In a bidding poll I posted before this hand later in the auction but, I remember reading somewhere early on in learning 2/1 to open this specific combination of two suits 1C with a minimum or maximum hand or 1S on a medium opener. Since then, most people I know just open 1S always, so I thought little of this obscure rule, but the situation the rebid problem at my third call led me to question: Why are these hands opened 1C? Do people actually play this way?
Any advice in comments is appreciated
Plus... it's free!