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 The Official Encyclopedia of Bridge The Official Encyclopedia of Bridge (OEB) presents comprehensive information on the card game contract bridge with limited information on related games and on playing cards. It is "official" in reference to the American Contract Bridge League (ACBL) which authorized its production and whose staff prepared and/or supervised its various editions. The first edition of the "Encyclopedia" was published in 1964 with Richard Frey as Editor-in-Chief; it was the only one with an edition revised for an overseas market ("The Bridge Players' Encyclopedia", 1967). The seventh and latest edition was published in 2011 following intermediate editions