LAW 18 - BIDS

1. Proper Form
   A bid designates a number of odd tricks (tricks in excess of six), from one to seven, and a denomination. (Pass, double and redouble are calls but not bids.)
2. To Supersede a Bid
   A bid supersedes a previous bid if it designates either the same number of odd tricks in a higher ranking denomination or a greater number of odd tricks in any denomination.
3. Sufficient Bid
   A bid that supersedes the last preceding bid is a sufficient bid.
4. Insufficient Bid
   A bid that fails to supersede the last preceding bid is an insufficient bid. It is an infraction to make an insufficient bid (see Law 27 for rectification).
5. Rank of the Denominations
   The rank of the denominations in descending order is: notrump, spades, hearts, diamonds, clubs.
6. Different Methods
   Regulating Authorities may authorize different methods of making calls.