| 
    Forcing Notrump - A conventional response of 1 Notrump to 
    partner's major suit opening, requiring further description of opener's 
    hand.  Originally created by Alvin Roth and Tobias Stone and later 
    adapted by Edgar Kaplan and Alfred Sheinwold in their systems, the Forcing Notrump 
    call is a cornerstone of the 2/1 system.  
    The Forcing Notrump  shows a range of 6-12 points.  This treatment is necessary to cover 
    Responder's 10-12 point range, where a two-level bid by responder creates a 
    game forcing response. 
      
        | Bid | Meaning |  
        | 1C/D - 
        1N | Natural, not a forcing bid 
        (minor suit opening bid) |  
        | 1H/S - 1N | Forcing Notrump (major suit 
        opening bid) |  
        | P - 1S;1N - ?
 | Not forcing after a passed 
        hand; many play as semi-forcing  |  
        | 1H - (X) -? | "System off" after a 
        interfering bid |  
    See 2/1 System 
    and the book
        
        Understanding 
        1NT Forcing |