18-19 HCPs balanced hand.

No 5 card suits or singletons. 4333 or 4432 distributions only. Bid replaces opening a hand too strong for 1NT in a short minor suit. With a 5 card suit open 1 of the suit and rebid 2NT / 3NT to show strength. This way you will be playing a 1 level contract in your 5 card suit when partner has a bust. After a minor suit opening and any suit response at the 1 level from partner, a 2NT rebid would indicate that the minor suit was 5 cards in length.

Responses are designed to have the strong hand play in most situations:

PASS weak hand with diamond length

2♥ Transfer to spades. Weak, or game forcing with 5 spades.

2♠ automatic

PASS spade length, weak

3♠ 5 spades, game forcing

2♠ relay to 2NT, could be weak hand - indirect transfer to hearts

2NT automatic

PASS to play

3♣ Stayman

3♦ transfer to hearts

3NT to play

4♣ Gerber

2NT weak hand - transfer to clubs

4♦ Texas transfer to hearts

4♥ Texas transfer to spades