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Y!
,Created page with "'''Home * Engines * Y!''' border|right|thumb|TK20 <ref>Image from [[ICT 2006 and 13th Chess Computer Users (Gebruikers) tournament o..."
'''[[Main Page|Home]] * [[Engines]] * Y!'''
[[FILE:TurboKit20.jpg|border|right|thumb|TK20 <ref>Image from [[ICT 2006]] and 13th Chess Computer Users (Gebruikers) tournament old [[CSVN]] site [http://old.csvn.nl/gallery24.html Photo Gallery 24], Photos by [[Eric van Reem]] and [[Kees Sio]]</ref> ]]
'''Y!''' (Why Not), <br/>
a chess program written by primary author [[Ulf Rathsman]], supported by [[Lars Hjörth]] and [[Opening Book Authors|book author]] [[Sandro Necchi]]. It was written in [[6502]] [[Assembly|assembly]] and played tournaments on the [[6502#TK20|TurboKit TK20]] by ''Schaetzle+Bsteh'' <ref>[http://www.schach-computer.info/wiki/index.php/TurboKit TurboKit – Schachcomputer.info Wiki]</ref>. Y! competed the [[WMCCC 1988]] as Y!88 and the [[WMCCC 1989]] and [[WCCC 1989]] as Y!89 (Why Not 89).
=Photos=
[[FILE:WMCCC88YNot.jpg|none|border|text-bottom|640px]]
[[Ulf Rathsman]] and [[Sandro Necchi]] of [[Y!|Y!88]] at the [[WMCCC 1988]] in [https://en.wikipedia.org/wiki/Almer%C3%ADa Almería] <ref>Image by [[László Lindner]] from [[László Lindner]] ('''1989''').''Die wiederauferstandene Mikro-Weltmeisterschaft - 8.Mikroschachcomputer - WM 1988 in Almeria''. [https://de.wikipedia.org/wiki/Rochade_Europa Europa-Rochade], 01/02-1989, [http://schaakcomputers.nl/hein_veldhuis/database/files/11-1988,%20Europa-Rochade,%20Die%208.%20Mikroschachcomputer-WM%201988%20in%20Almeria.pdf pdf] hosted by [[Hein Veldhuis]] (German)</ref>
=Description=
based on the [[WCCC 1989]] booklet <ref>[http://www.computerhistory.org/chess/full_record.php?iid=doc-434fea055cbb3 Kings Move - Welcome to the 1989 AGT World Computer Chess Championship.] Edmonton, Alberta, Canada, Courtesy of [[Peter Jennings]], from [[The Computer History Museum]], [http://archive.computerhistory.org/projects/chess/related_materials/text/3-1%20and%203-2%20and%203-3%20and%204-3.1989_WCCC/1989%20WCCC.062302028.sm.pdf pdf]</ref>:
Y!89 uses a full, partly extended, width iterative [[Principal Variation Search|principal variation search]] with [[Captures|capture]] and [[Promotions|promotion]] [[Quiescence Search|searches]] in [[Quiescent Node|terminal nodes]]. The program is designed to be used in a cheap commercial environment, thus the work [[Memory|memory]] is still just 4 kbytes of [[Memory#RAM|RAM]], and the good old [[6502]] eight bit processor is used in tournaments emulated by the also commercially available [[6502#TK20|Turbo kit]]. The [[Search|search]] is fast for a micro, and includes detection of [[Repetitions|repeated positions]] (actual as well as potential), and performs [[Extensions|extensions]] for [[Check Extensions|check evasions]], [[Passed Pawn Extensions|passed pawn moves]] and some king moves in [[Pawn Endgame|pawn endgames]].
Most of the [[Material|material]] and [[Evaluation of Pieces|positional evaluation]] is made [[Incremental Updates|incrementally]] by the means of material value tables and [[Piece-Square Tables|positional score boards]] for each piece type, created once for each position of the game with the computer to move. Some "absolute" evaluation is also done, e.g. for static evaluation of [[Unstoppable Passer|unstoppable passed pawns]] and [[Pawn Structure|pawn structure]].
=External Links=
* [https://www.game-ai-forum.org/icga-tournaments/program.php?id=356 Y!'s ICGA Tournaments]
* [https://www.game-ai-forum.org/icga-tournaments/program.php?id=455 Why Not 89's ICGA Tournaments]
* [http://www.schach-computer.info/wiki/index.php/Conchess Conchess] – [http://www.schach-computer.info/wiki/index.php/Hauptseite_En Schachcomputer.info Wiki] (German) <ref>[[Karsten Bauermeister]] ('''1998'''). ''Die Geschichte der Conchess-Schachcomputer''. [[Computerschach und Spiele]], Heft 4, August-September 1998</ref>
=References=
<references />
'''[[Engines|Up one level]]'''
[[FILE:TurboKit20.jpg|border|right|thumb|TK20 <ref>Image from [[ICT 2006]] and 13th Chess Computer Users (Gebruikers) tournament old [[CSVN]] site [http://old.csvn.nl/gallery24.html Photo Gallery 24], Photos by [[Eric van Reem]] and [[Kees Sio]]</ref> ]]
'''Y!''' (Why Not), <br/>
a chess program written by primary author [[Ulf Rathsman]], supported by [[Lars Hjörth]] and [[Opening Book Authors|book author]] [[Sandro Necchi]]. It was written in [[6502]] [[Assembly|assembly]] and played tournaments on the [[6502#TK20|TurboKit TK20]] by ''Schaetzle+Bsteh'' <ref>[http://www.schach-computer.info/wiki/index.php/TurboKit TurboKit – Schachcomputer.info Wiki]</ref>. Y! competed the [[WMCCC 1988]] as Y!88 and the [[WMCCC 1989]] and [[WCCC 1989]] as Y!89 (Why Not 89).
=Photos=
[[FILE:WMCCC88YNot.jpg|none|border|text-bottom|640px]]
[[Ulf Rathsman]] and [[Sandro Necchi]] of [[Y!|Y!88]] at the [[WMCCC 1988]] in [https://en.wikipedia.org/wiki/Almer%C3%ADa Almería] <ref>Image by [[László Lindner]] from [[László Lindner]] ('''1989''').''Die wiederauferstandene Mikro-Weltmeisterschaft - 8.Mikroschachcomputer - WM 1988 in Almeria''. [https://de.wikipedia.org/wiki/Rochade_Europa Europa-Rochade], 01/02-1989, [http://schaakcomputers.nl/hein_veldhuis/database/files/11-1988,%20Europa-Rochade,%20Die%208.%20Mikroschachcomputer-WM%201988%20in%20Almeria.pdf pdf] hosted by [[Hein Veldhuis]] (German)</ref>
=Description=
based on the [[WCCC 1989]] booklet <ref>[http://www.computerhistory.org/chess/full_record.php?iid=doc-434fea055cbb3 Kings Move - Welcome to the 1989 AGT World Computer Chess Championship.] Edmonton, Alberta, Canada, Courtesy of [[Peter Jennings]], from [[The Computer History Museum]], [http://archive.computerhistory.org/projects/chess/related_materials/text/3-1%20and%203-2%20and%203-3%20and%204-3.1989_WCCC/1989%20WCCC.062302028.sm.pdf pdf]</ref>:
Y!89 uses a full, partly extended, width iterative [[Principal Variation Search|principal variation search]] with [[Captures|capture]] and [[Promotions|promotion]] [[Quiescence Search|searches]] in [[Quiescent Node|terminal nodes]]. The program is designed to be used in a cheap commercial environment, thus the work [[Memory|memory]] is still just 4 kbytes of [[Memory#RAM|RAM]], and the good old [[6502]] eight bit processor is used in tournaments emulated by the also commercially available [[6502#TK20|Turbo kit]]. The [[Search|search]] is fast for a micro, and includes detection of [[Repetitions|repeated positions]] (actual as well as potential), and performs [[Extensions|extensions]] for [[Check Extensions|check evasions]], [[Passed Pawn Extensions|passed pawn moves]] and some king moves in [[Pawn Endgame|pawn endgames]].
Most of the [[Material|material]] and [[Evaluation of Pieces|positional evaluation]] is made [[Incremental Updates|incrementally]] by the means of material value tables and [[Piece-Square Tables|positional score boards]] for each piece type, created once for each position of the game with the computer to move. Some "absolute" evaluation is also done, e.g. for static evaluation of [[Unstoppable Passer|unstoppable passed pawns]] and [[Pawn Structure|pawn structure]].
=External Links=
* [https://www.game-ai-forum.org/icga-tournaments/program.php?id=356 Y!'s ICGA Tournaments]
* [https://www.game-ai-forum.org/icga-tournaments/program.php?id=455 Why Not 89's ICGA Tournaments]
* [http://www.schach-computer.info/wiki/index.php/Conchess Conchess] – [http://www.schach-computer.info/wiki/index.php/Hauptseite_En Schachcomputer.info Wiki] (German) <ref>[[Karsten Bauermeister]] ('''1998'''). ''Die Geschichte der Conchess-Schachcomputer''. [[Computerschach und Spiele]], Heft 4, August-September 1998</ref>
=References=
<references />
'''[[Engines|Up one level]]'''
