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'''[[Main Page|Home]] * [[Engines]] * Y!'''
[[FILE:TurboKit20.jpg|border|right|thumb|[[6502#TK20 |TurboKit 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 [[:Category:Opening Book AuthorsAuthor|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=
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]].
=See also=
* [[Conchess]]
* [[Princhess]]
=External Links=
=References=
<references />
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[[Category:6502]]
