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Found on
https://www.crosswordclues.com/clue/contract-bridge

Contract bridge, or simply bridge, is a trick-taking game using a standard 52-card deck. It is played by four players in two competing partnerships, with partners sitting opposite each other around a table. Millions of people play bridge worldwide in clubs, tournaments, online and with friends at home, making it one of the world`s most popular ca....
Found on
http://en.wikipedia.org/wiki/Contract_bridge

card game developed in the 1920s that was the final step in the historical progression from whist to bridge whist to auction bridge to contract ... [14 related articles]
Found on
http://www.britannica.com/eb/a-z/c/135

Contract Bridge is a variety of Auction Bridge in which only the exact number of tricks which the declarer contracts to make score towards the game. The variety evolved around 1912, and gained popularity from 1930 onwards.
Found on
http://www.probertencyclopaedia.com/browse/OC.HTM
noun a variety of bridge in which the bidder receives points toward game only for the number of tricks he bid
Found on
https://www.encyclo.co.uk/local/20974

Card game first played in 1925. From 1930 it quickly outgrew auction bridge in popularity. It is based on auction bridge, but used a different scoring system
Found on
https://www.encyclo.co.uk/local/21221
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