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This is an artificial bid forcing partner to bid again, absent interference by the opposition. After either partner has bid a minor suit, the bid of the other minor is one round forcing.
                            QJx                          Qxx                                                   Axx                          QJxx                           AKxxx                          xx                          AQx                          Kx        W           N           E                 W       P            1C          P                1S       P            1NT        P               2D(!)       P              2S         P               4S P/O