The Multi-2♦ includes the Weak Two opening bids of 2♥ and 2♠ plus the strong 2NT (21-22 pts). This makes the 2♥, 2♠ and 2NT bids available for other use.

These three Opening bids can be used for weak 5-5+ suited hands of

6-10 HCP : weak in High Card Points

6-7 losers : powerful in shape (in rare cases only 5 losers)

The Honour cards must be located within the two long suits.

Opening bids are as follow :

2♥    = Hearts and a minor suit (♣ or ♦)

2♠    = Spades and a minor suit (♣ and ♦)

2NT = Both minors (♣ and ♦)   or   both majors (♥ and ♠)

WEAK Responses with 0-11 HCP
Either Pass or make a "Pass or Correct" bid

2♥     →   bid 3♣ (= "Pass or Correct" bid) or Pass

2♠     →   bid 3♣ (= "Pass or Correct" bid) or Pass

2NT   →   Do not pass, bid 3♦ or 3♥ or 3♠ (= "Pass or Correct")
When required : Opener will correct to the lower ranking of his 2 suits

STRONG Responses with 12+HCP and ♥ or ♠ trump support :

Invite Game with 8 losers : 2♥ - 3♥ or 2♠ - 3♠

Bid Game with 7 losers : 2♥ - 4♥ or 2♠ - 4♠

Explore Slam with 6 or less losers : 2NT (= Strong Enquiry)

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STRONG ENQUIRY with 12+HCP but without major suit trump support.

1. Strong Enquiry after a 2♥ or 2♠ Opening (which includes a minor suit)
   2♥ or 2♠ - 2NT (Strong Enquiry) → ?
   3♣ = 2nd suit is ♣, minimum 6-7 HCP (7 losers)
   3♦  = 2nd suit is ♦, minimum 6-7 HCP (7 losers)

   3♥ = 2nd suit is ♣, maximum 8-10 HCP (6 losers)
   3♠ = 2nd suit is ♦, maximum 8-10 HCP (6 losers)

   Strong Enquiry after 2NT, showing either both minors or both majors
   2NT - 3♣ (Strong Enquiry) → ?

   3♦ = minimum 6-7 HCP, with both minor suits

   3♥ = minimum 6-7 HCP, with both major suits

   3♠ = maximum 8-10 HCP, with both major suits

   3NT = maximum 8-10 HCP, with both minor suits