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Paul Stein was member of a group of H-bomb researchers around Stanislaw Ulam, [[Mark Wells]] and [[John Pasta]] et al., who wrote the [[MANIAC I|chess-playing program]] <ref>[[Paul Stein]], [[Stanislaw Ulam]] ('''1957'''). ''Experiments in chess on electronic computing machines''. Chess Review, 13 January 1957.</ref> <ref>[[James Kister]], [[Paul Stein]], [[Stanislaw Ulam]], [[William Walden]], [[Mark Wells]] ('''1957'''). ''[http://dl.acm.org/citation.cfm?id=320868.320877&coll=DL&dl=GUIDE&CFID=628969023&CFTOKEN=30690604 Experiments in Chess]''. [[ACM#Journal|Journal of the ACM]], Vol. 4, No. 2</ref> for the [https://en.wikipedia.org/wiki/MANIAC_I MANIAC I] in 1956. It played [https://en.wikipedia.org/wiki/Los_Alamos_chess [Los Alamos chessChess]] on a 6×6 board without bishops.