Deryni Checkmate is a fantasy novel by American-born author Katherine Kurtz. It was first published by Ballantine Books as the forty-sixth volume of the Ballantine Adult Fantasy series in May 1972, and has been reprinted a number of times since. The author released a revised and updated edition of the novel that was published by Ace Books in 2005. Deryni Checkmate was the second of Kurtz' Deryni novels to be published, and also the second book in the Chronicles of the Deryni Trilogy. Source: Wikipedia (en)