An html version of Loman.cql which is not in the cql.zip file; Created by Gady Costeff.

See an explanation of this manoeuvre at Tim Krabbé's website.

; a square-vacating anti-promotion sacrifice
(match
  :pgn heijden.pgn
  :output Loman.pgn
(position rh4 Kg5 pg7 Ph7 k[f7,f8] 
 :wtm :flipcolor :shifthorizontal :flipvertical 
 :attackcount a rh4 0
 :attackcount K rh4 1
)
)

After executing this with "> cql Loman.cql" there are 26 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 5 studies are presented: