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1♣ Opening

1R
TRF, 0+ (or 5+ with only 4-suit)
1♠
TRF NT (any except 16-18), INV w/54mm+, 5-12.5 w/♣, 5+ w/♦
1NT
nat INV w/o M4
2♣
GF, 5+♣
2R
TRF, 6+M, 3-6 or GF
2♠
9-10, 54mm+ (5-8 thru 1♠)
2NT
16-18, bal, w/o M4
3♣
PRE, (5)6+♣
3♦
SPL
3M
SPL
3NT
12.5-15, bal, w/o M4
4♣
PRE
4M
to play, long suit w/o outside control, semiPRE
4NT
19-20, bal, w/o 4M (S/T against partner’s 11-14)

1♣-1R

1♣-1♦

1♥
11-16, 2-3♥, also used w/11-14 and =4315
1♠
11-16, 5+♣ 4♠, unbal
1NT
17(18)-19, bal, w/o support
2♣
11-16, 6+♣ or 5♣ 4♦
2♦
nat reverse or 6+♣, 17+
2♥
11-14, 4♥
2♠
nat reverse
2NT
15+, 6+♣ 3♥ or 5+♣ 4♥
3♣
15-16, good 6+♣
3♦
SPL, 17+
3♥
17+, 4+♥

1♣-1♥

1♠
11-16, 2-3♠
1NT
17/18-19, bal w/o support
2♣
11-16, 6+♣ or 5♣4R
2♦
nat reverse or 6+♣, 17+
2♥
nat reverse
2♠
11-14, 4♠
2NT
15+, 6+♣ 3♠ or 5+♣ 4♠
3♣
15-16, good 6+♣
3R
SPL, INV+
3♠
17+, 4+♠

With four of a major and six diamonds and enough strength to bid, responder to one club should bid whichever suit judgment dictates, depending on the quality of the suits.

1♣-1R-1NT

2♣
GF, ask for 3M, 4oM (bid lower first)
2♠
TRF or CONFIT, TRF weak or INV, super accept for 2♠ TRF is 2NT, sbsq. 3♦ CONFI, responses 5(-)-6-7-8
2♦-3♣
TRF, weak or INV (w/super accept)
2NT
nat INV
3R
re-TRF, S/T+, 6+M
4R
re-TRF, GF, 6+M

1♣-1♦-1NT-2♣-2♥

2♠
no 5♥ or 4♠ (sbsq. 2NT or 3m extras, 3NT w/o extras)
2NT
4♥ 4♠ extras
3NT
4♥ 4♠ w/o extras

1♣-1♥-1NT-2♣-2♥

2♠
0-3♥ 4♠ (sbsq. 2NT or 3m extras, 3NT w/o extras)
2NT
0-3♥ 5♠ w/extras
3NT
0-3♥ 5♠ w/o extras

1♣-1♦-2♣

2♦
art GF
2♥
6+♥, 7-10
2NT
nat INV
3♣
9-10
3♥
6+♥, INV

1♣-1♥-2♣

2♦
art GF
2♥
5♥ 5♠, 5-10
2♠
6+♠, 7-10
2NT
nat INV
3♣
9-10
3♥
5♥ 5♠, INV
3♠
6+♠, INV

1♣-1R-2♦

2oM
art GF (sbsq. 2NT 5♣ 4♦, 3♣ 6332/7222 w/clubs, other 6+♣ shortness)
2NT
INV
2M (R+1)
5+M, nF
3♣
to play

1♣-1R-2oM

mini-Lebensohl – raise thru 2NT 5-6, directly GF 7+
1♣-1♥-2♥ 2♠ 5+♠ 0-6, 3♠ GF 6+, 3♠ thru 2NT only 5♠ GF
1♣-1♦-2♠ 3♥ 5-6♥ GF (weaker thru 1♣-2♦ or w/5-suit thru 1♣-1♦-2♠-2NT-3♣-3♥)
w/7+ bal bid 3NT directly w/o ♦ stopper, thru 2NT w/♦ stopper

1♣-1R-2NT

3♣
4R+1, 5-6
3R
re-TRF, INV+, 4+R+1 (super accept by 3NT sbsq. re-trf 4R)
3R+1
5M, 5-6
3NT
4R+1, GF
3♦ (after 1♥)
S/T, 5+♦ 4♠
3♠ (after 1♦)
S/T, 5+♦ 4♥

1♣-1R-3♣

3R+1
5+M, GF
other
lowest stopper

1♣-1R-2R+1

2R+2
ask (2NT onto 2♥shows ♠shortness), 3m shortness m, INV+

1♣-1♠

1NT
11-13(14), bal or =4414
2♣
11-16, 6+♣or 5♣4x
2♦
nat reverse or 17(18)-19,bal or=4414
2M
nat reverse
2NT
17+, 6♣322 or 7222
3♣
15-16, good 6+♣
3♦/♥/♠
17+, 6+♣, shortness 

1♣-1♠-1NT

2♣
s/o w/♦ or any INV
2♦
GF, ask
2M
INV, 54+ minors and shortness M
2NT
s/o w/♣, mixed
3m
nat INV, 6+m
3M
GF 55+ minors and shortness M
3NT
to play

1♣-1♠-2♣

2♦
nat GF
2M
5+♦ 4M, GF
2NT
nat INV
3♣
9-10
3♦
nat INV

1♣-1♠-2♦

2♥
GF ASK
2NT
bal INV
2♠
5+♦ 4♣, 5-6
3♣
5+♣ 4♦, 5-6
3♦
6+♦, 5-6

1♣-1♠-2♦-2♥

2♠
17(18)-19, =4414
2NT
17(18)-19, bal
3♣
17-18, 5+♣ 4+♦
3♦
19-20, 5+♣ 4+♦

1♣-1♠-2M

mini-Lebensohl – ♣ raise thru 2NT 5-6, directly GF 7+,
w/7+ bal bid 3NT directly w/o oM stopper, thru 2NT w/stopper

1♣-1NT

2♣
correction
2♦/♥/♠
nat reverse
2NT
17(18)-19, bal (subsequently 3m = nat 4+ S/T)
3♣
17+, 6♣(322) or 7222
3♦/♥/♠
17+, 6+♣ and shortness
3NT
to play

1♣-2♣

2♦
11-13(14), waiting or 14+, 6+♣ or 5♣ 4♦
2M
nat, 4M
2NT
17(18)-19, bal
3♣
11-13, 5+♣
3♦/♥/♠
17+, 6+♣ and shortness

1♣-2♣-2♦

2M and 3♦
lowest stopper
2NT
waiting (3♣ Hxx+ in ♣, 3♦ 5332 w/5♦ max, 3NT everything else)
3♣
6+♣

1♣-2R

2M
0-2M, 11-16
2♠
5+♣ 4♠, 17+
2NT
6+♣ or 5♣ 4♦, 17+
3♣
0-1M, 11-16, 6+♣
3♦
2+M, 17+
3♥
5+♣ 4+♥, 17+
3M
11-13(14), 3+M
4M
11-13(14), 6+♣ 4M

1♣-2R-2NT

3♣
s/o
3R
re-TRF
3♦ (after 2♥)
S/T, w/♦ support (suggests no ♣ support)
3♠ (after 2♦)
S/T, w/♦ support (suggests no ♣ support)
3NT
to play
4♣
S/T

1♣-2R-3♣

3R
re-TRF
3NT
to play
4♣
S/T

1♣-2♠

2NT
ask for longer minor or S/T w/6+♣ and M shortness
3m
to play
3M
GBS
3NT
to play

1♣-2NT

3m
13+, 4+m
3M
13+, 6+♣ shortness

1♣-3♣

3♦/♥/♠
GF, lowest stopper (applies also after 1♣-1♠-1NT-3♣)

When 2nd hand interferes

1♣-(X)-?
1♣-(1♦)-?
1♣-(1♥)-?
System ON

1♣-(1♦)-TRF-(p)

1M
3M, 11-16
1NT
2M, 11-16
2♦
17+, (semi)bal or 6+♣
2oM
nat reverse, GF
2M
4M, 11-14
2NT
15+, 6+♣ 3M or 5+♣ 4M
3♣
15-16, good 6+♣
3M
4M, 17+

1♣-(1♥)-TRF-(p)

2♦
17+, 5+♣ 4♦ or 6+♣
2♥
17+, (semi)bal
Rest
same as after 1♦ overcall

1♣-(X)-TRF-(p)

1M
2-3M, 11-16
1NT
2-3M, 17+, (semi)bal
2♦
17+, 5+♣ 4♦ or 6+♣
2oM
nat reverse, GF
2M
4M, 11-14
2NT
15+, 6+♣ 3M or 5+♣ 4M
3♣
15-16, good 6+♣
3M
4M, 17+

If 4th hand doubles:

Pass
0-1M, no other suitable bid
XX
2M
1M
3M

1♣-(1♠)

X
7+, 4+♥
1NT
7-10
2♣
7+, 6+♦ or 5♦ 4+♣ GF
2♦
7+, 6+♥ or 5♥ 4+m GF
2♥
7+, (5)6+♣
2♠
GF, 0-3♥
2NT
nat INV
3♣
PRE, (5)6+♣
3♦
GF, 6+♦
3♥
GF, 6+♥

1♣-(1♠)-2♣-(P or X)

(X)-P
0-1♦, 11-16
2♦
to play against 7-10
2♥
17+, 5+♣ 4♥
2♠
GF ask
2NT
GF bal w/stopper
3♣
15-16, 6+♣ (weaker-bid 2♦)
3♦
INV
3M
SPL

1♣-(1♠)-2♣-(P or X)-2♦-(P or X)

2♥
semi-nat INV, F
2♠
GF ask
2NT
nat INV
3♣
5+♦ 4+♣, GF
3♦
nat INV
3M/4♣
SPL

1♣-(1♠)-2♦-(P or X)

(X)-P
0-1♥, 11-16
2♥
to play against 7-10
2♠
GF ask
2NT
GF bal w/stopper
3♣
15-16, 6+♣ (weaker-bid 2♥)
3♦
GF, 5+♣ 4+♦
3♥
INV
3♠
SPL

1♣-(1♠)-2♦-(P or X)-2♥-(P or X)

2♠
GF ask
2NT
nat INV
3m
5+♥ 4+m, GF
3♥
nat INV
3♠/4m
SPL

1♣-(1♠)-2♦-(P or X)-2NT-(P or X)

3♣/♦/♥
nat
3♠/4m
SPL

1♣-(1♠)-2♥-(P or X)

2♠
15+ ask (2NT 9-10, 3♣ 7-8)
2NT
min
3♣
accepting if INV
3♦
GF, 5+♣ 4+♦
3♥
GF, 5+♣ 4+♥
3♠
GF ask
4♣
GF

1♣-(1NT)

Hello ON (X is for PEN)

1♣-(2♣/2♦/2M)

X
Negative, (7)8(9)+
2 in a suit
7-10(11), nF, (5)6+ suit
3 in a suit
GF (may be stretched), (5)6+ suit (always 6+ when jump)
2NT
nat INV
cue
GF, ask for stopper
3NT
to play

1♣-(3x)

X
after minor both M4+ INV+, after Major Thrump, double seeking 3NT
other
nat
new suit 3rd lvl
nat GF
3NT
to play
4♣
strong hand
4NT
nat INV

When 4th hand interferes

1♣-(p)-1R-(X)

1NT
17-19, (semi)bal
XX
2R+1, 11-16
1R+1
3R+1, 11-16
2nd lvl
system on with minor implication changes due to the 1st lvl structure

4th hand overcalls (no jump) on the 2nd lvl after our 1♣-1R

X
support
2NT
17-18(semi)bal w/stopper
Cue
INV+, stopper ask
3M
15-18 w/support
3NT
19+ w/stopper

4th hand PRE

1♣-(p)-1R-(2R+1 to 3R-1, i. e. when we have at least two suit bids available)

3R+1
11-14 w/4 card support and not a very defensive hand - (can be stretched NV)
X
17+, DSI3
3 unbid
INV w/4+ card support (if two calls free, then w/values here rather than in unbid one)
3♣
15-16, 6+♣

1♣-(p)-1R-(3a)-p-(p)

X
(IMPs) GF
(MPs) 9+
3b
(IMPs) 9-12.5
(MPs) 9+

When they reopen

Openers bidding after RHOs reopen X:

XX
17-19 semibal
1NT
6+ suit which was opened, 17+
rebid 2nd lvl
good 6+ suit 15-16
new suit
17+, 55+
3rd lvl action
extra strong, 9 tricks against bust

Openers bidding after RHOs suit reopen

X
17+, T/o
1NT
17-19, (semi)bal w/stopper
rebid 2nd lvl
17+, 6+ suit
new suit
17+ 5+ 5+
3rd lvl action
extra strong, 9 tricks against bust

Openers bidding after RHOs 1NT reopen

X
17+ DSI3
rebid 2nd lvl
17+, good 6+ suit
new suit
17+, 5+ 5+
3rd lvl action
p/c or to play against a complete bust and misfit

1♣-(X)-p-(p)

Pass
5+♣ or 4♣ with nowhere to run to - like Axx xxx xxx AQJ9
Bid
4 or fewer ♣, nat