Cappelletti (also called Hamilton and Pottage[1]) is one of many defensive bridge bidding conventions used in the card game contract bridge to compete or interfere in the auction when an opponent has opened one notrump (1NT). Usually attributed to Michael Cappelletti and his longtime partner Edwin Lewis, origin of the concept is also claimed by Fred Hamilton, John Pottage and Gerald Helms.[2] Cappelletti can show a variety of one- and two-suited hands while retaining the penalty double for stronger hands.