Auction Bridge, also known as International Bridge (IB), is a popular variation of the classic Bridge card game.
As the third major stage in the evolution of bridge, Auction Bridge & International Bridge (IB) developed directly from straight bridge (also referred to as bridge whist). It served as the direct predecessor to contract bridge, with both games tracing their origins back to whist and bridge whist.
Auction Bridge & IB features significantly different scoring systems for tricks, bonuses, and penalties compared to contract bridge. Notably, the concept of vulnerability does not exist in Auction Bridge & IB.
Trump selection follows nearly identical rules, though contract bridge introduces more complexity in this area. The gameplay and rules otherwise remain quite similar to contract bridge.
The dealer initiates the first trump selection and must commit to winning at least the odd trick in a trump suit or at No-trumps. Bidding progresses based on point values rather than trick counts (disregarding doubles). For instance, 3 Spades (27 points) outranks 4 Clubs (24 points).
Each trick beyond six scores as follows:
Notrumps: 10 points
Spades: 9 points
Hearts: 8 points
Diamonds: 7 points
Clubs: 6 points
Game requires 30 points
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