The Multi 2 Diamond Convention. (see next page for Defence!)
This convention is an alternative to playing weak 2 bids - eg Benji or Reverse Benji.
2C is still an Acol strong 2 bid 23+ or equivalent.
2H/2S are still stong bids as in Acol but the 2D bid is used for a variety of hands including weak 2 bids in the majors.
With about 5 to 9 points and a 6 card major you open 2D and partner (unless they have a strong hand or a good fit for hearts or hearts and spades) simply bids a relay of 2H. If opener has a weak 2 in hearts they pass or convert to 2 spades if their suit is spades.
We use the alternatives for:
a) 19-20 2 Notrump hand, when we rebid 2NT (We define our opening 2 NT as 21 - 22 which helps partner to decide whether to raise 2NT to 3 NT holding poor hands of 3 or 4 points)
b) very strong hands in the minors with a possible 9 tricks but where you are not strong enough to open 2C.
Over the 2H relay, opener bids 2NT with 19/20 balanced (may contain a 5 card major or a singleton honour) and then we play 5 card stayman.
Over the 2H relay we bid 3C or 3D with the big minor suit hands. These hands are often played in 3NT. Responder will bid their 4 card major or 3 NT without one. With a fit for the minor and good controls responded may raise to 4 or jump cue bid.
The more complicated situations arise when responder has a strong hand. We play that 2NT shows about 15 points and is an enquiry bid. Opener bids 3C with hearts, 3D with spades, 3 hearts with clubs and 3 spades with diamonds. (Sounds confusing but is logical!)
Over 3C or 3D responder can ask 'how strong? ' by bidding next suit up - opener bids at minimum level with 5-7 points and one up with 8-9. Responder always has the choive of playing in 3NT or 4 of the major.
eg
2D - 2NT
3D (spades) - 3H (how strong?)
3NT (8-9 points) - Pass or 4Spades
(note declarer is the strong hand)
There are 3 other situations which give rise to different bids.
c) If you have about 13 points and 4 hearts game may be on if opener had a weak 2 in hearts - so bid 2S! If they actually had spades they simply pass but with a weak 2 in hearts they can bid 3 or 4 hearts as apprpriate (this bid makes it very difficult for the 4th in hand if they have spades!)
d) If you have about 13 points and a fit for both majors, then game in either may be on if opener has a maximum - so bid 3H - opener can bid 3 or 4 H or 3 or 4 S as appropriate.
e) Sometimes you have a hand that wants to be in 4 of either major even if partner has a minimum - so bid 4H - partner will convert to spades if necessary. We have found that you need to be very careful with this bid in case partner has a strong hand! We play that it guarantees 11 points so that there is a reasonable play for a slam opposite a 19-20 2NT hand.
You may ask why play it! Firstly it keeps 2H and 2S as strong bids like in Acol but you can still open weak 2s in the majors. Secondly it helps to define the NT bids:
12 - 14 open 1NT, 15 - 16 open one of suit and rebid 1NT, 17-18 rebid 2NT, 19 -20 open 2D and rebid 2NT, 21-22 open 2NT.
It also makes it confusing for the opposition to compete.
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