I had 15 points and was planning to re-bid 1NT. I opened 1 Diamond, my partner bid 1 Spade then RHO over-called 2 clubs. I did have one stopper in Clubs but felt I could not bid 2NT as this would show 17-18 points. I repeated my Diamonds which made but 5 others were all in 3NT which made 10 & 11. The RHO 2 Club over-call bid was made at other tables when we discussed after the session had ended and those that bid 2NT thought that this still showed 15 to 16 just as it would if my partner had bid 2 clubs and I bid 2NT.