Checkmate #23 was published by DC Comics on December 1, 1989, as part of a series that began in 1988. Paul Kupperberg writes, and art comes from Al Vey, Julianna Ferriter and Kevin Rubio. This 36-page issue features Harvey Bullock, Peacemaker, Valentina Vostok, Harry Stein and Black Thorn, among 14 characters cataloged on VerseDB.