Deryni Checkmate has 302 pages.
Deryni Checkmate was created in 1972.
High Deryni has 339 pages.
Deryni Rising has 271 pages.
Deryni Rising was created in 1970.
High Deryni was created on 1973-08-12.
Deryni Adventure Game happened in 2005.
The ISBN of High Deryni is 0-345-23485-5.
There are many possibilities to get a checkmate in 10 moves, so there is not official "10 turn checkmate".
Katherine Kurtz has written: 'The Deryni archives'
in Arabic checkmate is مات
No, it is not possible to castle when in checkmate.
Checkmate is worth all of the pieces.