I don't think there is any problem here with either 1
♣ or 2
♣. If this kind of hand opens 1
♣ then presumably you use some kind of gadget to describe it later. For example
gwnn, on 2012-January-12, 03:52, said:
1m-1M; 3NT is instead a quite good hand, but it is not usually taken as a solid suit, but rather semi-solid. It just means that you expect to make 3NT based on running your minor either with a little help from your partner or by finessing for that one missing card. You do not need to have all the other suits well stopped but you should have reasonable chances that combined with a minimum responder you have a good game. I.e. maybe you have JTx somewhere - fine, if partner brings anything, then you're OK.
is obviously one possibility. On the other hand you could choose to play a 3NT rebid as showing a big one-suited hand, too strong for a 3 level rebid but not worth a 2
♣ opening
in your style.
The same goes for the auction 1m - 1M; 4m. Traditionally, in Acol land at least, this shows what Vampyr suggested, a hand with a long minor that was improved by having support for Responder's suit. I know a few people who have dropped this meaning and play it as something like a 4m preempt with opening values. There are a couple other options around too. Whichever way this is played, this hand does not seem to qualify.
Outside of such special methods I suspect the percentage bid is 2
♣ because it just makes it simpler to show the power of the hand. One thing that might help with later bidding after a 2
♣ opening is to use a 2
♦ response as "waiting" but also a 2
♥ response as a double negative. This alleviates the need for adding double negatives into the 2
♦ auctions. For example, you could play bluecalm's scheme but with 2
♥ as the double negative and 2NT as the heart positive. Other "tricks" that can be helpful after a 2
♣ opening (in general, not on this hand) are Kokish (2
♣ - 2
♦; 2
♥ = hearts or big balanced) and using jumps to 3M after a 2
♦ response to show diamonds plus the major (ie 2
♣ - 2
♦; 3
♦ = diamonds and no major...2
♣ - 2
♦; 3
♥ = 4+ hearts, longer diamonds... 2
♣ - 2
♦; 3
♠ = 4+ spades, longer diamonds).
A couple of final options. If I remember rightly Ben plays his multi 2
♦ opening to include a minor 1-suiter with 9.5 tricks and 5+ controls. Not sure if this would qualify for him but it surely would be a possibility for a.n.other copying his system. And, of course, if playing a strong club/diamond system it's a no-brainer to open this 1
♣/1
♦ - just expect the tray to come back to you somewhere in the stratosphere...