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

;; Finds all studies with Allumwandlung, including mixed, in the main line.
;; The order of position keywords inside the match keyword is not significant.
(match
 :pgn heijden.pgn
 :output allumwandlung.pgn
 (position :promote [Nn])
 (position :promote [Bb])
 (position :promote [Rr])
 (position :promote [Qq])
)

After executing this with "> cql Allumwandlung.cql" there are 56 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 5 studies are presented: