An html version of mzz5.cql. Created by Gady Costeff and Lewis Stiller.

; This locates all mutual zugzwang studies with exactly 5 pieces and at most one pawn
; This may not get all "true" mutual zugwang position. Rather, it gets you all the studies
; in which same position occurs, both with black and with white to move, but the white to move position
; occurs in the variation and the black to move position occurs in the main line.
(match
 :pgn heijden.pgn
 :output mzz5.pgn
 (position
  :piececount U 5 ;; 5 pieces
  :piececount [Pp] 0 1 ;; 0 or 1 pawns
  :btm 
  :relation ( 
	      :variationsonly
	      :changesidetomove)
 )
)

After executing this with "> cql Mzz5.cql" there are 584 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 10 are presented: