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Basics of 1 Club/1 Diamond

 

            These bids were developed as an extension of 2 over 1 bids.  One club is the only one level opening bid that doesn't have a 2 level bid possibility to create a game force.  Even though methods have been devised to create a game force after a one club opener, the force usually doesn't occur until the two level with bids like fourth suit forcing, for example, among others.  The game force occurs after a 1 diamond response to opener's one club, leaving plenty of room to establish suit and game or slam level.  In addition, there are inferences available when responder doesn't bid 1 diamond, i.e., responder has less than 12 points.

 

1 diamond response to 1 club opener by 1st or 2nd seat shows 12+ points and is artificial in diamonds.

 

Responder bids 1 diamond with all hands containing a good 12 or more points.

 

Once responder bids 1 diamond over opener's 1 club, most of the bids are natural and have logical inferences.

 

Some typical point showing bids by opener are:

Opener            Responder

1C                   1D

1NT                                         shows 12-14 points and no 4 card major

 

1C                   1D

2NT                                         shows 18-19 points and no 4 card major

 

 

Other sequences would be:

Opener            Responder

1C                   1D

1H                                           12+ pts, 4 hearts

1S                                            12+ pts, 4 spades

2C                                           12+ pts, 6+ clubs

 

2D                                           12+ pts, 5 clubs, 4 diamonds

Note, with 2-2-4-5 distribution, and 12-14 points, responder would be better off bidding 1 NT.  With 18+ points and 2-2-4-5 distribution, responder would bid 2 NT.  Thus 2D could show 1-3-4-5 or 3-1-4-5 with 15-19 points or 2-2-4-5 with 12-17 points.

 

1C                   1D

1NT                 3NT                 12-17 pts, no 5 card major

Opener has a 12-14 point hand and no 4 card major.  Thus, 3 NT is the inevitable contract.

 

1C                   1D

1NT                 2H                   12+ pts, 5+ hearts

                        2S                    12+ pts, 5+ spades

Opener has denied having a 4 card major.  As a result, responder would need at least a 5 card major suit to make these bids.

 

 

1C                   1D

2C                   2H                   12+ pts, 5+ hearts

                        2S                    12+ pts, 5+ spades

 

1C                   1D

1H                   1NT                 12-14 pts, no 4 card major

                        2NT                 18-19 pts, no 4 card major