Responses are classified as responses to with no interference and with interference.
Responses to a 1♥/1♠ Opening with no Interference
| Your bid | Requirements | Comments |
| Pass | Best bid with 0-5 DP. | |
| 1♠ (after 1♥) | This is a forcing bid showing a 4+ card spade suit. | It is OK to show a 4-card (or longer) spade suit even with 3-card heart support. |
| 1NT | Denies 4+ card spade support after a 1♥ opening, and promises 5-9 HCP. Forcing in third and fourth position. | The only possible response with a weak hand with no support for opener's suit and no 4 spades after a 1♥ opening. |
| 2♣/2♦ | Forcing bid, showing 10+ HCP and (generally) a 4-card suit. | Occasionally, a good 3-card suit may be bid, if aiming at a NT contract and worried about one of the unbid suits. |
| 2♥ (after 1♠) | Forcing bid, showing 10+ HCP and at least a 5-card heart suit. | |
| Raise to 2/3 of opener's suit | 6-10/11-12 SP, with at least 3-card support. | |
| Jump bids in an unbid suit | These are all forcing bids (essentially to game). They promise nice 5+ card suits. Minimum points: 16 HCP. | |
| 2NT | 4-card support for opener's suit and 13+ SP. | This is the Jacoby Convention. |
| Raise to 4 of opener's suit | 5-card support, with around 10 HCP. | Mostly preemptive bid, with no likelihood of a slam. |
| Double jump bids in an unbid suit (e.g. 1♥ - 3♠; 1♠ - 4♦) | Forcing at least to game in opener's suit. The suit bid shows 13+ SP, a singleton or void, and a nice 3+ (but preferably 4)-card support for opener's suit. | A splinter bid. |
| 3NT | The usual bid with 12-15 HCP, no 4+ card major and a balanced hand. | |
| 4NT | Ace-asking bid. | The Blackwood convention. |
NB: Supposedly forcing bids showing a new suit (e.g. 1♠ - 2♦) are not forcing if made by a passed hand.
Responses to a 1♥/1♠ Opening after Interference
| RHO action | Your bid | Requirements | Comments |
| Double | Pass | With 0-7 HCP if 0-2 in partner's suit, and with 0-5 SP with 3+ in partner's suit. | |
| Redouble | This bid promises 8+ DP and 4 cards in the other major. Forcing | ||
| 1♠ (after 1♥ - DBL) and 2♥ (after 1♠ - DBL) | 8+ DP and a 5+ card suit. | ||
| All other bids | Same as above. | ||
| 1♠ (over 1♥) and 2♥ (over 1♠) | Pass | With 0-7 HCP if 0-2 in partner's suit, and with 0-5 SP with 3+ in partner's suit. | |
| Double | At least 4-4 in the minors, 0-2 in opener's suit and 0-3 in the other major. 8+ HCP at the 1 level, 10+ HCP at the 2 level. | ||
| 1NT/2NT/3NT | 8-9/10-11/12+ HCP but with some control of opponent's suit at the 1NT level and good control at the 2/3NT level. Probably 2 cards in partner's suit. | ||
| Cue-bid (e.g. 2♠ over 1♥ - 1♠) | 10+ SP with 3+ support for partner's suit and shortness in or strong control of the opponent's suit. Forcing. | ||
| Other bids | Same as above | ||
| 1NT | Pass | Generally with 0-9 DP, unless able to raise partner's suit. | |
| Double | For penalties. | ||
| New suit at the 2 level | 8+ DP, with 5-card suit. | ||
| Other bids | Same as above | ||
| Simple overcall at the 2-level (e.g. 1♥ - 2♣) | Pass | Generally with 0-9 DP, unless able to raise partner's suit. | |
| Double | 10+ DP and showing 4 cards in the other major, or at least 4-4 in the minors if both majors have been bid. | Negative double. | |
| 2NT/3NT | 10-11/12+ HCP, with good control of opponent's suit. Probably 2 cards in partner's suit. Denies 4 cards in any unbid major. | ||
| Cue-bid (e.g. 3♣ over 1♥ - 2♣) | 10+ SP with 3+ support for partner's suit and shortness in or strong control of the opponent's suit. Forcing. | ||
| Most other bids | Same as above | ||
| Higher interference bids | Pass | If you are not strong enough to bid something or double. | |
| Double | 10+ DP and showing 4 cards in the other major, or at least 4-4 in the minors if both majors have been bid. | Negative double. | |
| 2NT/3NT | 10-11/12+ HCP, with good control of opponent's suit. Probably 2 cards in partner's suit. Denies 4 cards in any unbid major. | ||
| Cue-bid (e.g. 1♥ - 3♦ - 4♦) | Shows a strong hand with good support for partner's suit and shortness in or strong control of the opponent's suit. Forcing. | ||
| New suit at minimum level | 5-card suit and enough strength to bid at the level required. Unless already at game, forcing. | ||
| New suit with jump shift | 5-card suit and wishing to show extra strength. Unless already at game, forcing. |
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