The Laws of Duplicate Bridge, formerly known as the Laws of Duplicate Contract Bridge, is the official rule book of duplicate bridge promulgated by the World Bridge Federation. The first Laws of Duplicate Contract Bridge were published in 1928. They were successively revised in 1933, 1935, 1943, 1949, 1963, 1975, 1987, 1997 and 2007. The Laws are effective worldwide for all duplicate bridge tournaments sponsored by WBF, zonal, national and subordinate organizations (which includes most bridge clubs).
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