As West, you hold:
RHO opens 1. You pass and LHO uses Jacoby 2NT (GF 4-card raise) and RHO jumps to 4 as shown below (flat minimum).
What is your opening lead?
The first trick is shown below. Assume standard signals.
Next, declarer leads a low heart as shown below. And you?
Win the A
The Q wins (partner playing low). Another heart is led as shown below. And you?
Let declarer win.
Win the A and play more spades.
Win the A and play your last trump.
Win the A and switch to diamonds.
Win the A and switch to clubs.
This is the position when you switch to the 9: