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SPOC stands for '''S'''elective '''P'''runing '''O'''ptimization '''C'''hess, claiming a new algorithm for the game, and was commercially available released in 1983by [https://en.wikipedia.org/wiki/Silicon_Valley Silicon Valley] based [https://en.wikipedia.org/wiki/Cypress_Semiconductor SDL Cypress Software], [https://en.wikipedia.org/wiki/San_Jose,_California San Jose, California]. In his review, along with the [[Chess Partner]] program, chess player and programmer [[Dave Whitehouse|Dave Whitehouse's]] recommendation was to wait for something better to come along <ref>[[Dave Whitehouse]] ('''1983'''). ''Biding Your Time With Computerized Chess''. [[PC Magazine]], September 1983, pp. 449-458</ref>. However, SPOC '''2.0''' was able to take back moves, to enter positions, and to [[Promotions|promote]] pawns to any piece <ref>[https://archive.org/details/SDL_Cypress_Software SDL Cypress Software] hosted by the [https://en.wikipedia.org/wiki/Internet_Archive Internet Archive]</ref>.