An html version of DoubleCheckMateMiddleOfBoard.cql.

5.1 Created by Lewis Stiller

3.02 Created by Emil Vlasak. See EG206, page 284

CQL 5.1

; double check is mate, King not on edge of board

cql(input heijden.pgn)
 mate
 attacks 2 (A kb-g2-7)


CQL 3.02
; Find all positions with a mate with doubble check and the black king in the middle of the board. 
; A mirror mate is a Mating position in which all (eight) neighboring fields of the mated king are unoccupied.
(match
 :pgn heijden.pgn
 :output DoubleCheckMateMiddleOfBoard.pgn
 (position 
   :mate
   :attackcount A k 2
   k[b-g2-7]
  )
)

After executing this with "> cql DoubleCheckMateMiddleOfBoard.cql" there are 37 studies found in the Harold van der Heijden Database 2015.
NB. When you see {MATCH} in the text, it means that cql has found the position asked for.

Below only 1 study is presented: