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 the goal of bridge is not simply to take the most tricks in a deal. Instead, the goal is to successfully estimate how many tricks one's partnership can take. To illustrate this, the simpler partnership trick-taking game of Spades has a similar mechanism: the usual trick-taking rules apply with the trump suit being spades, but in the beginning of the game, players "bid" or estimate how many tricks they can win, and the number of tricks bid by both players in a partnership are added. If a partnership takes at least that many number of tricks, they receive points for