Contract bridge grand slam exists. The modern game of contract bridge was the result of innovations to the scoring of auction bridge by Harold Stirling Vanderbilt and others. The most significant change was that only the tricks contracted for were scored below the line toward game or a slam bonus, a change that resulted in bidding becoming much more challenging and interesting. Also new was the concept of "vulnerability", making sacrifices to protect the lead in a rubber more expensive. The various scores were adjusted to produce a more balanced and interesting game. Vanderbilt set out his rules in 1925, and within
Contract bridge parts of European Istanbul, where they apparently crossed every day to go to a coffeehouse to play cards." Bridge is a four-player partnership trick-taking game with thirteen tricks per deal. The dominant variations of the game are rubber bridge, more common in social play; and duplicate bridge, which enables comparative scoring in tournament play. Each player is dealt thirteen cards from a standard 52-card deck. A starts when a player leads, i.e. plays the first card. The leader to the first trick is determined by the auction; the leader to each subsequent trick is the player who won the preceding