Standard Blackwood

Standard Blackwood

N
W   E
 
S
A Q 4 3
A K Q J
A 8 7 3
6

Dealer:

West

W N E S
1NT Pass 2 Pass
2 Pass 4NT Pass
5 Pass ?

Here is a typical example of where standard Blackwood doesn't quite give us the information we require.

Partner has opened 1NT and we have 20 points and both majors. We use Stayman and find partner with four spades. We want to be in a slam if she has either A or K.