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Laws of On Line Bridge published by the WBF in 2001

(changes only, marked vs. relevant subsections of Laws of Duplicate Contract Bridge 1997)


Law 21 - Call Based On Misinformation

B. Call Based on Misinformation from an Opponent
  1. Change of Call
    Until the end of the auction period (see Law 17E and footnote), a player may, without penalty, change a call when it is probable that he made the call as a result of misinformation given to him by an opponent (failure to alert promptly to a conventional call or special understanding, where such alert is required by the sponsoring organisation, is deemed misinformation), provided that his partner has not subsequently called.