I am dipping into How to Play Card Combinations by Mike Lawrence. There is a nice lesson in visualizing possibilities from his 1st hand:
The play looks easy if West is leading from a 4-card suit. You will drive out the two top clubs and make nine tricks.
But what if West is leading from a 5-card suit? That would mean East started with two spades. If so, what is the danger and how should you play the spades? You have two sure spade stoppers (right?), and you don’t want West to get in once they are exhausted. Say you win the opening lead in dummy and start the clubs. East wins and returns a spade to West’s queen. West then plays another spade, setting up his two remaining spades. You are safe if East started with the ace, king of clubs, but you are going down if West has one top club honor. How about the possibility that West started with the two top club honors? West would have opened the bidding with A,K of clubs the K,Q five times of spades. Your worry is the real possibility that West started with one of the top club honors.
If you duck the opening lead, you will still have two spades stoppers. After the second spade, East will not be able to hurt you when he gets in with a top club. When you work all that out you duck the opening lead!
Here is the entire hand:
