The card game auction bridge was developed from straight bridge in 1904 and was a precursor to contract bridge (Frey, Morehead, and Mott-Smith 1956).
The main difference between auction bridge and contract bridge is that in auction bridge a game is scored whenever the required number of tricks (9 in No Trump, 10 in Hearts or Spades, 11 in Clubs or Diamonds) is scored. In contract bridge the number of points from tricks taken past the bid do not count towards making a game. Because of this, accurate bidding becomes much more important in contract bridge: partners have to use the bidding to tell each other what their suits and strengths are, so a judgement can be made as to what the chances are of making a game.
The bidding, play and laws are the same as contract bridge.
A scoring table for Auction Bridge, from the Official Rules of Card Games, 1973 is as follows:
Odd-tricks: no trumps are worth 10; spades 9; hearts 8; diamonds 7; clubs 6.
Game was 30 points, and only odd-tricks...
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