Psion Chess

This is the original chess program for the QL, written by Richard Lang and launched by Psion, it was originally published on the Sinclair Research Ltd label and later under Psion's own label.

Psion Chess played a very strong game at the time and was famous for its 3D board display. A version of Psion Chess (running on a full 32-bit Sage computer) shared first place with three dedicated computer chess machines at the 4th World Micro Computer Chess Championships in 1984/5.

Interestingly, the September 1985 issue of QL User showed how the program could be defeated using the Queen's Gambit opening.

The game was written entirely in 68000 machine code by Richard Lang, who had a lot of experience writing chess program for the Z80 and other systems. Psion chess for the Sinclair QL was, however, his first 68000 implementation. The 3D board and interface was written by Psion.

A version was also available for DOS based systems, the Apple Mac and Atari computers.

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Title: Psion Chess
Language: 68000 Machine Code
Author: Richard Lang
Publisher: Psion and Sinclair Research Ltd
Year of Publication: 1984
Platforms Suitable for: All Sinclair QLs and emulators
Commercial Status: Commercial
Price as at October 1984: £19.95
Reviews: QL User (December 1984/January 1985), QL User (December 1985)
Sources Available from: n/a
Latest Version available from: Unknown