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

  1. A weak two-bid in hearts
  2. A weak two-bid in spades
  3. Any 4-4-4-1 shape with 17-24 HCP

Opener will hold a weak-two the vast majority of the time. While the convention originated in the 1970s, it's worth mentioning that many players nowadays use Multi only with a weak-two. Assuming you play it as originally designed, here are examples of hands suitable for a Multi 2D opening:

SKQ7652
HA5
D876
C94
     S5
HAJ8752
DJ83
CT92
     SAK93
HAQ76
D5
CAJ82


Responses to 2D

Responder's bids are as follows.

Response Meaning
2 Weak hand, does not promise heart support. Opener can rebid 2 with a weak-two in spades.
2 Invites game in hearts if that is opener's suit, but signoff if opener's suit is spades. Opener can rebid 3 (signoff), 4 (signoff), or Pass with spades.
2NT Strong and artificial (see below).
3 7+ clubs, signoff.
3 7+ diamonds, signoff.
3 Invites game in spades, if that is opener's suit. Opener can rebid 3 (signoff), 4 (signoff), or Pass with hearts.
4 Strong clubs with support for both majors.
4 Strong diamonds with support for both majors.


Opener's Rebids

Opener's rebids over the artificial 2NT inquiry are as follows.

Opener's Rebid Meaning
3 Weak two-bid in hearts, good hand.
3 Weak two-bid in spades, good hand.
3 Weak two-bid in hearts, bad hand.
3 Weak two-bid in spades, bad hand.
3NT Strong three-suited hand (17-24 HCP) with a singleton club.
4 Strong three-suited hand (17-24 HCP) with a singleton diamond.
4 Strong three-suited hand (17-24 HCP) with a singleton heart.
4 Strong three-suited hand (17-24 HCP) with a singleton spade.


If responder makes an original signoff bid, any strange-sounding rebid by opener shows the strong three-suited hand.


Examples

OpenerResponder
64SQT973
HKQT852A3
DK75J97
CJ5K83

Opener
2D (1)
Pass

Responder
2H (2)

  1. Multi.
  2. Pass or correct.


OpenerResponder
765SA
HKJ8642AQ5
DK75AT2
C9T87653

Opener
2D (1)
3H (3)

Responder
2S (2)
4H (4)

  1. Multi.
  2. Signoff if partner's suit is spades, but interested in game if partner holds hearts.
  3. Correcting to hearts. Note that opener should rebid 4H with a maximum.
  4. Signoff.


OpenerResponder
AJT832SK76
H5AJ74
DQ983AT5
CQ7AJ2

Opener
2D (1)
3D (3)

Responder
2NT (2)
4S (4)

  1. Multi.
  2. Strong and artificial, forcing.
  3. A weak-two in spades, maximum strength (around 8-10 points).
  4. Signoff.


Origins

The Multi 2D is attributed to the late English expert Terence Reese circa 1970. However, as Mark Horton and Jan van Cleef note in their book "The Mysterious Multi", Reese may have been inspired by Irish player John Grummit, who created a multi-purpose convention named the "Hollywood Two Diamonds" several years earlier.

See also

  • Ekren 2
    A weak 2 opening bid showing 4-4 or longer in hearts and spades.

  • Fighting Irish 2
    A weak 2 opening bid showing 4-3 or 4-4 in the majors.

  • Flannery 2
    An artificial 2 opening bid showing 5-4 in hearts and spades and minimum strength.

  • Muiderberg Two Bids
    Weak 2H/S openers that show a 5-card major with a minor side suit.

  • Defense to Multi (Option 1)
    An ACBL defense to Multi.

  • Defense to Multi (Option 2)
    Another ACBL defense to Multi.

  • Precision 2
    An artificial 2 opening bid from the Precision bidding system, showing a 3-suited hand with minimum strength.

  • Roman 2
    An artificial 2 opening bid from the Italian Blue Team bidding system, showing a strong 3-suited hand.

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