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
The Official Encyclopedia of Bridge Bridge" was simple to state: "To provide an official and authoritative answer to any question a reader might ask about the game of contract bridge and its leading players." On its dust jacket, the first edition states: This encyclopedia is the most complete and authoritative book of information, guidance, and instruction for bridge players, ever published. It covers every aspect of bridge in all bridge-playing countries of the world; it contains complete and lucid definitions of every term; it describes and illustrates every standard bid, every recognized convention, and every type of play. The first edition is divided into two