Question:

We are responder. Partner opens 1. We bid 1NT (which, in our system, is "semi-forcing"). Opener rebids 2. What is our next call (the auction is 1--1NT--2 with the opponents silent) with:

2
A1087
K1087
K765?

Answer:

3. Natural, invitational. One of the benefits of Semi-Forcing 1NT is that we know partner has at least four clubs. Partner could still have 16 or 17 HCP.