|      Box R1B    
 (Version 1.0)   
 |      Responding to 1NT    
 | 
|    Bid  
 |    Meaning  
 |    Forcing?  
 |    Where to next?  
 | 
|    Pass  
 |   0-8 HCP, five clubs or fewer, five diamonds or fewer, no 5+ holding in hearts or spades
 |   NF 
 |    
 | 
|    2♣  
 |  1NT:2♣ is 3-card Redshift, requesting the 1NT bidder to reply with his cheapest 3+ card suit — i.e. 2♦ or 2♥.  Responder has one of:
-  6+ club suit and a weak hand (i.e. 0-9 HCP), planning to bid 3♣ on the next round whatever opener replies. (K1#4)
 -  Weak hand (i.e. 0-9 HCP) and 5-card heart suit, when he passes 1NT bidder's 2♥ or bids 2♥ after 1NT bidder's 2♦.
 -  Weak hand (i.e. 0-9 HCP) and 5-card spade suit, when he rebids 2♠.
 -  Balanced or semi-balanced hand containing 10-11 points, when he will rebid 2NT. (R3#3)
 -  Good hand (i.e. 10-13 HCP) and 5+ card suit in ♦, ♥ or ♠. He will rebid the suit at the 3-level whatever Opener responds. (K1#3) 
 -  Very good hand (i.e. 14-16 HCP) and a 5+ card suit. He will rebid the suit at the 4-level whatever Opener responds.
 -  Or exceptionally, Weak hand (i.e. 0-9 HCP), at least four cards in each red suit, and a shortage in spades (i.e. either a singleton or void), when he will pass whatever the 1NT bidder replies, preferring to play in, at worst, a 4-3 trump fit rather than NT with a spade shortage.
  
 |   F 
 |    
 | 
|     2♦ / 2♥ / 2♠  
 |  Weak (0-10 points) and a 6+ diamond/heart/spade suit.
 |   NF 
 |    
 | 
|    2NT  
 |  12-14 points, balanced or semi-balanced, no 4+ card major, stopper in the enemy suit (if they have bid).
 |   NF 
 |    
 | 
|    3♣ / 3♦ / 3♥ / 3♠  
 |   17-22 points and cheapest 4+ card suit.
 |   NF 
 |    
 | 
|   3NT 
 |   15-16 points, balanced, probably no 4+ card major, stopper in the enemy suit (if they have bid).
 |   NF 
 |    
 | 
|   4NT 
 |   19-20 points, balanced. Quantitative inquiry. Opener:
-  passes on 11-12 HCP,
 -  bids 5NT on 13-14 HCP, and
 -  bids 6NT on 15-16 HCP 
  
 |   NF 
 |    
 |