A suit opening is made with a 5-card suit or a good 4-card suit with about 13-22 points.
Responses to 1♦, 1♥ and 1♠ openings[]
| 0-5 | 6-10 | 11-12 | 13-15 | 16 | 17-18 | 19+ | |
|---|---|---|---|---|---|---|---|
| 5-card support | raise to 4 | raise to 3 | |||||
| 4-card support | raise to 2 | ||||||
| good 3-card support | |||||||
| 5-card suit | 1/1 | jump shift | |||||
| 1NT | 2/1 | ||||||
| 4-card suit | 1/1 | ||||||
| 1NT | 2/1 | ||||||
| balanced hand | 2NT | 3NT | |||||
- single raise: constructive, 7-10 points, 4 of the suit or 3 with honours;
- jump raise: forcing, 13-16 points, 4 of the suit;
- raise to a major game: preemptive, 10- points, 5 of the suit;
- 1/1: 6+ points, 4 of the suit, forcing for one round;
- 2/1: 11+ points, 4 of the suit, forcing for one round;
- 1NT: 6-10 points, no biddable major;
- 2NT: 13-15 points, balanced, stopper in all unbid suits, forcing;
- 3NT: 16-18 points, balanced, stopper in all unbid suits;
- jump shift: 19+ points, single-suited, slam interest
Responses to a 1♣ opening[]
The 1♣ opening is forcing for 1 round: