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Multi 2 Diamonds 

Multi 2 Diamonds is an openning system devised by Terence Reese and jeremy Flint.  Multi 2 Diamonds openning promises either;

1. A weak 2 major openning hand (6-11 HCPs and 6 cards of a major), or

2. A strong 2 bid in a minor suit with 19-22 HCPs, or

3. 19-22 HCPs and 4441 distribution hand.

In this system 2 Spades and 2 Hearts opennings may be applied as strong opennings, and 2 Clubs openning may be 23+ HCPs with any kind of hand which is a game forcing. Albaran convention may be applied in 2 Club opennings.

Responses to Multi 2 Diamonds openning may be in three ways. 2 Hearts means "let's play your major" with a weak hand, 2 Spades means "let's play Spades if your major is Spades, but may be game if your major is Hearts", and 2 NT shows 14+ HCPs and forces the opener to explain his hand.  Let's see the possible auction sequences at the below tables.

Opener

Responder

Opener

Expalanation

Responder Explanation Opener Explanation

2 Diamonds

2 Hearts

Pass
2 Spades
2 NT
 
 
 
 
 
3 Clubs
 
 
 
 
 
 
 
3 Diamonds
3 Hearts
3 Spades
 
Weak 2 Hearts
Weak 2 Spades
19-22 unbalanced
 
 
 
 
 
19-22 HCP 4414
 
 
 
 
 
 
 
19-22 HCP 4144
19-22 HCP 1444
19-22 HCP 4441
 
Pass
3 Clubs
 
3-4 Diamonds
3-4 Hearts
3 Spades
3 NT
3 Diamonds
3 Hearts
3 Spades
3 NT
4 Clubs
4 Hearts
4 Spades
5 Clubs
3 Hearts
Same as above

 

 
 
Ask the long suit
 
Transfer
Transfer
Transfer to minors
Game
Very weak hand
Slam in Hearts
Slam in Spades
Game
Slam in Clubs
Game
Game
Game
Very weak hand
 
 
 
 
3 Diamonds
3 NT
 
 
 
 
3 Hearts
Controls
Controls
Pass
Controls
Pass
Pass
Pass
3 Spades
 
 
 
Length in Diamonds
Length in Clubs
 
 
 
 
 
 
 
 
 
 
 
 
 

 

Before continue further, let's explain the auction on this table. 2 NT rebid of the opener shows 19-22 HCPs with an unbalanced hand. Responder's rebid of 3 Clubs is a relay bid asking the long suit of the opener. After then he may bid game or invite to slam depending the HCPs he holds. If the responder does not have support to the opener's suit, then he may bid his own long suit. In this case, Opener may support or may bid NT. The suit bids by the responder other than 3 Clubs should be accepted as transfer. 

Opener's suit rebids in the third level shows 19-22 HCPs and 4441 distribution in which the higher ranking suit is singleton. If the responder rebids this singleton, it means that the hand is very weak and require the opener to make a relay bid and then pass. In the above table, after 2 Diamonds-2 Hearts-3 Clubs auction sequence, 3 Diamonds rebid of the responder shows a very weak hand, Opener's 3 Hearts is a relay bid and then responder bid his longest suit and the Opener passes.

If the response to 2 Diamonds openning is 2 Spades, only the first two lines change in the above table. Opener passes with a weak 2 Spades hand, and bid 4 Hearts with a weak 2 Hearts hand. The other auctions do not change.

Opener
Responder
Opener
Explanation
Responder
Explanation
Opener
Explanation
2 Diamonds
2 NT
3 Clubs
 
 
 
 
3 Diamonds
 
 
 
 
3 Hearts
3 Spades
3 NT
 
 
4 Clubs
4 Diamonds
Weak 2 Hearts
 
 
 
 
Weak 2 Spades
 
 
 
 
19-22 HCP 1444
19-22 HCP 4441
19-22 unbalanced
 
 
19-22 HCP 4414
19-22 HCP 4144
3 Hearts
 
4 Hearts
Shifting Suit
 
3 Spades
 
4 Spades
Shifting Suit
  •  
    Controls
    Controls
    4 Clubs
     
    Shifting Suit
    Controls
    Controls
  • Invitation
     
    Game
    His long suit
     
    Invitation
     
    Game
    His long suit
     
     
     
    Ask the long
    suit
    His long suit
     
     
    Pass
    4 Hearts
     
    Support or
    NT
    Pass
    4 Spades
     
    Support or
    NT
     
     
    4 Diamond
    4 NT
    Slam bidding
    Minimum
    Game
     
     
     
    Minimum
    Game
     
     
     
     
     
    Uzun Karo
    Uzun Trefl
     

    The suit responses to 2 Diamonds openning other than 2 Hearts or 2 Spades are preemptive, shows long suit and weak hand.

    Overcall disturbs these auction sequences. Double in the second level is Responsive but is penalty in the third level. The other responses should be accepted as natural.

    Double by the first opponent does not disturb the auction.

    Defense to Multi 2 Diamonds

    Multi 2 Diamonds openning should be alerted. Let's look at the overcalls after 2 Diamonds openning at the below table.

    Opener

    2.Opponent

    Explanation

    2 Diamonds
    Double
    2 Hearts
    2 Spades
    2 NT
    3 Clubs
    3 Diamonds
    3 Hearts
    3 Spades
    3 NT
    12-15 HCPs balanced, or 16+ unbalanced
    At least 5 cards of Hearts with openning values
    At least 5 cards of Spades with openning values
    16-18 HCPs balanced
    At least 5 cards of Clubs with openning values
    At least 5 cards of Diamonds with openning values
    Preemptive
    Preemptive
    Gambling 3 NT