Pre-emptive Opening bids 3
Previous Deal - Bidding Guide - Next Deal
NS Vulnerable
West *
- K 9 5
- K Q 9 8 5 3 2
- 7 5
- 6
Next
East
- A 6 3 2
- J 10 6 4
-
- 10 8 7 4 2
 
W N E S
4♥ 5♦ 5♥* DBL
Pass -    
       
 
* = 10 - 3 = 7 tricks     # = 3 tricks, including 2 for the void + trump support

It is much better to make a "sacrife bid" going down 1, 2 or even 3 tricks doubled (100, 300 or 500 pts) than letting NS make a Vulnerable Game contract (= 600 pts).
In this case EW will easily make 10 tricks, going down 1 only.