Deal 8 ♠  
 
 
♣  
 
 WEST  NORTH  EAST  SOUTH
passpass1♠
pass3♠pass BID 
 

You open in third seat and the bidding continues as shown.
Decide what you would say, then click on BID above.
  ♠ K Q 8 7 5
K 7 4
K Q 7
♣ 10 2
 

 
Deal 8 ♠ J 10 9 6
Q 8
8 6
♣ K 8 6 5 3
 
 WEST  NORTH  EAST  SOUTH
passpass1♠
pass3♠passpass
passpass

If you thought North had 11 points you'd bid 4♠.
But you know he has a weak hand - with 10+ points and support he would have said 2♣.

His 3♠ bid is just preemptive, so you pass.

 To Summary 
  ♠ K Q 8 7 5
K 7 4
K Q 7
♣ 10 2