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[[../2H]] [[../2S]]

[参考]
A Multi-colored 2D opening bid shows one of the following hand types: 

https://www.bridgebum.com/multi_2d.php

http://www.bridgeguys.com/Conventions/multi_two_diamonds.html

The opener may not employ Multi Two Diamonds with a Diamond void.

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<<TableOfContents()>>

== 2 DIAMONDS open ==
2D : 
{{{
   (4441), 16-24 HCP OR  [4405]
   6 hearts, 6-10 HCP (change range?) OR 
   balanced, 25+-27 HCP, 3-4 Qs, 9+ points in quacks (balanced duck)      (forcing)
}}}
=== respponse 2H ===
{{{
2H :: not strong enough to bid over weak-two in hearts 
   P  : weak-two in hearts       

   (after a non-pass, all non asks are signoffs unless 4m, which are invitational to game in minor)  
   2S : major stiff, 16-19 HCP
      2N :: asking bid
          3C : 4144
             3H :: strength ask
                 {
                 3S : 16-17 HCP
                 3N : 18-19 HCP
                 }     4H :: [4-control ask]
                           response : 5H :: [queen ask]

             3D : 1444, 16-17 HCP 
                3S :: [4-control ask]
                   response : 4S :: [queen ask]
             3H : 1444, 18-19 HCP      
                3S :: [4-control ask] 
                   response : 4S :: [queen ask]  
   2N : 4441, 16-19 HCP
      3C :: strength ask
         {
         3D : 16-17 HCP
         3H : 18-19 HCP
         } 
            4C :: [4-control ask] 
                response : 5C :: [queen ask]

   3C : 4414, 16-19 HCP
      3D :: strength ask (step 1 = 16-17; step 2 = 18-19) 
          { 
          3H : 16-17 HCP
          3S : 18-19 HCP
          } 
             4D :: [4-control ask]
                response : 5D :: [queen ask]
   3D : 4144, 20-24 HCP   
      3H :: [6-control ask]
          response : 4H :: [queen ask]
   3H : 1444, 20-24 HCP   
      3S :: [6-control ask]
          response : 4S :: [queen ask] 
   3S : 4441, 20-24 HCP
      4C :: [6-control ask]
          response : 5C :: [queen ask]
   3N : balanced duck

2S :: 5+, forcing
    2N : (4441), 16-19 HCP
       3C :: singleton-ask
           3D : heart stiff
           3H : spade stiff
           3S : club stiff
           4C : diamond stiff
             further cues : 4-control then queen
    3m : 3-4, honor, 6+ hearts, 9-12 HCP 
       3D :: gf
       3M :: to play
       4X :: gf
    3H : 6+, 6-9 HCP
    3S : A/K/Q-doubleton or three, 6+ hearts
    3N : 4441, 20-24 HCP
    4C : 4414, 20-24 HCP 
    4D : 4144, 20-24 HCP
    4H : 1444, 20-24 HCP
       4S : to play
       4N : 6-control ask

2N :: balanced, forcing
    3C : 6+ hearts; 2/top 3, 3/top 5 (good suit)
       3H :: to play
       other :: gf
    3D : 6+ hearts; maximum
       3H :: forcing
           3N : balanced
           other : unbalanced
    3H : 6+ hearts; minimum
    3S : 4441, 16-24 HCP
       4C :: 4-control ask
    3N : 6+ hearts; AKQ of hearts
    4C : 4414, 16-24 HCP
       4D :: 4-control ask
    4D : 4144, 16-24 HCP
       4H :: 4-control ask
    4H : 1444, 16-24 HCP
       4S :: 4-control ask      

3C :: 5+, game invite values (14+ HCP?), forcing
    3D : feature in diamonds, maximum weak two 
       4C :: to play
       other :: gf
    3H : 6+, minimum weak two
    3S : feature in spades, maximum weak two, gf
    3N : 6+ hearts, maximum weak two, at least Qx in pointed suits
    4C : 3+, 6+ hearts
    4D : 4144, 16-24 HCP
    4H : 1444, 16-24 HCP
    4S : 4414, 16-24 HCP
    4N : 4441, 16-24 HCP

3D :: 5+, game invite values (14+ HCP?), forcing 
    3H : 6+, minimum weak two
    3S : feature in spades, maximum weak two, (gf?)
    3N : 6+ hearts, maximum weak two, at least Qx in black suits
    4C : 4144, 16-24 HCP
    4D : 3+, 6+ hearts
    4H : 1444, 16-24 HCP
    4S : 4414, 16-24 HCP
    4N : 4441, 16-24 HCP

3H :: 3, preemptive (how show balanced wonder -- 4N?)
    3S : 4441, 16-24 HCP
    3N : 4144, 16-24 HCP
    4C : 4411, 16-24 HCP
    4D : 1444, 16-24 HCP 

4H :: to play if weak-two
    4S : 4441, 16-24 HCP
    4N : 4144, 16-24 HCP
    5C : 4411, 16-24 HCP
    5D : 1444, 16-24 HCP
}}}

{{{
2D (overcall) X :: penalty
2D : response (overcall) X : opener has 4441 and 4 in the suit overcalled
2D : response (overcall) next step : opener has 4441 and 1 in the suit
2D (X) same except XX is used for X
}}}

== history ==
{{{

}}}
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