Comic Title: Checkmate #23
Publisher: DC (DC Comics Inc.)
Address: 666 Fifth Avenue, New York, NY
Cover Date: December 1989
On Sale Date: October 31, 1989 Shipping Date October 31, 1989
Source: Previews, #8

Shipping Date October 31, 1989
Source: Amazing Heroes, #172

Shipping Date November 2, 1989
Source: Advance Comics, #10

Copyright Date October 31, 1989
Source: Library of Congress, Copyright Office 1989

Frequency: Monthly
Cover Price: $1.50
Page Count: 32
Editor: Jonathan Peterson

Title: "Peaceful Knights"
Pages: 24

Feature(s):
Checkmate

Writer: Paul Kupperberg
Penciller: Steve Erwin
Inker: Al Vey
Letterer: John Costanza
Colorist: Julianna Ferriter

Feature Character(s)

• Checkmate (last appearance in Checkmate #22; next appearance in Checkmate #24)
• Harry Stein (last appearance in Checkmate #22; next appearance in Checkmate #24)
• Harvey Bullock (last appearance in Checkmate #21; next appearance in Checkmate #25)

Supporting Character(s)

• Peacemaker (last appearance in Checkmate #22; next appearance in Checkmate #24)
• Kalia Campbell (last appearance in Checkmate #22; next appearance in Checkmate #24)
• Valentina Vostok (last appearance in Checkmate #21; next appearance in Checkmate #25)
• Black Thorn (last appearance in Checkmate #22; next appearance in Checkmate #26)
• Bridgette D'Abo (last appearance in Checkmate #20; next appearance in Checkmate #26)

Villain(s)

• Flowers (an assassin; first appearance; next appearance in Checkmate #24)
• Willy Horton (a middleman for the mob; no further appearances)
• Willy's associates (Donnie and Alfie named; no further appearances)
• Antonio Ritolli (a mob boss; next appearance in Checkmate #24)
• Andre Mazarin (the chairman of Disarmament International; not named in this story; first appearance; next appearance in Checkmate #24)

Guest Appearance(s)

• Ross Llwellyn (last appearance in Peacemaker #4; next appearance in Checkmate #25)
• Wolfgang Schmidt's ghost (in Peacemaker's delusions; last appearance in Checkmate #22; next appearance in Checkmate #24)
• Dominique St. Claire (last appearance in Peacemaker #4; next appearance in Checkmate #25)
• Frank Keller (first name incorrectly given as Fred in this story; last appearance in Peacemaker #3; no further appearances)

Other Character(s)

• Dr. MacClennon and Dr. Coolidge (both die in this story; no further appearances)
• Gino (an informant; no further appearances)
• Prof. Braddock (next appearance in Checkmate #24)
• Karl Schiller (an Interpol detective; next appearance in Checkmate #24)
• Helmut (Schiller's boss; no further appearances)

Comments:
This story continues in Checkmate #24.

Synopsis:
Several scientific leaders in their fields of study have met recent death by the hands of an assassin. Peacemaker searches for the killer by attacking underworld informants around Europe. One of the next targets of the assassin is Braddock, a scientist working for Checkmate, who is currently examining the remains of Bishop's armor. Elsewhere, Harvey Bullock continues to bring Black Thorn into Checkmate.