| Issue | #21 |
| Published | October 1989 |
| Cover Price | 1.50 |
| Pages | 36 |
| Editing | Jonathan Peterson |
| Characters | Checkmate Soldier; Bishop |
| Genre | Superhero; Detective |
| Pencils | Steve Erwin |
| Inks | Keith Wilson [as KEZ] |
| Characters | FEATURE: Checkmate [Winston O'Donnell; Conrad Mackay]; GUESTS: Harry Stein; Sarge Steel; Val Vostok; Harvey Bullock; VILLAIN: Bishop; CAMEO: Peacemaker |
| Synopsis | Checkmate is sent in to investigate the person who is blackmailing California farmers into selling their water rights. |
| Genre | Superhero; Detective |
| Script | Paul Kupperberg |
| Pencils | Steve Erwin |
| Inks | Al Vey |
| Colors | Julianna Ferriter |
| Letters | John Costanza |