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As a related note, my view on the weakness of the multi is that it's susceptible to natural overcalls in a minor (which I play roughly as 10-13 with a decent suit). Responder is now apprehensive to make a call if he doesn't have both majors and they may miss an easy game or sometimes a slam. I've seen it happen.
This is the essence of my defense to multi 2
♦, which I insist on playing in any partnership:
X=I have a good overcall in a major and will clarify later in the auction (or I have such a good hand that I can handle whatever comes our way)
2
♥=A good 3
♣ overcall, usually a good 13+ HCP with a good suit
2
♠=A good 3
♦ overcall, usually a good 13+ HCP with a good suit
2NT=15-18 balanced, hopefully with some reasonable holdings in the majors
3
♣/3
♦=natural, with an approximate HCP count in the area of 8-12
Main idea here is that if they're going to try to hurt you, you must try to hurt them back. If you can overcall their multi open with what is essentially a good weak-two, but showing it at three-level, you will often shut out your LHO who is sitting there with his 5-1 in the majors, and no longer has an economical "pass or correct" call available. You can often steal the pot with your 3
♣ overcall, while their 9 or 10 card fit in one of the majors remains undisclosed.
6♠ by south, lead ♥8