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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).