I've just listened to a YouTube clip taken by Dr Sternberg where he explains his responses to 2C. So Ace = 2 and King = 1. 2D is 1 or 0 controls; 2H is 2 controls - 1 Ace or 2 Kings and 2S is 3 Controls - 1 Ace and 1 King or 3 Kings. I'm just wondering how much this system is used and if it used, how people find it? I play Acol with my partner at my local club. What I am of course, trying to determine, is whether it would be a good convention for my partner and me to adopt.