1♦          < 8 (or poor 8) (and see [*1])

            1M/2m  8 – 11, 5cd suit

            1NT      8 – 11, no 5cd (or poor 5) suit

            2M/3m  12+, 5cd suit

            2NT      12+, no 5cd suit

                        rebid of 3♣  after 2NT is Baron [*2]

1♦  12 – 13 flat (?? 5cd♣ ); or 12 – 15, 5cd♦  suit

            pass     < 5

            1 any    5 – 9, 5cd suit

            1NT      5 – 9, no biddable 5cd suit

            2♣        Stayman [*1]: 10+, any shape

            2other   10 – 11, 5cd suit

            2NT      =12, no 5cd M (inviting game)

            3 any    12+, 5cd suit (forcing to game)

            3NT      13 – 19, flat

1M 12 – 15, 5cd suit (if both, bid ♠  first)

            2 of suit 6 – 9, 3cd fit

            3 of suit 10 – 11, 3cd fit

            4 of suit 12 – 15, 3cd fit

            change suit is 8 – 11, 5cd suit

            1NT      8 – 11, < 3cd in opener’s suit

                        rebid of 1^st suit shows(?) 6+cd suit

1NT 14 – 15, no 5cd M, flat (?? 5cd m)

            2♣        Stayman [*1]: 8+, any shape

            2other   < 9, 5+cd suit (weak takeout)

            2NT      =10 (inviting game)

            3any     10+, 5+cd suit (encouraging)

            3NT      11 – 16, no 5cd suit or 4cd M

2♣  14 – 15, gd 5 or 6cd ♣   suit

            2other   8 – 10, 5cd suit, club shortage

            2NT      8 – 10, no gd 5cd suit, no fit

            3♣        8 – 11, 2 or 3 clubs

            3other   11+, 5cd suit

            3NT      11 – 16, no 5cd M

            4♣        12+, gd support (forcing?)

2♦  22+ any shape

            2♥        < 8 (other bids slam seeking?) [*2]

            2♠        8+, 5cdª suit

            3other   8+, 5cd suit

            2NT      8+, no 5cd suit

                        3♣  rebid after 2NT is Baron [*2]

2NT 20 – 21, flat

            3♣        Baron [*2]: 12+ (slam seeking)

            3other   3 – 4, 5cd suit

            3NT      5 – 10, no 4cd M (to play)

            4♦         4+, 6cd suit (unbalanced)

            4M        4+, 5cd suit (slam unlikely)

            ??         5 – 10, 4cd M

preemptive bids

2M weak:          6 – 10, gd 6cd suit

3any preempt:   < 10, 7cd suit

4any preempt:   =10, 8cd suit

            respond to any above only with 16+ points

Stayman [*1]: combined 22+

asks for 4cd M as follows:

1♦  – 2♣ 

1NT – 2♣ 

1♣  – 1♦  – 2NT – 3♣ 

1m (opps) – 1NT o/call – P – 2♣ 

1m (opps) – * (ptnr) – … – 1NT – P – 2♣ 

            2♦         no 4cd M

            2M        4cd suit (with both, bid © first)

Baron [*2]: combined 32+

looking for a fit (incl. m suit) for slam:

2NT – 3♣ 

2♦  – 2♥  – 2NT – 3♣ 

1♣  – 2NT – 3♣ 

            3any     4cd suit

            3NT      4cd♣  suit

both ptnrs bid 4cd suits up the line until fit found

negative double

double of overcall of partner’s opening bid:
shows 8 – 10, any shape, and requires rebid

(other than 1^st round doubles are for penalties)

notes

1. flat hand implies no singleton or void
2. suit lengths, except preempt bids are, generally, minimum holdings (x cds +)
3. =x (points) is x points exactly
4. indent indicates responses to bid above
5. m = minor suits
   M = major suits
   cd = card(s)
   gd = good
   any = any suit (i.e. not NT)
   other = any suit except the one just described