Demonstration, Part 5

Demonstration, Part 5

N
W   E
 
S
K 8 6 5
A 9 7 3
Q 8 5
6 5

Dealer:

West

W N E S
1 1 Double 3
3 End

If we double showing both 4-card majors, opener is able to compete over South's 3 with 3.