After the sequence:

1S 1NT (forcing)

2C 2D

2D shows a variety of hands.

Opener re-bids as though it were showing 5 hearts: 2H = 2-3 hearts; 2S = denies 2 hearts (5-1-3-4 or 5-0-4-4); 3C = 5+ clubs (5 spades, 6+ clubs); 2N = ??? (5 spades, 5 clubs); others = ???

After opener's rebid, responder rebids: 2S doubleton spades with 8-9 points; 2NT 4 card club suit, (10-11 points); 3C 5 card club suit, (10-11 points); 3D wants to play in diamonds.

Implications of sequences

1. 1S 1NT 2C 2S---- 0-7 points, 2+ spades
2. 1S 1NT 2C 2H---- 6 card heart suit
3. 1S 1NT 2C 3C---- 5 clubs with 7-9 points
4. 1S 1NT 2C 2D 2H 2S = 2 or 3 hearts or doubleton spades, 8-9 points
5. 1S 1NT 2C 2D 2S 3S = denies 2 hearts or doubleton spades, 8-9 points
6. 1S 1NT 2C 2D 2S 2NT = denies 2+ hearts or 4 card club suit, 10-11 points
7. 1S 1NT 2C 2D 2H 3C = 5 clubs, 10-11 points