Psion Chess is programmed by Richard Lang, a computer chess champion in the
80s and programmer of some of the most advanced dedicated chess computers of
the epoque. The Atari ST version of Psion Chess is said to be a mildly
modified version of his “Amsterdam program” which won the 1985 world computer
chess championships.

Gamewise, Psion Chess has both 2D and fixed-perspective 3D views of the board,
visible both from the black and white sides, a full range of handicaps, move
suggestions, solutions for mate problems up to 10 levels, remi offers and most
other options a demanding chess player can ask for. A library of 50 master
parties is also available for viewing.

The Atari ST version has a ranking of 1960, whereas the Mac version has been
rated at 1793 over 80 parties.

Psion Chess