An html version of queendown.cql.
Created by Gady Costeff and Lewis Stiller.
CQL 3.02
;; One side sacrifices a queen, and remains at least 9 points down in material for at least 12 moves, and then wins (match :pgn heijden.pgn :output queendown.pgn (position :result 1-0 :sequence( (position :powerdifference [Qq] -1000 -9 :powerdifference U -1000 -9) (position :powerdifference [Qq] -1000 -9) (position :powerdifference [Qq] -1000 -9) (position :powerdifference [Qq] -1000 -9) (position :powerdifference [Qq] -1000 -9) (position :powerdifference [Qq] -1000 -9) (position :powerdifference [Qq] -1000 -9) (position :powerdifference [Qq] -1000 -9) (position :powerdifference [Qq] -1000 -9) (position :powerdifference [Qq] -1000 -9) (position :powerdifference [Qq] -1000 -9) (position :powerdifference [Qq] -1000 -9) ) :flipcolor ))
After executing this with "> cql QueenDown.cql" there are 409 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 showed: