate threat extensions]], [[Check Extensions|check extensions]], [[Late Move Reductions|LMR]] and [[Quiescence Search|quiescence search]] inside the [[Iterative Deepening|iterative deepening]] framework.
Beside the [[Transposition Table|transposition table]] and a tree structure of [[Principal Variation|principal variations]], OBender features a [[Persistent Hash Table|persistent learn file]] and various personalities. [[Move Ordering|Move ordering]] is further enhanced by the [[Killer Heuristic|killer heuristic]] and [[History Heuristic|history heuristic]], and the [[Evaluation|evaluation]] takes [[Material|material]], [[Piece-Square Tables|piece squares]], [[Pawn Structure|pawn structure]], [[King Safety|king safety]], and [[Mobility|mobility]] into account, also considering [[Attacks|attacks]] and [[X-ray|x-ray]] attacks and [[Pin|pinned pieces]] <ref>Description based on OBender-3.2.x.s.7.5</ref>.
=Etymology=
OBender is named after the main character of the classic [https://en.wikipedia.org/wiki/Satire satirical novel] ''[https://en.wikipedia.org/wiki/The_Twelve_Chairs The Twelve Chairs]'' by the [https://en.wikipedia.org/wiki/Odessa Odessan] [https://en.wikipedia.org/wiki/Soviet_Union Soviet] authors [https://en.wikipedia.org/wiki/Ilf_and_Petrov Ilf and Petrov], released in 1928, and its 1931 sequel ''[https://en.wikipedia.org/wiki/The_Little_Golden_Calf The Little Golden Calf]''. “[https://en.wiktionary.org/wiki/smooth_operator Smooth operator]” and [https://en.wiktionary.org/wiki/conman conman] [https://en.wikipedia.org/wiki/Ostap_Bender Ostap Bender] is a tricky individual who makes people believe he's a chess grandmaster and makes a now very well-known speech about making a small town called Vasiuki very famous by engaging it into a series of chess matches against the whole world, and even against other planets <ref>[http://www.uschess.org/content/view/8881/475/ The United States Chess Federation - Ostap Bender and the Space Chess Game] by [https://en.wikipedia.org/wiki/Chess_Life Glenn Petersen], November 8, 2008 </ref> <ref>[http://www.chessgames.com/perl/chessplayer?pid=137965 The chess games of Ostap Bender] from [http://www.chessgames.com/index.html chessgames.com]</ref> <ref>[http://www.chess.com/blog/colibas/the-interplanetary-chess-congress The Interplanetary Chess Congress] by [http://www.chess.com/members/view/colibas colibas], [https://en.wikipedia.org/wiki/Chess.com Chess.com], August 17, 2012</ref>.
=See also=
* [[Ippolit]]
* [[QCHESS]]
* [[Woodpecker]]
=Forum Posts=
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=6526&p=3065 Problems with OBender] by [[Harm Geert Muller]], [[Computer Chess Forums|Winboard Forum]], May 30, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=17474 Highest number of programs?] by Tony Thomas, [[CCC]], October 30, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=23718 OBender 3.29a by Evgeniy Korniloff] by [[Norbert Raimund Leisner]], [[CCC]], September 14, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=28082 OBender by Evgeniy Korniloff (formely: QChess) as x64?] by [[Norbert Raimund Leisner]], [[CCC]], May 23, 2009
* [http://www.talkchess.com/forum/viewtopic.php?t=34787 Silent updates to Woodpecker and OBender] by [[Tony Mokonen]], [[CCC]], June 07, 2010
* [http://www.talkchess.com/forum/viewtopic.php?t=59876 Obender 03.2016 64-bit (working compile by Andrew Fan)] by [[Graham Banks]], [[CCC]], April 16, 2016
=External Links=
==Chess Engine==
* [http://evgeniy-korniloff.narod.ru/ Домашняя страничка Евгения Корнилова | Evgeniy Korniloff Home Page]
: [http://serg-nifont.narod.ru/obender.html Chess OBender Download Free] by [[Serg Nifont]]
* [http://kirr.homeunix.org/chess/engines/Jim%20Ablett/OBENDER/ Index of /chess/engines/Jim Ablett/OBENDER] by [[Jim Ablett]], hosted by [[Kirill Kryukov]]
* [http://www.sdchess.ru/OBender.htm OBender (ранее - Qchess-chess) by Evgeniy Korniloff, Russia] from [http://www.sdchess.ru/ sdchess.ru]
* [http://www.computerchess.org.uk/ccrl/4040/cgi/compare_engines.cgi?family=OBender&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 OBender] in [[CCRL|CCRL 40/15]]
==Misc==
* [https://en.wikipedia.org/wiki/Ostap_Bender Ostap Bender from Wikipedia]
* [https://en.wikipedia.org/wiki/The_Twelve_Chairs The Twelve Chairs from Wikipedia]
* [http://www.chessgames.com/perl/chessplayer?pid=137965 The chess games of Ostap Bender] from [http://www.chessgames.com/index.html chessgames.com]
* Шахматы в фильме "12 стульев", Chess in the movie from the 1976 USSR series [https://en.wikipedia.org/wiki/The_Twelve_Chairs_%281976_film%29 The Twelve Chairs] with [https://en.wikipedia.org/wiki/Andrei_Mironov_%28actor%29 Andrei Mironov] as [https://en.wikipedia.org/wiki/Ostap_Bender Ostap Bender], [https://en.wikipedia.org/wiki/YouTube YouTube] Video
: {{#evu:https://www.youtube.com/watch?v=USOvxS9RKa8|alignment=left|valignment=top}}
=References=
<references />
'''[[Engines|Up one level]]'''
[[Category:Open Source]]
[[Category:WinBoard]]
[[Category:XBoard]]
[[Category:X86]]
[[Category:X64]]
[[Category:PC]]
[[Category:Windows]]
[[Category:Linux]]
[[Category:Fiction]]
[[Category:Film]]
