A non-playing person designated to move boards between tables during a tournament.
Call
Any bid, pass, double, or redouble in the bidding stage.
Chicago
A form of bridge in which a rubber is completed every four deals, and the vulnerability is different in each of those deals. The scoring and sequence of dealer and vulnerability used in duplicate bridge are derived from those used in Chicago bridge. Chicago is said to have been devised by commuters who played bridge on daily train journeys, where the time available for play was limited by the length of the trip.
CHO
Centre Hand Opponent; a slang term for the partner.
A variation of the convention, known as Roman Blackwood, was popularized by famous Italian Blue Team. In Roman Blackwood, the responses are even more ambiguous, but more space-conserving. The basic outline of responses is:
