This article was taken from Andrew's What Should Have Happened Book
If the opponents have bid to a high-level contract and you have a surprisingly large number of points, they are probably planning to make tricks by trumping rather than with high cards. Take out two of their trumps by leading a trump.
| 
						South Deals E-W Vul  | 
					
						♠ 10 9 4 3 ♥ A 6 4 2 ♦ — ♣ A Q 10 8 4  | 
				||||||||||
| 
						 
							♠ K Q 2 
					♥ K J 7 5 ♦ A J 2 ♣ 6 3 2  | 
					
						
  | 
					
						 
							♠ 7 6 5 
					♥ 10 9 8 3 ♦ K 9 6 5 4 ♣ 7  | 
				|||||||||
| 
						♠ A J 8 ♥ Q ♦ Q 10 8 7 3 ♣ K J 9 5  | 
				|||||||||||
| West | North | East | South | 
| 1 ♦ | |||
| Pass | 1 ♥ | Pass | 2 ♣ | 
| Pass | 5 ♣ | Pass | Pass | 
| Pass | 
| 5 ♣ by South | 
West was correct to pass over 1♦ - to overcall 1NT would show 15-18 points and to overcall 1♥ would guarantee five cards. Against 5♣ it might appear attractive for him to lead ♠K - a sequence in the unbid suit. Had he done so declarer would win ♠A, play ♥Q to ♥A, trump ♥2 and lead ♠J. Assume West wins with ♠Q and switches to ♣2. Declarer wins with dummy’s ♣10, trumps a third ♥, leads ♠8 to dummy’s ♠9, and trumps dummy’s last ♥. He trumps a ♦, draws West’s remaining trumps and makes his twelfth trick with ♠10.
It is a different story on a trump lead. Declarer wins in dummy and leads ♠3 to ♠J. West wins ♠Q and plays a second trump. Declarer wins in dummy and plays ♠4 to ♠8. West wins ♠K and plays his last trump. Declarer can only trump one ♥ in his hand and makes 2♠s, ♥A and six trump tricks - two down.
ANDREW’S TIP: As a defender, lead a trump when you have a surprisingly good hand.
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