This is a Shareware program that converted the original KIM-1 Microchess (1977) to a Commodore 64/128. The chess board positions are numbers from 00 (top left of chess board) to 77 (bottom right of chess board)
KIM-1 Microchess written by Peter Jennings was the first commercial chess program ever produced.
For example the game moves are played as follows: Human plays white: 1. 64 44 (e2-e4_ 13 33 (d7-d5) 2. 44 33 (e4xd5) etc. Good luck in trying to complete a game !