The card game auction bridge, the third step in the evolution of the general game of bridge, was developed from straight bridge (i.e. bridge whist) in 1904. The precursor to contract bridge, its predecessors were whist and bridge whist.
Bidding box containing all possible calls a player can make in the auction
|Skills required||Tactics and Strategy|
|Card rank (highest first)||A K Q J 10 9 8 7 6 5 4 3 2|
|Playing time||25 min.|
|Random chance||Low to Moderate|
|Whist, Contract Bridge|
Auction bridge trick scoring, bonus scoring, and penalty scoring are radically different from contract bridge, and there is no concept of vulnerability in auction bridge.
Bidding rules are nearly the same, although in contract bridge bidding many complex artificial bids and bidding systems have evolved.
It is not certain to whom auction bridge should be credited. A letter in The Times (London), January 16, 1905, signed by Oswald Crawfurd, describes auction bridge as first played in 1904, while a book by "John Doe" (Francis Reginald Roe), published in Allahabad, India, in 1899, puts forward auction bridge as an invention of three members of the Indian Civil Service stationed at an isolated community, designed a three-handed form of bridge to compensate the lack of a fourth player. Their key contribution was the concept of competitive bidding for the declaration.
The bidding, play and laws are similar to contract bridge.
The dealer opens the bidding and must declare to win at least the odd trick in a trump suit or at No-trumps; he cannot pass the bid. A bid is higher if it contracts for a higher number of points (ignoring doubles) rather than a higher number of tricks. As an example 3 Spades (27 points) beats 4 Clubs (24 points). 
Auction bridge scoring is as follows:
- Each trick exceeding six scores:
- Notrumps: 10 points
- Spades: 9 points
- Hearts: 8 points
- Diamonds: 7 points
- Clubs: 6 points
- Game is 30 points, and only odd-tricks count towards game. The first side to win two games wins the rubber and scores a 250-point bonus.
- Each under-trick is worth 50 points to the opponents.
- Small slam is worth 50 points; grand slam is worth 100 points.
- Honours are scored as follows:
- Four trump honours in one hand: 80
- Five trump honours (or four aces in notrump) in one hand: 100
- For an additional honour in partner's hand, or for three or more honours divided between both hands: 10 each
- Contracts could be doubled and redoubled, which doubled or quadrupled the odd-trick and under-trick amounts. In addition there was a bonus of 50 points for making a doubled contract and for each over-trick, this was doubled if the contract was redoubled.
- Manley, Brent, Editor; Horton, Mark, Co-Editor; Greenberg-Yarbro, Tracey, Co-Editor; Rigal, Barry, Co-Editor (2011). The Official Encyclopedia of Bridge (7th ed.). Horn Lake, MS: American Contract Bridge League. p. 8. ISBN 978-0-939460-99-1.CS1 maint: extra text: authors list (link)
- Albert H. Morehead, Richard L. Frey, Geoffrey Mott-Smith The New Complete Hoyle pg. 118 Doubleday Garden City Books (1956) Garden City, New York
- Richard A. Epstein The theory of gambling and statistical logic pg. 271 Academic Press, rev. ed. (1994) ISBN 0-12-240761-X
- Outlines of Auction Bridge by Charles Stuart Street Library of Congress 0 029 604 586 A
- Official Rules of Card Games, 1973