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
Bidding box deal. The additional (non-call) cards are used as follows: The exact regulations for the use of bidding boxes vary according to the sponsoring authority. In the American Contract Bridge League, for example: Use of bidding boxes greatly improves the game for people with hearing impairment. For tournaments where bidding boxes are not available, sponsoring organizations will allow their use for the tables where they play. In the case of limited availability of the boxes, people with hearing problems will have precedence. Conversely, players with certain physical impairments (blindness, arthritis) may be unable to use bidding boxes and are exempted from