1H

Opener has about 12-16HCP, 7 or fewer losers, 1.5 defensive tricks and biddable Hearts.

Suit openings follow the Canape principle; Diamonds may not be the main suit in the hand.

Responses

Canape principles apply to suit responses, so the first suit named may not be the hand's main suit.

1S
Forcing

Biddable suit, 8+HCP; may not be the main suit.

1NT
8-10HCP; may be slightly shaded with a poor fit for opener and no biddable suit at the 1 level.
2C
Forcing

Biddable suit, 11+HCP; may not be the main suit.

May be slightly shaded with a strong rebiddable suit.

The suit may occasionally be notional (Ax or Kx) in powerful hands with a major.

2D
Forcing

Biddable suit, 11+HCP; may not be the main suit.

May be slightly shaded with a strong rebiddable suit.

The suit may occasionally be notional (Ax or Kx) in powerful hands with a major.

Raise
Direct raises are made according to the losing trick count.
2NT
11-12HCP
Jump Shift
Forcing to Game.

12-13HCP, long solid suit; a major may contain no more then one loser, but a minor may have 1.5 or 2 with compensating values.

Opener should raise on Qx or better, to prepare for cue bidding.

3NT
13-15HCP