Precision - Two diamond

The requirement for an opening bid of two diamonds is 10 - 13 points and a three-suited hand.
The allowed shapes are 4-4-4-1 or 5-4-4-0 or 5-4-3-1 with a 3 card minor.
There will be some overlaps with the other opening bids.
Responder's only forcing bid is 2 No Trump - a relay asking for the shortage.
All other bids are used to scramble to the lowest playable contract.

A summary of the scheme:

Open Resp Rebid    
         
2D     11-14 pts; 4-4-4-1, 5-4-4-0 or 5-4-3-1(3 card minor) shape  
  2H   non-forcing, 3 or more hearts; Scramble to the lowest playable contract  
    Pass 4 or 5 hearts  
    2S Shortage in heart; 4 or 5 spades; Responder bids as follows:
   Pass: spade tolerance
   2N: asks opener to bid better minor
   3C, 3D: to play; opener will pass
 
  2S   non-forcing, 3 or more spades ( more spades than hearts )  
    Pass 4 or 5 spades  
    2N short spade; asks responder to bid better minor ( opener is 4-4 )  
    3C,3D 5 card suit; responder will pass  
    3S Inviting; 4 or 5 spades  
  2N   forcing to game; asks opener to show shortness  
    3C short diamonds; Responder bids as follows:  
      3D: Relay  
          Opener bids 3H with 5 spades and 4 hearts  
          Opener bids 3S with 5 hearts and 4 spades  
          Opener bids 3N with 4 spades and 4 hearts  
    3D short hears; responder relays with 3H to ask for 5 card minor  
    3H short spades; responder relays with 3S to ask for 5 card minor  
    3S short clubs; 4-4 in the majors  
    3N short clubs; 5-4 in the majors
Responder relays with 4C; Opener bids:
    4D with 5 hearts
    4H with 5 spades
 
  3C   To play; must have tolerance for diamonds  

Response after a takeout double:
   Pass: 0 - 6 points
   Redouble: 7 - 11 points; no major
   2H,2S: 7 - 11 points; 4+ cards
   2N: System on
Response after an overcall:
   Pass: 0 - 6 points
   Double: Negative


If LHO intervenes and it is passed back to the opener, opener is obliged to double with a shortage in the opponent's suit.
Remember partner's double is negative.


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