You can decide for yourself whether West had what he was supposed to, but indulging in such bids when the opponents will probably buy the contract may backfire: You may assist declarer’s play.

North-South brushed aside West’s bid and got to six hearts. When West led a spade, South won with the king and drew trumps. He had 11 tricks -- five trumps, three spades, a spade ruff and the A-K of diamonds -- but was sure that trying for a 12th trick by leading a club to his king or finessing in diamonds would fail. So South took the queen and ace of spades, ruffed dummy’s last spade and cashed three more trumps.

After nine tricks, dummy had two diamonds and two clubs, and declarer kept the A-K-J of diamonds and king of clubs. West was squeezed. If he bared his ace of clubs to keep Q-10-9 in diamonds, South would exit with a club to end-play him; when West actually saved two diamonds and two clubs, South cashed his A-K of diamonds; his jack won the 12th trick.

West might say he was unlucky, but his 2NT spilled the beans. If he passes quietly, North-South may reach six hearts, but whether South will make it is uncertain.