Opening lead: J

North's 2 cuebid shows a hand without four spades and game interest.
South should bid 2NT with a heart stopper. North's cuebid doesn't show
a stopper or deny one; it simply asks partner to bid notrump if he has one.

If North bids notrump first, East leads a heart first and the defenders
have the advantage. It's much better to put West on lead, since he must
lead away from his heart strength. South wins the heart lead with the king
and leads a heart back, setting up the queen. He scores nine easy tricks:
one spade, two hearts, one diamond and five clubs.