Checkmate #30 was published by DC Comics on August 1, 1990, as part of a series that began in 1988. Paul Kupperberg writes, and art comes from Julianna Ferriter, Michael Bair and Steve Erwin. This 36-page issue features Sarge Steel, Valentina Vostok, Harry Stein, Winston O'Donnell and Jacques Reynard, among 9 characters cataloged on VerseDB.