Checkmate: Universe

From Author Wars - https://authorwars.com/books/checkmate-universe-907693.html

Overview:

Title: Checkmate: Universe
Author: Kurt Mahr
Year: 1975
Type: Short Fiction

Editions/Publications:

Unknown. Perry Rhodan #74: Checkmate: Universe (Unknown, Kurt Mahr, Ace Books, $1.25, 164 pages, Paperback, MAGAZINE)