Multi 2D (Two Diamonds)

A Multi-colored 2 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 2 opening:

KQ7652 A5 876 94

5 AJ8752 J83 T92

AK93 AQ76 5 AJ82

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 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.

		Opener			Responder
		64			QT973
		KQT852			A3
		K75			J97
		J5			K83
		Opener 2 (1) Pass			Responder 2 (2)

1. Multi.
2. Pass or correct.

		Opener			Responder
		765			A
		KJ8642			AQ5
		K75			AT2
		9			T87653
		Opener 2 (1) 3 (3)			Responder 2 (2) 4 (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 4 with a maximum.
4. Signoff.

		Opener			Responder
		AJT832			K76
		5			AJ74
		Q983			AT5
		Q7			AJ2
		Opener 2 (1) 3 (3)			Responder 2NT (2) 4 (4)

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

The Multi 2 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.