The Duck - Deal 7
Previous Deal - Home - Next Deal

Bidding: : (W) 1NT - 3NT - Pass     Lead : 4♥

Trick 7 North
9♥
 
Declarer (W)
♠ A 5 - -
♥ - - 7
♦ - -

♣ A K 5 -
4♠     3♦   Dummy (E)
♠ Q 6 2
♥ - -
♦ - - - - - 2

♣ 7 6
    7♠
South
  Won = 6
Lost = 1

Previous - Next

Running Dummy's s generates pressure on NS as to what to discard.   North already has to discard a winner here !
Declarer is keeping his 7♥, forcing North to also keep one in his hand to cover that.