Ah, I know the Dixon defence against the multi. I think it is not a very good defence, mostly because the 2
♥/2
♠ overcalls are takeout of the other suit, instead of 5(+) of the suit bid. In particular, bidding on a 4-card suit is not too uncommon. My favourite defence is not all that complicated:
(2
♦* Multi showing a weak major suit, I don't care if it can be a 5-card suit, I don't care that there might be strong options):
- Pass: Weak/Some specific hands that will enter the auction next round
- Double: 13-15 (semi)balanced or any very strong hand (approx 17+), 'train the guns' double.
- 2♥: Opening strength and 5(+) hearts.
- 2♠: Decent opening strength and 5(+) spades.
- 2NT: 16-19 (semi)balanced, does not promise stoppers in both major suits.
- 3♣/♦: A good opening with usually 6(+) in the suit bid, can be a 5-card suit with compensation in a pinch.
If you want to go scientific the direct leaps to 4m should show that minor and hearts (with the minor and spades pass first, enter the auction the second round) in both second and fourth seat, and you can use the 3M bids any way you please.
However, the most important piece of advice that I have when defending against the multi is to be more aggressive. Over a multi 2
♦ it takes a while for the opponents to get going - their fit hasn't been established, and some partnerships are all too scared of preempting their own strong auction. The bid is less specific than a weak two, and leaves responder in a worse position. So there is more to gain and a lower risk to bidding than you'd normally expect, both of which recommend being aggressive. Knock a queen off of your normal expected strength and make a natural bid, and your partner will be captain of the auction.
I'm not at all a fan of waiting a round with a decent two-suiter, especially not if the opening bid was a 'measly' multi instead of a descriptive weak two. The fact that the example hand has got hearts, not spades, makes bidding automatic. Double to show diamonds is, in my opinion, also not that great (the intermediate semibalanced hands are much more common, difficult to bid otherwise and help establish that it is our board).
For what it's worth, I play (2
♦*)-P-(2
♥*)-P; (2
♠)-X as takeout of spades (and some other auctions are analogous). Of course this doesn't make sense if you play Dixon defence - the double should probably be penalty in that case!