Cappelletti defense convention against 1NT opening.
Doubl: Take out. At least as strong as the NT opener.
2C: Undefined long suit. Request partner to bid 2D if he don't have his own good suit.
2D: Both major suits.
2H: 5+heart and a side suit in minor. With a good major suit suit in you may be better off not showing your your side suit. It is often better to play 5-1 at the 2-level than 4-3 at the 3-level..
2S: 5 spade and a side suit in minor. With a good major suit suit in you may be better off not showing your your side suit.
2NT: Both minor suits.
Pass: A lot of clubs and little points.
2D: Request partner to show his side suit. Max 12 HCP.
2H/2S: Own suit. Ca. 8-12 HCP.
2NT: forcing. At least 12 HCP+