An html version of bristol.cql. Gady Costeff and Lewis Stiller.

;;look for queen-bishop bristols
;;

(match
 :pgn heijden.pgn
 :output bristol.pgn
 (position
  :sequence
  ((position :movefrom Bd4
	     Q[c3,e3,e5,c5]
	     :shift)
   (position)
   (position :movefrom Q :raydiagonal (B Q))
   (position Bd4 Q[c3,e4,e5,c5] :shift)
   )
  )
 )
After executing this with "> cql Bristol.cql" there are 8 studies found in the Harold van der Heijden Database V 2015.
NB. When you see {MATCH} in the text, it means that cql has found the position asked for.

Bristol theme. Anti-critical manoeuvre in which a piece moves over a critical target square allowing another piece to play over that same line to the critical square (thus employing an anti-metocritical manoeuvre).

The difference with the Turton voidance is that in a Bristol voidance, the critical piece performs no role in further play in support of the attacking piece.

Below only 4 studies are presented: