Playhand 17

Board 17
South Deals
E-W Vul
Q 7 3 2
K 9 8 4
8 5 4
J 6
10
7 6
Q J 9 2
A K Q 8 5 3
N
W E
S
J 9 8
Q J 10 3 2
10 7 6
9 2
 
A K 6 5 4
A 5
A K 3
10 7 4

East passes and South bids 1 , which is overcalled 2 by West.. North then bis 2 , and South with 18pts bid 4 ♠, the final contract

West starts wth 3 rounds of s. Make 10 tricks

The trap is to ruff the 3rd round of s, where you maybe over-ruffed or promote a trump trick for the defence. Instead throw a from dummy , a loser on loser play. After that you can make the remaining 10 tricks