An html version of mirrormate.cql.

Created by Gady Costeff and Lewis Stiller.

CQL 5.1 example and more can be found at the website of GadyCosteff.

CQL 3.02
; Find all positions with mirror mate in the main line. 
; A mirror mate is a mating position in which all (eight) neighboring fields of the mated king are unoccupied.
(match
 :pgn heijden.pgn
 :output mirrormate.pgn
 (position
  :attackcount k . 8
  :mate
 )
)

After executing this with "> cql MirrorMate.cql" there are 59 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 4 studies are presented: