My partner and i came up with a new conenvtion when we we're drinking so its not perfect yet: 2♣ = weak with ♥, weak 2 suiter with ♥ or semi forcing + with ♥ 2♦ = weak with ♠, weak 2 suiter with ♠ or semi forcing + with ♠ 2♥ = bad preempt in ♣, weak with minors or GF with clubs 2 ♠ = bad preempt in ♦, gf with ♦ or some strong NT We only play this for fun and only tried it at one serious tournament. But it got us some good scores :). When we open 2♣ opps never ask what it means cause they think its semi forcing + opening. And last time one opponent overcalled 2H with AQ109x because he didnt ask. After i doubled and my partner converted it to a penalty double he asked what it is. You should have seen his face :D