Deal 9
 
 
 
♠ A 9 7 4 2
A 9 8 3
K 6
♣ Q 7
 
 WEST  NORTH  EAST  SOUTH
1♠pass2♣
pass2pass3
pass3NTpasspass
pass

North opens 1♠, his 5-card Major.
South, with 14 points, responds 2♣, a 2/1 force to game.

North next bids 2, showing the other Major suit.

South assumes North to be 5-4 in the Majors, so she cannot support either. She cannot bid 2NT without a stopper in s. So South bids the fourth suit, 3, telling North she knows she must make a bid, but can't find anything appropriate.

North now must find a bid. His choices include rebidding the 5-card ♠s, supporting South's ♣s with a doubleton Queen, or bidding 3NT with the K 6 as a stopper. He chooses this last option. It appears that 3NT is the best game for these two hands.

 Deal 10 
  ♠ K 8
J 10 7
9 7 5
♣ A K J 6 2