|  Rule of 7 versus Preempt - When an opponent opens preemptively, 
    the Rule of 7 provides the overcaller a guideline on what values to 
    anticipate in partner's hand.  First, the overcaller should have an 
    opening hand or better, with values and length in side suits. In essence, 
    the Rule of 7 (guideline) suggests the overcaller predict an ordinary 7 
    points in advancer's seat - one without controls in specific suits.   
    Using this criteria when advancer makes a minimum response, the overcaller 
    and advancer have a standard criteria to assess forward-going bids.  
    Example: 1.   
    (2D) - X - (P) - ? 2.   
    (2H) - X - (3D) - ? Partner 
    expects advancer to hold a mediocre 7 point hand when responding.  For 
    this illustration, imagine advancer holds: A. A 
    poor 2-5 point hand, flat with no Aces, Kings, or useful features B. A 
    lackluster 6-8 point hand, perhaps with 1 control but no appreciable length C. A 
    good 7-9 point hand, with either 2 controls or 1 control and working length 
      
        |  | (2D) - X - (P) - ? | (2D) - X - (3D) - ? |  
        | Hand A | Minimum response | Pass |  
        | Hand B | Minimum response | Minimum bid (freebid) |  
        | Hand C | Jump, cuebid, or Notrump | Freebid or jump |  Incidentally, 
    the Rule of 7 also applies when Overcaller is faced with a difficult 
    decision whether to enter the auction in direct seat.  While the rule 
    of thumb requires overcaller to have an opening hand with shortness in 
    opponent's suit (except bidding Notrump with stoppers), the astute 
    overcaller may profit by considering the Rule of 7 with lesser values.
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