Deal 10 ♠  
 
 
♣  
 
 WEST  NORTH  EAST  SOUTH
2NTpass BID 
 
 
 

North opens 2NT showing a balanced 20-21 point hand.
What do you respond?
  ♠ 7 5
K Q 8 7 4
10 9 3
♣ 8 7 4
 

 
Deal 10 ♠  
 
 
♣  
 
 WEST  NORTH  EAST  SOUTH
2NTpass3
pass3pass BID 
 
 

Jacoby Transfers work fine with 2NT openings also.
You should bid 3 as a transfer to s.
Partner complies by saying 3. What do you say now?
  ♠ 7 5
K Q 8 7 4
10 9 3
♣ 8 7 4
 

 
Deal 10 ♠ Q 2
A J 3
A K 6 4
♣ K Q J 10
 
 WEST  NORTH  EAST  SOUTH
2NTpass
pass3pass3NT
pass4passpass
pass

You bid 3NT which tells partner you have just 5 s and lets him decide on which game to play.

On this Deal partner has 3 s so he bids on to 4.

Notice that when partner opens 2NT the invitation to game option is no longer available. As responder you must decide immediately whether to stop short of game (by transferring then passing) or to go to game. This is not a serious problem since the tighter (20-21) point range makes responder's decision easier to make.


 Deal 11 
  ♠ 7 5
K Q 8 7 4
10 9 3
♣ 8 7 4