Developments after opener shows 6-card major

After 1H > 1S > 2H,

Bid	Meaning
2S	6-10, 5 spades and 0-1 heart
2NT	6-11, 4 spades and 1 heart
3C (!!)	9-12, 4 spades and 0 heart
3D (!!)	10-12, 3+ hearts
3H	Invite to game with exactly 2 hearts
3S	11+, 5 spades and 0-1 heart
3NT	To play
4m	HSST
4H	To play
4NT	Blackwood

 

After 1H > 1NT > 2H,

Bid	Meaning
2S (!!)	10-12, 3+ hearts
2NT	6-10, 1 heart
3H	Invite to game with exactly 2 hearts
3S	HSST
3NT	To play
4m	HSST
4H	To play
4NT	Blackwood

After 1S > 1NT > 2S,

Bid	Meaning
2NT	6-10, 1 spade
3H (!!)	10-12, 3+ spades
3S	Invite to game with exactly 2 spades
3NT	To play
4A	HSST
4S	To play
4NT	Blackwood