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Created page with "'''Home * Engines * Sharper''' FILE:Pęczarski Card-sharpers.jpg|border|right|thumb| Card-Sharpers <ref>[https://commons.wikimedia.org/wiki/File:P%C4%99cz..."
'''[[Main Page|Home]] * [[Engines]] * Sharper'''
[[FILE:Pęczarski Card-sharpers.jpg|border|right|thumb| Card-Sharpers <ref>[https://commons.wikimedia.org/wiki/File:P%C4%99czarski_Card-sharpers.jpg Card-sharpers by candlelight] by [[:Category:Feliks Pęczarski|Feliks Pęczarski]], [https://en.wikipedia.org/wiki/Oil_painting oil on canvas], 1845, Current location: [https://en.wikipedia.org/wiki/National_Museum,_Warsaw National Museum, Warsaw], [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons], [https://en.wikipedia.org/wiki/Card_sharp Card sharp from Wikipedia]</ref> ]]
'''Sharper''',<br/>
a [[Chess Engine Communication Protocol]] aka [[WinBoard]] compliant chess engine by [[Albert Bertilsson]], written in [[Cpp|C++]]. Sharper emerged in 2002 and 2003 from Albert's former engine [[Sharp Chess|#Chess]], which was written in [[C sharp|C#]] <ref>[https://web.archive.org/web/20070607093301/http://www.albert.nu/default.asp?sub=programs/default.asp?sub=sharpchess/main.htm #Chess] ([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])</ref>. Released in 2003 <ref>[http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=41637 New engine, Sharper 0.02!] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], March 09, 2003</ref>, Sharper became a reference engine for [[Perft]] and [[Perft#Divide|Divide]] [[Perft Results|results]].
=Features=
<ref>Features based on [https://web.archive.org/web/20061014115710/http://www.albert.nu/default.asp?sub=programs/default.asp%3Fsub=sharper/main.htm History.txt], November 2003</ref>
==[[Board Representation]]==
* [[0x88]]
* [[Piece-Lists]]
* [[Bitboards]]
==[[Search]]==
* [[Iterative Deepening]]
* [[Aspiration Windows]]
* [[Alpha-Beta]]
* [[Transposition Table]]
* [[Zobrist Hashing]]
* [[Quiescence Search]]
* [[Null Move Pruning#ZugzwangVerification|Verified Null Move Pruning]]
* [[Extensions#FractionalExtensions|Fractional Extensions]]
** [[Check Extensions]]
** [[One Reply Extensions]]
** [[Passed Pawn Extensions|Pawns to 7th Rank]]
** [[Promotions]]
* [[Move Ordering]]
** [[MVV-LVA|MVV/LVA]]
** [[History Heuristic]]
** [[Piece-Square Tables]]
==[[Evaluation]]==
* [[Material]]
* [[Bishop Pair]]
* [[Piece-Square Tables]] <ref>[https://www.stmintz.com/ccc/index.php?id=304684 Program settings (Re: Programmers Should Take A Cue From Chessmaster)] by [[Albert Bertilsson]], [[CCC]], July 04, 2003</ref>
* [[King Safety]]
* [[Pawn Structure]]
* [[Pawn Hash Table]]
==Misc==
* [[Opening Book]]
* [[Perft]] and [[Perft#Divide|Divide]]
* [[Pondering]]
=See also=
* [[Sharp Chess|#Chess]]
* [[SharpChess]] by [[Peter Hughes]]
=Forum Posts=
==2003==
===February ...===
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=41257 To Uri, about perft speeds] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], February 14, 2003 » [[Perft]]
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=41284 Perft 9, confirmed by Sharper too...] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], February 16, 2003
* [https://www.stmintz.com/ccc/index.php?id=286582 Why have a UnMakeMove or UndoMove function (not as stupid as it sounds)?] by [[Albert Bertilsson]], [[CCC]], February 24, 2003 » [[Unmake Move]]
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=41637 New engine, Sharper 0.02!] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], March 09, 2003
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=41698 Sharper version 0.03 released!] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], March 12, 2003
* [https://www.stmintz.com/ccc/index.php?id=289154 Adding knowledge to the evaluation, what am I doing wrong?] by [[Albert Bertilsson]], [[CCC]], March 13, 2003
* [https://www.stmintz.com/ccc/index.php?id=289619 WACNEW 40% less fails when Sharper get 12x the time] by [[Albert Bertilsson]], [[CCC]], March 17, 2003 » [[Win at Chess]]
* [https://www.stmintz.com/ccc/index.php?id=289795 What's best low BF or good WAC result?] by [[Albert Bertilsson]], [[CCC]], March 18, 2003 » [[Branching Factor]]
* [https://www.stmintz.com/ccc/index.php?id=290060 Buggy check extensions, back to square one =(.] by [[Albert Bertilsson]], [[CCC]], March 20, 2003 » [[Check Extensions]]
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=41903 Sharper 0.04 released] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], March 22, 2003
* [https://www.stmintz.com/ccc/index.php?id=290806 I search for an opening book for my engine...] by [[Albert Bertilsson]], [[CCC]], March 26, 2003
===April ...===
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=42062 Sharper 0.06 released!] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], April 04, 2003
* [https://www.stmintz.com/ccc/index.php?id=294592 My engine doesn't understand this position neither do I] by [[Albert Bertilsson]], [[CCC]], April 25, 2003
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=42395 Sharper 0.07] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], April 26, 2003
* [https://www.stmintz.com/ccc/index.php?id=297640 Dual processor owners, please help me with 15 min of CPU time] by [[Albert Bertilsson]], [[CCC]], May 23, 2003
===June ...===
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=43139 Sharper 0.10 released] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], June 25, 2003
* [https://www.stmintz.com/ccc/index.php?id=303131 Problem with extending to maxdepth] by [[Albert Bertilsson]], [[CCC]], June 26, 2003 » [[Extensions]]
* [https://www.stmintz.com/ccc/index.php?id=303316 Improvements in BF makes my MoveGen suck =(] by [[Albert Bertilsson]], [[CCC]], June 26, 2003 » [[Branching Factor]], [[Move Generation]]
* [https://www.stmintz.com/ccc/index.php?id=304684 Program settings (Re: Programmers Should Take A Cue From Chessmaster)] by [[Albert Bertilsson]], [[CCC]], July 04, 2003 » [[Piece-Square Tables]]
* [https://www.stmintz.com/ccc/index.php?id=307781 How stable is stable enough for you?] by [[Albert Bertilsson]], [[CCC]], July 24, 2003
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=43541 Sharper 0.11 released] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], July 27, 2003
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=43614 Sharper 0.12 released] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], July 31, 2003
===August ...===
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=43645 Sharper 0.14 released!] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], August 03, 2003
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=44724 Sharper version 0.16 released] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], October 22, 2003
* [https://www.stmintz.com/ccc/index.php?id=326134 Highest perft for initial position?] by [[Albert Bertilsson]], [[CCC]], November 07, 2003 » [[Perft]]
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=45278 Anybody interested in a new version of Sharper?] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], November 24, 2003
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=45331 Sharper 0.17 released] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], November 27, 2003
* [https://www.stmintz.com/ccc/index.php?id=336810 A few Sharper pertfhash 8 benchmarks] by [[Frederic Louguet]], [[CCC]], December 18, 2003
==2004==
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=46015 Newer version of Sharper is available] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], January 11, 2004
* [https://www.stmintz.com/ccc/index.php?id=359113 Improving the endgame of my engine] by [[Albert Bertilsson]], [[CCC]], April 08, 2004 » [[Endgame]]
==2010 ...==
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=4&t=52965 perft/divide bug in roce38 and Sharper? [SOLVED]] by thedrunkard, [[Computer Chess Forums|Winboard Forum]], October 16, 2013 » [[Perft]], [[ROCE]]
=External Links=
==Chess Engine==
* [https://web.archive.org/web/20061014115710/http://www.albert.nu/default.asp?sub=programs/default.asp%3Fsub=sharper/main.htm Sharper] ([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])
* [http://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?print=Details&eng=Sharper%200.17#Sharper_0_17 Sharper 0.17] in [[CCRL|CCRL 40/4]]
==Misc==
* [https://en.wikipedia.org/wiki/Sharper Sharper from Wikipedia]
* [https://en.wiktionary.org/wiki/sharper sharper - Wiktionary]
* [https://en.wikipedia.org/wiki/Sharp Sharp from Wikipedia]
=References=
<references />
'''[[Engines|Up one level]]'''
[[Category:WinBoard]]
[[Category:Feliks Pęczarski]]
[[FILE:Pęczarski Card-sharpers.jpg|border|right|thumb| Card-Sharpers <ref>[https://commons.wikimedia.org/wiki/File:P%C4%99czarski_Card-sharpers.jpg Card-sharpers by candlelight] by [[:Category:Feliks Pęczarski|Feliks Pęczarski]], [https://en.wikipedia.org/wiki/Oil_painting oil on canvas], 1845, Current location: [https://en.wikipedia.org/wiki/National_Museum,_Warsaw National Museum, Warsaw], [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons], [https://en.wikipedia.org/wiki/Card_sharp Card sharp from Wikipedia]</ref> ]]
'''Sharper''',<br/>
a [[Chess Engine Communication Protocol]] aka [[WinBoard]] compliant chess engine by [[Albert Bertilsson]], written in [[Cpp|C++]]. Sharper emerged in 2002 and 2003 from Albert's former engine [[Sharp Chess|#Chess]], which was written in [[C sharp|C#]] <ref>[https://web.archive.org/web/20070607093301/http://www.albert.nu/default.asp?sub=programs/default.asp?sub=sharpchess/main.htm #Chess] ([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])</ref>. Released in 2003 <ref>[http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=41637 New engine, Sharper 0.02!] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], March 09, 2003</ref>, Sharper became a reference engine for [[Perft]] and [[Perft#Divide|Divide]] [[Perft Results|results]].
=Features=
<ref>Features based on [https://web.archive.org/web/20061014115710/http://www.albert.nu/default.asp?sub=programs/default.asp%3Fsub=sharper/main.htm History.txt], November 2003</ref>
==[[Board Representation]]==
* [[0x88]]
* [[Piece-Lists]]
* [[Bitboards]]
==[[Search]]==
* [[Iterative Deepening]]
* [[Aspiration Windows]]
* [[Alpha-Beta]]
* [[Transposition Table]]
* [[Zobrist Hashing]]
* [[Quiescence Search]]
* [[Null Move Pruning#ZugzwangVerification|Verified Null Move Pruning]]
* [[Extensions#FractionalExtensions|Fractional Extensions]]
** [[Check Extensions]]
** [[One Reply Extensions]]
** [[Passed Pawn Extensions|Pawns to 7th Rank]]
** [[Promotions]]
* [[Move Ordering]]
** [[MVV-LVA|MVV/LVA]]
** [[History Heuristic]]
** [[Piece-Square Tables]]
==[[Evaluation]]==
* [[Material]]
* [[Bishop Pair]]
* [[Piece-Square Tables]] <ref>[https://www.stmintz.com/ccc/index.php?id=304684 Program settings (Re: Programmers Should Take A Cue From Chessmaster)] by [[Albert Bertilsson]], [[CCC]], July 04, 2003</ref>
* [[King Safety]]
* [[Pawn Structure]]
* [[Pawn Hash Table]]
==Misc==
* [[Opening Book]]
* [[Perft]] and [[Perft#Divide|Divide]]
* [[Pondering]]
=See also=
* [[Sharp Chess|#Chess]]
* [[SharpChess]] by [[Peter Hughes]]
=Forum Posts=
==2003==
===February ...===
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=41257 To Uri, about perft speeds] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], February 14, 2003 » [[Perft]]
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=41284 Perft 9, confirmed by Sharper too...] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], February 16, 2003
* [https://www.stmintz.com/ccc/index.php?id=286582 Why have a UnMakeMove or UndoMove function (not as stupid as it sounds)?] by [[Albert Bertilsson]], [[CCC]], February 24, 2003 » [[Unmake Move]]
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=41637 New engine, Sharper 0.02!] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], March 09, 2003
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=41698 Sharper version 0.03 released!] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], March 12, 2003
* [https://www.stmintz.com/ccc/index.php?id=289154 Adding knowledge to the evaluation, what am I doing wrong?] by [[Albert Bertilsson]], [[CCC]], March 13, 2003
* [https://www.stmintz.com/ccc/index.php?id=289619 WACNEW 40% less fails when Sharper get 12x the time] by [[Albert Bertilsson]], [[CCC]], March 17, 2003 » [[Win at Chess]]
* [https://www.stmintz.com/ccc/index.php?id=289795 What's best low BF or good WAC result?] by [[Albert Bertilsson]], [[CCC]], March 18, 2003 » [[Branching Factor]]
* [https://www.stmintz.com/ccc/index.php?id=290060 Buggy check extensions, back to square one =(.] by [[Albert Bertilsson]], [[CCC]], March 20, 2003 » [[Check Extensions]]
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=41903 Sharper 0.04 released] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], March 22, 2003
* [https://www.stmintz.com/ccc/index.php?id=290806 I search for an opening book for my engine...] by [[Albert Bertilsson]], [[CCC]], March 26, 2003
===April ...===
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=42062 Sharper 0.06 released!] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], April 04, 2003
* [https://www.stmintz.com/ccc/index.php?id=294592 My engine doesn't understand this position neither do I] by [[Albert Bertilsson]], [[CCC]], April 25, 2003
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=42395 Sharper 0.07] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], April 26, 2003
* [https://www.stmintz.com/ccc/index.php?id=297640 Dual processor owners, please help me with 15 min of CPU time] by [[Albert Bertilsson]], [[CCC]], May 23, 2003
===June ...===
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=43139 Sharper 0.10 released] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], June 25, 2003
* [https://www.stmintz.com/ccc/index.php?id=303131 Problem with extending to maxdepth] by [[Albert Bertilsson]], [[CCC]], June 26, 2003 » [[Extensions]]
* [https://www.stmintz.com/ccc/index.php?id=303316 Improvements in BF makes my MoveGen suck =(] by [[Albert Bertilsson]], [[CCC]], June 26, 2003 » [[Branching Factor]], [[Move Generation]]
* [https://www.stmintz.com/ccc/index.php?id=304684 Program settings (Re: Programmers Should Take A Cue From Chessmaster)] by [[Albert Bertilsson]], [[CCC]], July 04, 2003 » [[Piece-Square Tables]]
* [https://www.stmintz.com/ccc/index.php?id=307781 How stable is stable enough for you?] by [[Albert Bertilsson]], [[CCC]], July 24, 2003
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=43541 Sharper 0.11 released] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], July 27, 2003
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=43614 Sharper 0.12 released] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], July 31, 2003
===August ...===
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=43645 Sharper 0.14 released!] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], August 03, 2003
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=44724 Sharper version 0.16 released] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], October 22, 2003
* [https://www.stmintz.com/ccc/index.php?id=326134 Highest perft for initial position?] by [[Albert Bertilsson]], [[CCC]], November 07, 2003 » [[Perft]]
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=45278 Anybody interested in a new version of Sharper?] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], November 24, 2003
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=45331 Sharper 0.17 released] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], November 27, 2003
* [https://www.stmintz.com/ccc/index.php?id=336810 A few Sharper pertfhash 8 benchmarks] by [[Frederic Louguet]], [[CCC]], December 18, 2003
==2004==
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=46015 Newer version of Sharper is available] by [[Albert Bertilsson]], [[Computer Chess Forums|Winboard Forum]], January 11, 2004
* [https://www.stmintz.com/ccc/index.php?id=359113 Improving the endgame of my engine] by [[Albert Bertilsson]], [[CCC]], April 08, 2004 » [[Endgame]]
==2010 ...==
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=4&t=52965 perft/divide bug in roce38 and Sharper? [SOLVED]] by thedrunkard, [[Computer Chess Forums|Winboard Forum]], October 16, 2013 » [[Perft]], [[ROCE]]
=External Links=
==Chess Engine==
* [https://web.archive.org/web/20061014115710/http://www.albert.nu/default.asp?sub=programs/default.asp%3Fsub=sharper/main.htm Sharper] ([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])
* [http://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?print=Details&eng=Sharper%200.17#Sharper_0_17 Sharper 0.17] in [[CCRL|CCRL 40/4]]
==Misc==
* [https://en.wikipedia.org/wiki/Sharper Sharper from Wikipedia]
* [https://en.wiktionary.org/wiki/sharper sharper - Wiktionary]
* [https://en.wikipedia.org/wiki/Sharp Sharp from Wikipedia]
=References=
<references />
'''[[Engines|Up one level]]'''
[[Category:WinBoard]]
[[Category:Feliks Pęczarski]]
