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Verb (to castle) The act of supplementing one’s pint of ale or stout with some form of hard spirit, traditionally a whisky. The glass containing spirit sits alongside the pint, separately. A punter of a drinking establishment who has a pint and a separate spirit on the go, simultaneously, is said to be drinking "castle kingside". The term is derived from the chess move of the same name, whereby the king is moved two squares towards a rook (castle) on the player's first rank, then the rook is moved to the square over which the king crossed. The outcome leaves the king and rook side-by-side.
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