If your partner has opened 1♣ (the most common opening), his/her distribution could be almost anything. It is very important to find out more about that distribution, and in particular, to see if a fit in a major suit can be found.
The first requirement for a response is to have 6 DP or more for a response at the 1 level, and 10+ DP for a minimum response at the 2 level (except for the 3♣ response). Minimum point requirements are even higher for bidding after an interfering bid.
Responses are classified as responses to with no interference and with interference.
Responses to a 1♣ Opening with no Interference
|1♦||This is a forcing bid showing
(a) one or two major suits exactly 4 cards long; and/or
(b) a diamond suit 5+ cards long
|With 5-4 in the majors, it is usually better to show the 5-card major
suit first. However, with 10+ DP, you may bid 1♦ at first, to allow for bidding as follows:
1♦ - 1NT - 2♥/2♠
|1♥/1♠||This is a forcing bid showing a 5+ card major suit. You may have 4 cards in the other major.||With 5-5 or 6-6 in the majors, bid 1♠ with 6-9 DP, and 1♥ with 10+ DP. With two unequal majors (6-5, 7-5, 7-6 or 8-5) bid the longer suit first.|
|1NT||Denies a 4-card major suit or longer (4+), and promises 5-9 HCP. Should have a balanced or semi-balanced distribution.|
|2♣||This is a forcing bid showing at least 5 clubs, and no 4+ card major. Promises 9+ HCP. Called an inverted minor single raise.||An excellent way to decide between NT and minor-suit contracts.|
|2♦/2♥/2♠||These are all forcing bids (essentially to game). They promise nice 5+ card suits. Minimum points: 16 HCP.|
|2NT||Denies a 4-card major suit or longer (4+), and promises 10-11 HCP. Should have a balanced or semi-balanced distribution.|
|3♣||This is a pre-emptive bid, showing 5-card support for clubs and no more than 8 HCP. Lower point limit is determined by vulnerability. No 4+ card major suit.||A complementary bid to the 2♣ inverted minor raise.|
|3♦/3♥/3♠||This is a splinter bid, normally forcing to game. The suit bid shows a singleton or void, good 5-card support for clubs and 13+ HCP. No 4+ card major.|
|3NT||The usual bid with 12+ HCP, no 4+ card major and well-distributed points.|
|4♣||Forcing to 5♣ at least. Good 5+ card club support, no 4+ card major, 16+ SP and at least 3 MCCs.||A strong slam try.|
|4♦/4♥/4♠||These are essentially pre-emptive bids with a 7+ card suit and 10+ HCP.||With any perceived chance of 3NT (rather than 4♥, 4♠, 5♦ or slam), other bids should be made.|
|4NT||Blackwood. Very strong try for 6♣ or 6NT.||All you care about is how many Aces opener has.|
|5♣||You have the long suit and the points to play a game contract, but no more than 2 MCC.|
Responses to a 1♣ Opening after Interference
|RHO action||Your bid||Requirements||Comments|
|Double||Pass||Generally with 0-7 DP.||See below.|
|Redouble||This takes the place of the 1? forcing response. Should have one or two 4-card majors, and 8+ DP.|
|1♦||8+ DP and a 5+ card diamond suit. No 4-card major. Forcing.||You may lie a bit with a nice 5-card suit, and bid it with 5-6 DP.|
|All other bids||Same as above, but should have 8+ DP.||You may lie a bit with a nice 5-card suit, and bid it with 5-6 DP.|
|1♦||Pass||Generally with 0-7 DP.|
|Double||This takes the place of the 1♦ forcing response. Should have one or two 4-card majors, and 8+ DP.|
|1NT/2NT/3NT||8-9/10-11/12+ HCP but with some diamond control. No 4-card major.|
|2♦||Cue-bid showing a very strong hand with 5+ clubs support and good control of diamonds. Forcing.|
|Most other bids||Same as above, but should have 8+ DP.||You may lie a bit with a nice 5-card suit, and bid it with 5-6 DP.|
|1♥/1♠||Pass||Generally with 0-7 DP.|
|Double||This takes the place of the 1♦ forcing response (and equivalent to the "negative double"). Should have 4 cards in the unbid major, and 8+ DP. If RHO bids 1?, a double can even mean 5 hearts and 8-9 HCP (as you should not go to the 2 level with <10 points).|
|1NT/2NT/3NT||8-9/10-11/12+ HCP but with some control of opponent's suit. No 4 cards in the unbid major.|
|Cue-bid (e.g. 2♥ over 1♥)||Shows a very strong hand (13+ SP) with 5+ club support and good control of opponent's suit. Forcing.|
|Most other bids||Same as above, but should have 8+ DP.|
|1NT||Pass||Generally with 0-9 DP.|
|Double||This takes the place of the 1♦ forcing response. Should have one or two 4-card majors, and 10+ DP.|
|2NT/3NT||10-11/12+ HCP. No 4-card major.||You are a brave player!|
|2♦/2♥/2♠||5-card suit with 10+ DP|
|3♦/3♥/3♠||5-card suit with 16+ HCP||Now, let me see. Your partner promises 13+ HCP, you have 16+ and so does the RHO. Someone is lying!|
|All other bids||Same as above|
|Other interference bids||Pass||If you are not strong enough to bid something or double.|
|Double||(a) At the 2-level this takes the place of the 1♦ forcing
response. Should have one or two unbid 4-card major(s), and 10+ DP.
(b) At the 3-level or above, it should normally be for penalties.
|Club support||Bid your strength if you can, otherwise pass or double. You should have 5+ clubs and 10-12 SP for 3♣, 13-14 for 4♣ and 15+ for 5♣.|
|Cue-bid (e.g. 1♣ - 1♥ - 2♥)||Shows a very strong hand (13+ SP at the 3-level, 15+ SP at the 4-level) with 5+ club support and good control of 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.|
|NT bids||Enough strength to bid at the level required. Opponent's suit is controlled.|
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