The system uses 5 card majors, 3 card minor French style (1D promises 4 cards unless exactly 4S-4H-3D-2C, 44 and 33 minors are opened 1C), 15-17 1 NT, 20-21 2NT, 2C for the hands just below gameforcing strenght, 2D for the gameforcing hands.
1 C Opening.
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1 C - 1 D : 4+H, 6+, Walsh-style e.i. may have longer diamonds.
1 H : 4+S, 6+, Walsh-style e.i. may have longer diamonds.
1 S : 4+D, 6+, Walsh-style e.i. no 4 card major unless responder has
gameforcing values.
1 NT: 6-10.
2 C : 5+C, 10+, forcing raise.
2 D/H/S : Strong Jump shifts
2 NT: 6-9, 5+C.
3 C : 0-5, 5+C, with a singleton somewhere.
3 D/H/S : Splinters
1 C - 1 D (All this also applies to 1 C - 1 H).
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a) Opener accepts the transfer with 3 card support as well as with 18-19
balanced with 4 card support.
1 H : a) 12-14, 3 H, balanced or unbalanced
b) 15-17, 3 H, unbalanced
c) 18-19, 3 H, unbalanced
d) 18-19, 3/4 H, balanced
Responders rebids over 1H are natural except for 2 C and 2 NT. (See below).
Responder will almost never pass 1 H.
b) Heart raises show 4 card support:
2 H : 12-14, 4 H, balanced or unbalanced
3 D : Splinter, 4 H.
3 H : 15-17, 4 H, unbalanced
3 S : Splinter, 4 H.
4 C : 6C-4H, strong (5 losers or less), no void.
4 D : 6C-4H, strong (5 losers or less), with a void.
4 H : 6C-5H, weak
c) All other bids are natural but deny 3(+) card heart support:
1 S : 4+S, FIR (=Forcing 1 Round).
1 NT: 12-14, balanced, could be 3-1-4-5.
2 C : 6 C, minimum
2 D : Reverse, 4+D-5+C
2 S : Reverse, 4+S-5+C
2 NT: 18-19, balanced, denies 4 S's.
3 C : 6 C, strong hand
3 NT: 6 C, solid suit, all side suits stopped.
1 C - 1 D
1 H - 2 C
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2 C is a relay, showing at least invitational values. Openers rebids are:
2 D : 12-14, balanced. (After 1C-1H-1S-2C: 12-14, 3S, not 4 H).
2 H : 12-14, unbalanced. (After " : 12-14, 3S and 4 H).
2 S : 15-17, unbalanced.
2 NT: 18-19, balanced, 3 H.
3 H : 18-19, balanced, 4 H.
3 Level: 18-19, unbalanced.
Except for 2H and 2 NT over 2D/H, all bids are game-forcing. 2 S over 2D/H
and 2NT over 2S are relays and ask opener to show his distribution. Other bids
are natural.
1 C - 1 D
1 H - 2 NT
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2 NT forces opener to bid 3 C. Responder then bids:
1 C - 1 D
1 H - 2 NT
3 C - Pass : Weak hand with 5C-4H.
3 D : 5H-5D, invitational (1C-1D-1H-3D would be forcing).
3 H : 5H-5C, invitational (1C-1D-1H-3C would be forcing).
If responder holds a balanced invite, he bids 2 C, followed by 2 NT. The
2 NT transfer is also used after 1 C - 1 D - 1 NT.
1 C - 1 S
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1 NT : Balanced minimum, could be 5431, 4441 with short diamonds.
2 D : Unbalanced, 4+D.