IMO,two pards just like two hands,usually we bid them in "natural system".It's hard to bid precisely,ie,the bidding skill in "natural system" might decide the two pards' cooperative relationship. what do you think about my opinion?
Jahol,IMO,you should be blamed for the missed slam bidding. I agree with your pd completely: The key to the slam is control(s) of Di,especially after opp's competitive 2D. It's obvious!