Take the West hand for Board 2 of the Opening Leads Lesson:
We'll start you off with an easy one. South opens 1NT (15-17) and it is your call:
2 (conventionally hearts and a minor)
2 (conventionally diamonds and a major)
North raises to 3NT and everyone passes.
What is your opening lead?
This is the full deal. Since we as the teachers get to set it up, you can see that anything but a heart lead is no good.
With the heart lead, what do you think will happen?
Declarer will have only 1 heart stopper and after he takes the losing diamond finesse, he will be down 1.
Declarer will have 2 heart stoppers and make the contract easily, possibly with overtricks.
Declarer will have only 1 heart stopper but can make the contract anyway.