96/05/24
FOURTH SUIT FORCING
^^^^^^^^^^^^^^^^^^^^^
1. Applied Situation
1-1. After 1/1 Response
1C-1D;1H-1S sequence is natural and 1-round forcing only.
1-1-1. 2-level Lower Suit
OPN RSP OPN RSP OPN RSP OPN RSP
1C 1H 1D 1H 1D 1S 1H 1S
1S 2D 1S 2C 2C 2H 2C 2D
2-level Fourth Suit lower than first 1/1 Response is
Artificial and Game Forcing unless Responder rebids 2NT next.
+- -+
| Type 1 : 10-12, 5-card Responder's first suit, INV |
| Type 2 : 12+, 5+card Responder's first suit, GF |
| Type 3 : 12+, 4+card SUP for Opener's first/second suit, GF |
| Type 4 : 12+, no available bid, GF |
+- -+
1-1-2. 2-level Higher Suit / 3-level Suit
OPN RSP OPN RSP OPN RSP OPN RSP
1C 1D 1C 1D 1D 1H 1H 1S
1H 2S 1S 2H 2C 2S 2D 3C
2-level Fourth Suit higher than first 1/1 Response or
3-level Fourth Suit is Artificial and unconditionally Game Forcing.
+- -+
| Type 2 : 12+, 5+card Responder's first suit, GF |
| Type 3 : 12+, 4+card SUP for Opener's first/second suit, GF |
| Type 4 : 12+, no available bid, GF |
+- -+
1-2. After 2/1 Response
OPN RSP OPN RSP OPN RSP OPN RSP
1H 2C 1S 2C 1S 2C 1S 2D
2D 2S 2D 2H 2H 3D 2H 3C
2-level/3-level Fourth Suit after 2/1 Response is
Artificial and unconditionally Game Forcing.
+- -+
| Type 2 : 12+, 6+card Responder's first suit, GF |
| Type 4 : 12+, no available bid, GF |
+- -+
2DOpener's Rebid
+- -+
| 1) show 3-card SUP for Responder's suit ( Jump = 15+ ) |
| 2) show minmum with no SUP ( 2X = 12-13 ) |
| 3) show Stopper of fourth suit ( 2NT = 12-14, 3NT = 15-17 ) |
| 4) show 6+card suit / good 5+card suit |
| 5) show good 4+card second suit |
| 6) show 4+card fourth suit SUP |
+- -+
2-1. After 1/1 Response
OPN RSP
1C 1H
1S 2D
??
2H = 12-14, usually 3 HEA, may be good 2 HEA
2S = Artificial ; usually 12-13, -2 HEA
2NT = 12-14, with DIA STP, -2 HEA
3C = 12-17, good 5+CLU, -2 HEA
3D = 12-17, 4 DIA ( 4045 exactly )
3H = 15-17, 3 HEA
3S = unlikely
3NT = 15-17, with DIA STP, -2 HEA
4C = 15-17, (semi-)SOL 6+CLU, -2 HEA
OPN RSP
1D 1S
2C 2H
??
2S = 12-14, usually 3 SPA, may be good 2 SPA
2NT = 12-14, with HEA STP, -2 SPA
3C = 12-17, good 4+CLU, -2 SPA, doesn't promise 5 CLU
3D = 12-17, good 5+DIA, -2 SPA
3H = 12-17, 4 HEA ( 1444/0454 exactly )
3S = 15-17, 3 SPA
3NT = 15-17, with HEA STP, -2 SPA
4C = 15-17, good 5+DIA & 5+CLU, -2 SPA
4D = 15-17, (semi-)SOL 6+DIA, -2 SPA
OPN RSP
1H 1S
2C 2D
??
2H = Artificial ; usually 12-13, -2 SPA
2S = 12-14, good 2 SPA
2NT = 12-14, with DIA STP, -2 SPA
3C = 12-14, good 4+CLU, -2 SPA, doesn't promise 5+CLU
3D = 12-17, 4 DIA ( 0544 exactly )
3H = 15-17, (semi-)SOL 6+HEA, -2 SPA
3S = unlikely ( 2NT was available )
3NT = 15-17, with DIA STP, -2 SPA
4C = 15-17, good 5+HEA & 5+CLU, -2 SPA
OPN RSP
1C 1D
1H 2S
??
2NT = 12-14, with SPA STP, usually -2 DIA
3C = 12-17, good 5+CLU, usually -2 DIA
3D = 12-14, 3 DIA, may be BAL
3H = 12-17, good 4+HEA, doesn't promise 6+CLU & 5+HEA
3S = 12-17, 4 SPA ( 4414/4405 exactly )
3NT = 15-17, with SPA STP, usually -2 DIA
4C = 15-17, (semi-)SOL 6+CLU, usually -2 DIA
4D = 15-17, 3 DIA ( 1435/0436 exactly )
OPN RSP
1D 1H
2C 2S
??
2NT = 12-14, with SPA STP, -2 HEA
3C = 12-17, good 4+CLU, -2 HEA, doesn't promise 5+CLU
3D = 12-14, good 5+DIA
3H = 12-14, 3 HEA
3S = 12-17, 3 SPA (3154/3055/3064 exactly )
3NT = 15-17, with SPA STP, -2 HEA
4C = 15-17, good 5+DIA & 5+CLU, -2 HEA
4D = 15-17, (semi-)SOL 6+DIA, -2 HEA
4H = 15-17, 3 HEA
OPN RSP
1H 1S
2D 3C
3D = 12-17, good 4+DIA, -2 SPA, doesn't promise 5 DIA
3H = 12-17, good 5+HEA, -2 SPA
3S = 12-17, good 2 SPA
3NT = 12-14, with CLU STP, -2 SPA
4C = unlikely
4D = 15-17, good 5+HEA & 5+DIA, -2 SPA
4H = 15-17, (semi-)SOL 6+HEA, -2 SPA
2-2. After 2/1 Response
OPN RSP
1H 2C
2D 2S
2NT = 12-14, with SPA STP, usually -2 CLU
3C = 12-14, 3 CLU
3D = 12-14, good 4+DIA, -2 CLU, doesn't promise 5+DIA
3H = 12-17, good 5+HEA, usually -2 CLU
3S = unlikely
3NT = 15-17, with SPA STP, usually -2 CLU
4C = 15-17, 3 CLU
4D = 15-17, good 5+HEA & 5+DIA
4H = 15-17, (semi-)SOL 6+HEA
OPN RSP
1S 2C
2H 3D
3H = 12-17, good 4+HEA, usually -2 CLU, doesn't promise 5+HEA
3S = 12-17, good 5+SPA
3NT = 12-14, with DIA STP
4C = 12-17, 3 CLU
4D = 15-17, 4 DIA ( 5440 exactly )
4H = 15-17, good 5+SPA & 5+HEA
4S = 15-17, (semi-)SOL 6+SPA