an early microcomputer chess program written by Bill Miller for the Z80 based TRS-80 Model 1, released in the late 70s and early 80s by Adventure International. Z-Chess had 7 levels of play to search up to 6 plies deep and could manage both castling and en passant .
- Gene Buza (1979). ABC's of "Z" Chess. Personal Computing, Vol. 3, No. 11, pp. 79
- Classic Computer Chess - ... The programs of yesteryear | programs | Z-Chess by Carey, hosted by the Internet Archive 
- Z-Chess (1979)(Bill Miller)[CMD] - ROMs Tandy TRS-80 - Tandy Radio Shack TRS-80 - Model 1 - Planet Emulation
- Z-Chess (1980)(Bill Miller)[CMD] - ROMs Tandy TRS-80 - Tandy Radio Shack TRS-80 - Model 1 - Planet Emulation