Discards Even McKinney
2D/2H/ 2S a good 5 if not 6 card suit
2NT both minors 5/4 at least
After a weak 2 opening,
1. X is for takeout. If you have <8 points you say 2NT and I know not to go too high: I reply
3C always and you correct to your best suit if necessay.
So 2S X P 3C/D/H promises 8+ points
2. 2NT says 16+ points and a good stopper
3. 2S 3S asks you for a stopper in their Ss - if so bid 3NT