Socrates
Socrates was a series of DOS chess programs by Don Dailey and Larry Kaufman. Socrates was initially the 8086 assembly port of the C program Heuristic Alpha, developed for Julio Kaplan's company Heuristic Software. It had its tournament debut at the ACM 1991. While the C program evolved to Mini and Titan aka Socrates II, winner of the ACM 1993 on a 486 PC ahead of Cray Blitz and HiTech, later sold to Electronic Arts as engine of the mass-market entry Kasparov's Gambit, its 32-bit x86 assembly counterpart Socrates, the best program at Harvard Cup 1992 with 3 out of 5, beating grandmasters Patrick Wolff, Maxim Dlugy and John Fedorowicz, incorporated knowledge from Titan and evolved to Socrates 3.0, finally released and commercially market in 1993 not by Heuristic Software, but through a company called MDI. Since Larry Kaufman mentioned in 1992 that Null Move Pruning doubles the speed of the search, NMP was likely also implemented in Socrates.
How to play:
Click on the joystick icon in the Socrates online emulator to see how to control the Socrates game
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