In a team match, you find yourself in 3NT instead of the much-preferred 4♥ (the less said about the auction that got you to 3NT, the better). No opposing bidding, competent opponents. You get the lead of the ♠4 (4th best), plan the play. Without using Deep Finesse or other similar software, and ignoring the "obvious" possibilities of either opponent having a stiff ♥A or ♣K, specify what layout(s), if any, would give you (at least) 9 tricks against best defense and be specific about your line of play for them.
Benefits include:
Plus... it's free!