Sometimes the Declarer has options on the first trick; to win or to lose it. Often it is in the Declarer's best interest not to win the first trick but to hold up and sever defensive communications. Other times Declarer can win the first trik with a higher card then is necessary. But why should any sane player do this? Answer: to set up a Bridge Sting. In example 1 on the right Declarer is playing in 3 No Trump.
SCENARIO 1: West leads the 4 
which
Declarer wins with the Q .
To make this hand Declarer gets to Dummy with a Diamond and takes the
Club
finesse. It loses to West's King, who now sees no future in the Spade
suit.
If partner had the A
he would have played it on the first trick. And those Clubs in Dummy
look
like winners. Where to get 4 tricks quickly? West returns a Heart. Down
1.
SCENARIO 2: Declarer wins the
first trick
with the A ;
gets to Dummy with a high Diamond; and takes the Club finesse. Again it
loses to West's King. This time West figures that his partner has the Q
(for why would anyone win with the Ace, when they could win with the
Queen.)
The trap is set; West returns a Spade. Result: 5 Clubs, 4 Diamonds, and
2 Spades, making 3 No Trump with 2
over tricks.
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DUMMY
8 7 
5 3 
A Q 8  Q
J 10 6 4 3
A Q 5
J 8 2
K J 9 2
A 9 5 |