All 1 level openings 11-14
All 2 level openings except 2♣ usual weak 2's
1NT 15-18 any shape at all
2NT 19-22 any shape at all
3NT 23+ any shape at all
So what to do with 2♣? Well, if the wind is blowing in the right direction and I have a middling hand with some diamonds I might try 2♣. Otherwise - Not used.
Today I get this hand. going 3NT-1 for 61.1% at the moment.
Here's the link
Here's the double dummy
I was tempted briefly by 4♥ but with what looked like 4 losers and the notoriously unreliable North robot as a partner I decided against it. The West robot is a much more advanced player and led the ♥2, which his junior colleague sitting East was very satisfied with. Of course the rest of the tournament looks like the usual car crash.
In case you're wondering, the explanation for "3NT" is 2-5♠, 2-5♦, 2-4♥, 2-4♣ and 10-15 HCP!