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
Singaporean bridge 1, 2, 4, 8, 16, 32, 64 points are scored for contracts of 7, 8, 9, 10, 11, 12, 13 tricks respectively. Both partners score the same points when contract are fulfilled. There is no extra point for over-trick, so players should try to bid to their full potential. There is a penalty for under-trick to prevent reckless pre-emptive bidding; the opponent score 1, 2, 4, 8, 16 points... and so on, depending on the number of under-tricks. The points for each game are recorded on a piece of paper with four columns for four players. In each game only