It's often a good idea for declarer to immediately draw trumps but
sometimes that has to wait. Here is a good example.
Scoring: Matchpoints
Hand #9
Dlr
N
Vul
E-W
K10865
J7
AK5
AQ4
AQJ42
AK1092
K109
97
653
J9732
J82
3
Q84
Q10864
7653
West
North
East
South
1
Pass
Pass
2
DBL
Pass
3
All Pass
BIDDING: My partner in the North chair opened 1 but holding
only four hcp I passed. With so many spades it was dangerous for
West to enter the bidding but he didn't want the auction to die at the one
level. My partner held extra values with support for the other
two suits so he doubled asking me to bid. My 3 bid
closed the auction.
PLAY: West played the top two heart honors followed by a
third round. I discarded a club from dummy and won with the queen
in my hand. It seemed likely that most of the outstanding high
cards would be in the West hand so I led a spade toward dummy.
West rose with the ace and exited with another spade. I won the
king in dummy discarding a club from my hand. Next I ruffed a
spade in my hand as East discarded a club. This meant West had
started with ten major suit cards and East was very likely to hold a
lot of trumps. I then led a club to dummy's queen followed by the
ace. I then led another spade and East, now down to nothing but
trumps, played one in front of me. I over trumped and ruffed my
last club with dummy's ace as East helplessly under-ruffed again.
I then played the king of diamonds and watched West show out. My
last two cards were the Q10 of diamonds and East was finished. He
started with five trumps and never scored a trick. Making four
earned all of the matchpoints. It's clear that leading trumps
early would have been a bad idea.
Also note that perhaps West would have been better off passing 1.