MICROCHESS 3 from Norgayer Software came out in 1983. The author is unknown, however with the name MICROCHESS 3, it is possible that the chess engine was written by Peter Jennings who wrote the original Microchess. MICROCHESS 3 is identical to Petchess 4000 which came out in 1981. It is unclear whether the program was modified for the MICROCHESS 3 version, but probably it is exactly the same. The the chess board and screen have a different color to Petchess 4000.
You can see PETCHESS 4000 for the Commodore 64 here:
To access the game options, you press: ] then followed by the letter. ie ] + L = Levels, ] + N = New Game. ] + H = Help (The Help screen will show you all the options and setup commands available in the game).
The game is enjoyable to play and has a fairly decent openings library.
Estimated rating for MICROCHESS 3 is 1100 - 1200 ELO (1300 - 1400 USCF).