The bidding starts with a weak 2♠ opening from LHO. Your partner then doubles for take-out. We have already seen the value of Lebensohl Responses, where a 2NT response asks partner to rebid 3♣ on most hands. You can then pass with 0-7 HCP and clubs, or show the same range with a different suit by rebidding 3♦ or 3♥. A direct response at the three-level would have shown 8-10.
Now we will look at some strong sequences that can flow from a 2NT Lebensohl start. There are four possible game-going types that the responder can hold: Game values with/without a stopper in spades, and with/without four cards in hearts, the other major. Amazingly, there is space to show all four types:
2NT then 3NT shows a spade stopper, but not four hearts
2NT then 3♠ (cue-bid) shows a spade stopper and four hearts
3♠ directly shows NO spade stopper, with four hearts
3NT directly shows NO spade stopper and not four hearts
It's complicated, yes, but just look at how much partner will know about your hand! He will easily be able to place the final contract.
See how it works in the following quiz.