Deal 5 ♠  
 
 
♣  
 
 WEST  NORTH  EAST  SOUTH
pass
pass1pass BID 
 

The bidding has gone as shown.
Decide what you would say, then click on BID above.
  ♠ 7
Q 9 8 6 4
10 7 4 3
♣ K 8 3
 

 
Deal 5 ♠ Q 8 4
A K J 5 3
8 2
♣ A 7 4
 
 WEST  NORTH  EAST  SOUTH
pass
pass1pass3
passpasspass

You like partner's suit but you have very little defensive strength. This is a good hand to preempt the bidding, trying to keep them from finding a ♠ fit.

So you jump to 3. Partner realizes you don't have any strength since you did not invoke Reverse Drury. He passes and you have bought the contract. It appears that their side might be able to make 4♠.

 Deal 6 
  ♠ 7
Q 9 8 6 4
10 7 4 3
♣ K 8 3