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 partnership will adopt, which must be higher than the previous highest bid (if any). Eventually, the player who bid the highest contract—which is determined by the contract's level as well as the trump suit or no trump—wins the contract for their partnership. In the example auction on the right, the East-West pair secures the contract of 6; the auction concludes when there have been three successive passes. Note that six tricks are added to contract values, so the six-level contract would actually be a contract of twelve tricks. In practice, establishing a contract without enough information on the other partner's