Responses to 1♣
1♣ ---
1♦ : 6+ HCP, 4+♦. Denies a 4-card major with less than GF strength.
1♥ : 6+ HCP, 4+♥. With 4-4 majors, bid 1♥.
1♠ : 6+ HCP, 4+♠. With 5-5 majors, bid 1♠.
1NT : 6-10 HCP, 4+♣ support.
2♣ : 10+ HCP, 4+ card support, forcing to 2NT/3♣.
2♦/♥/♠ : Weak jump shift, 3-6 HCP, 6+ suit, concentrated values.
2NT : 11-12 HCP, balanced, inv.
3♣ : Preemptive raise.
3♦/♥/♠* : 12-15 HCP, Splinter, 5+ cards support
3NT : 12-15 HCP, balanced, to play.
Developments After 1♣ - 1♦
1♣ - 1♦;
1♥ : 12-17 HCP, 4+♥, unbalanced (54+ or 4441 shape).
Pass : 5-7 HCP, 3♥ support and no 4-card ♣ suit.
1♠* : 12+ HCP, 4th Suit GF.
1NT : 8-10 HCP, usually balanced.
2♣ : 12-14 HCP, 6+♣.
2♦ : 12-14 HCP, 4♦.
2♥ : 12-14 HCP, 6+♣, 5+♥.
3♣ : 15-16 HCP, 6+♣.
3♦ : 15-16 HCP, 4♦.
3♥ : 15-16 HCP, 6+♣, 5+♥.
3NT : To play.
2♣ : Weak signoff, 4+ cards. May be 3 cards if no 3-card major support and not strong enough for 1NT.
2♦ : 6-10 HCP, 6+♦.
2♥ : 8-10 HCP, 3-card support, unbalanced, unsuitable for 1NT or other bids.
2♠ : Reverse response, 12+ HCP, 5+♦, 4♠, GF.
2NT : 11-12 HCP, balanced, inv to 3NT.
3♣ : 11-12 HCP, 4+♣, inv.
3♦ : 11-12 HCP, 6+♦, natural inv.
3♥ : 4♥ support, 5+♦, GF.
3♠ : 4♥ support, splinter in ♠, 5+♦, GF.
3NT : To play.
1♠ : 12-17 HCP, 4+♠, unbalanced.
(Developments similar to 1♥ rebid, ♥ and ♠ roles reversed)
1NT : 12-14 HCP, balanced, does not deny a 4-card major
2♣* : {Transfer to 2♦. Weak with diamonds, or hands that don't fit other inv bids}
2♦* : {Artificial, GF. For hands that don't fit other GF bids.}
2♥/♠ : 5♦+4M, GF.
2NT : Inv.
3♣ : 5♦+5♣, GF.
3♦ : {Solid 7+♦, GF and showing slam interest}
3♥/♠* : Splinter, 5♦+4♣, shortness in bid suit, slam interest, GF.
3NT : To play.
2♣ : 12-15 HCP, 6+♣.
2♦ : 12-15 HCP, 4+♦ support.
2♥ : 18+ HCP, jump shift (reverse), 5+♣, 4+♥, GF.
2♠ : 18+ HCP, jump shift (reverse), 5+♣, 4+♠, GF.
2NT : 18-19 HCP, balanced, allows 4-card major.
3♣ : 16-17 HCP, 6+♣.
3♦ : 16-17 HCP, 4+♦.
3♥/♠* : Splinter for ♦ support, 18+ HCP.
3NT : Solid 6-7 card ♣ suit, 7.5-9 winners, stoppers in unbid suits.
Developments After 1♣ - 1♥
1♣ - 1♥;
1♠ : 4+♠
Pass : 5-7 HCP with 3♠, or 5-6 HCP with 4♠.
1NT : 6-10 HCP, not necessarily balanced.
2♣ : Weak raise.
2♦* : 4th Suit Forcing.
2♥ : Weak, 6+♥ suit.
2♠ : 7-9 HCP, 4-card support, simple raise.
2NT : 11-12 HCP, natural, inv.
3♣ : 4+ card support, inv.
3♦ : 5♦+5♥, inv.
3♥ : Good 6+♥ suit, inv.
3♠ : 4-5♥ + 4♠ support, inv.
3NT : To play with 4♥ and stopper in unbid suit. If 5♥, balanced with stoppers.
4♥ : 7+ card suit, based on shape.
4♠ : 10-15 HCP, ♠ 4.
1NT : Balanced, denies 4♠.
2♣* : Transfer to 2♦. Weak with diamonds, or any inv hand.
2♦* : Artificial, GF. For hands that don't fit other GF bids.
2♥ : 6+ card suit, weak.
2♠ : Reverse response, GF.
2NT : Forcing transfer to 3♣. After 3♣, Pass = weak clubs, 3♦=5-5+ invite.
3♦ : 5-5+ two-suiter, GF.
3♥ : 6+ card semi-solid suit, GF.
3NT : To play, generally 4-card major.
2♣ : 12-15 HCP, ♣ 6+.
2♦* : 3th Forcing, ♦ 3+, inv+, usually with ♥ 5, forcing to 2NT/3♣.
2♥ : 8-9 HCP, 5 good or 6-card suit, non-forcing.
2♠* : 3th Forcing, ♠ 3+, inv+, usually with ♥ 5, forcing to 2NT/3♣.
2NT : inv, no ♥ 5, ♣ 1-2
3♣ : inv, ♣ 2+
3♦ : ♥ 4, ♦ 6+, GF
3♥ : ♥ 6+, inv
3♠/4♦* : splinters
3NT : to play
4♥ : to play
2♦ : 16+ HCP, reverse, F1, or 18+ unbalanced with 3-card suit.
2♥ : 12-14 HCP, 4-card support
2NT : Relay, inv+.
3♥ : minimum
3NT : maximum 4-3-3-3, to play
4♥ : maximum, to play
3♣/♦ : help suit game try
3♥ : trump game try
2♠ : 16+ HCP, reverse, F1.
2NT : 18-19 HCP, relatively balanced.
3♣ : Relay, usually with 5-Major (We always use 3♣ relay after opener's 2NT rebid)
3♣ : 15-17 HCP, 6+♣ good suit.
{-6ex}
{
3♦ : {small splinter, 13-15 HCP, or}
: {super strong splinter, 19+ HCP, slam interest}
3♥ : 15-17 HCP, 4-card support, inv.
3NT : {solid ♣ suit to play, short in ♥}
4♣ : {13-15 HCP, ♣ 6+, ♥ 4}
3♠/4♦ : {normal splinter, 16-18 HCP}
}
Developments After 1♣ - 1♠
1♣ - 1♠;
1NT : Balanced, denies 3145 shape.
2♣* : Transfer to 2♦. Weak with diamonds, or any inv hand.
2♦* : Artificial, GF.
2♥ : 5♠4♥, weak.
2♠ : 6+ card suit, weak.
2NT : Forcing transfer to 3♣. After 3♣, Pass = weak clubs, 3♦=5-5+ invite.
3♣ : GF, 5+♣, 5+♠.
3♦ : GF, 5+♦, 5+♠.
3♥ : GF, 5+♥, 5+♠.
3♠ : GF, solid suit.
3NT : To play.
2♣ : 12-15P, rebid own 6-card suit.
2♦* : 3th Forcing, ♦ 3+, inv+, usually with ♠ 5, forcing to 2NT/3♣.
2♥ : Weak, 5♥5♠.
2♠ : Weak, 6+♠.
2NT : Natural, inv.
3♣ : inv with 2+ support.
3♦/♥ : Inv, 5♠ with 5+ other suit.
2♦ : 16+ HCP, reverse, F1.
2♥ : 16+ HCP, reverse, F1.
2♠ : 12-14 HCP, 4+ card support.
2NT : Relay, inv+.
3♠ : minimum
3NT : maximum 4-3-3-3, to play
4♠ : maximum, to play
3♣/♦ : help suit game try
3♠ : trump game try
2NT : 18-19 HCP, balanced.
3♣ : 15-17 HCP, 6+♣ good suit.
{-6ex}
{
3♦/♥* : {small splinter, 13-15 HCP, or}
: {super strong splinter, 19+ HCP, slam interest}
3♠ : 15-17 HCP, 4+ support, inv.
3NT : {solid ♣ suit to play, short in ♠}
4♣ : {13-15 HCP, ♣ 6+, ♠ 4}
4♦/♥* : {Normal Splinter, 16-18 HCP}
}
Competition over 1♣ Opening
1♣ - (1X) - ?
Dbl* : Negative Dbl, 7+ HCP.(Note: 1♣ -- (1♦) --Dbl = ♠-♥ 4-4)
New suit : Natural, forcing (Note: 1♣ --(1♥) -- 1♠ = ♠ 5+)
1NT : 7-10 HCP, stopper.
2♣ : 6-9 HCP, 4-5 cards, competitive.
3♣ : Preemptive.
2NT : Natural inv
Cue bid : GF, no fit
3NT : to play
1♣ - (1NT) - ?
Dbl : 9+ HCP, penalty.
2♣ : 5-4+ majors, Landy-style.
2♦/♥/♠ : 6-10 HCP, natural.
2NT* : ♦ 5+, ♣ 3+