Basic Concepts vs. Artificial Preempts

      Direct double of a bid below 2NT shows 13-15 (balanced or semi-balanced) or a strong hand. Any other double which is your side's first non-pass call is for takeout. After an overcall when their suit is unknown, bidding the cheaper minor is an artificial force (like a cuebid). If the preempt could be either strong or weak, assume the weak meaning.