When defending you must stay alert and be aware of declarer's game
plan. If not, you could allow a bad contract to succeed.
Take a look at this one.
Scoring: Matchpoints
Hand #51
Dlr
N
Vul
E-W
876
AJ
AQ73
AJ32
KQ1094
Q1083
J4
Q9
A2
K97642
K1092
8
J53
5
865
K107654
West
North
East
South
1NT
Pass
3*
All Pass
*Weak
BIDDING: My partner in
the North chair opened 1NT and I bid 3 to show a weak hand with a long
suit. The opponents wanted to enter the auction but the
unfavorable vulnerability scared them off. Note they can make 4.
PLAY: West led the king of spades and East overtook with
the ace to play a second one. West captured the second and third
round of spades and after seeing East's encouraging signal of the heart
9, switched to a low heart. I had lost three tricks and still had
two possible diamond losers. I rose
with the ace of hearts and drew trumps in two rounds. I then
ruffed dummy's last heart to my hand to lead a low diamond. West
played the four and I let my five run around to East. He won the
trick but was end played. He must return a diamond into the AQ or
give me a sluff and a ruff to discard the other losing diamond from my
hand.
I'm sure you have noticed that West erred by not playing his jack of
diamonds on my five. He knew I had no more spades or hearts so
his partner would be in bad shape after winning the first
diamond. The play of the jack leaves me with two diamond losers
and I'm down one. If I held the diamond nine or ten in either
hand, the end play could not be prevented. Those spot cards are
important. Also note that East must hope his partner holds the
heart queen and duck when the jack
is led from dummy. If he plays the king, he will be end-played
into
returning a diamond or concede a ruff/sluff. Defense is not easy.