Minor-oriented openings

General

The minor suit openings in Strong Club System are 1S and 2C showing 10-14 HCP. The former opening bid shows at least four diamonds, denies a major suit, but it could hold any number of clubs. The latter opening bid shows at least six clubs and denies any other suit. The limited nature of these hands often makes it very easy for responder to determine that the opening side has little (or no) play for game, and responder will often take an action that is a suggestion of a final contract. Additionally the knowledge responder has of the opponents' major suit fit(s) will sometimes allow him to violate agreements for tactical reasons.
After these openings, natural non-forcing bids in the other suits are used, together with a relay bid and an assortment of raises.

Responding to the 1S opening

After 1S

A game-invitational or better relay, natural non-forcing new suit and notrump bids, non-invitational raises and fit-showing jumps are available.

2C Game-invitational or better relay
2D 2-suited with 5+D and 4+C (symmetric continuations)
2H 2-suited with 4D and 5+C (symmetric continuations)
2S+ 1-suited with 6+D (symmetric continuations)
2D Natural, non-forcing 3-4D
2NT 5+D, maximum, unbalanced
3C 4+D (5)6+C, maximum, non-forcing
3D 6+D
4D 7+D
2H Natural, non-forcing (5)6+H
2NT 2H maximum
3C 4+D (5)6+C, maximum, non-forcing
3D Good 7+D, maximum, non-forcing
3H 3H minimum
3S 0-1S 3H maximum
3NT Impossible
4C 0-1C 3H maximum
4H 3H maximum unwilling to splinter
2S Natural, non-forcing (5)6+S
2NT 2S maximum
3C 4+D (5)6+C, maximum, non-forcing
3D Good 7+D, maximum, non-forcing
3S 3S minimum
3NT Impossible
4C 0-1C 3S maximum
4D Good 6+D, 3H maximum, non-forcing
4H 0-1S 3S maximum
4S 3S maximum unwilling to splinter
2NT At least 3+D 3+C, wanting to play in opener's preferred minor, not invitational
3C Natural, non-forcing 6+C
3D Good 7+D, maximum, non-forcing
3NT Solid 6+D, maximum
4C Shapely 3+C invitational
4H/4S 0-1H/S 3+C maximum
5C Maximum 4+C
3D/4D Not invitational, wide-ranging
3H/3S/4C Fit-showing jump, 6 cards in the suit bid and 3D
4NT Both minors, requesting opener's preferred minor
Games To play

Responding to the 2C opening

After 2C

A game-invitational or better, natural non-forcing new suit and notrump bids, natural invitational 2NT non-invitational raises and fit-showing jumps are available.

2D Game-invitational or better relay
2H Minimum, 1-suited with 6+C (symmetric continuations)
2S+ Maximum, 1-suited with 6+C (symmetric continuations)
2H Natural, non-forcing (5)6+H
2NT 2H maximum
3C Good 7+C, maximum, non-forcing
3H 3H minimum
3S 0-1S 3H maximum
3NT Impossible
4C Good 6+C, 3H maximum, forcing
4D 0-1D 3H maximum
4H 3H maximum unwilling to splinter
2S Natural, non-forcing (5)6+S
2NT 2S maximum
3C Good 7+C, maximum, non-forcing
3S 3S minimum
3NT Impossible
4C Good 6+C, 3H maximum, forcing
4D 0-1D 3S maximum
4H 0-1H 3S maximum
4S 3S maximum unwilling to splinter
2NT Natural, invitational
3C/4C Not invitational, wide-ranging
3D Natural, non-forcing 6+D
3NT Solid 6+C, maximum
4C Good 7+C, maximum, non-forcing
4D Shapely 3D invitational
4H/4S 0-1H/S 3D maximum
5D Maximum 3D
3H/3S/4C Fit-showing jump, 6 cards in the suit bid and 3C
4NT Both minors, requesting opener's preferred minor
Games To play

Competitive Bidding

When the opponents compete before a relay auction has begun, then if the relay bid or the double of it is available, then that call is for relay. A redouble of the 1S denies tolerance to play in that suit and a clear alternate strain to suggest. It neither shows nor denies values. A redouble of the 2C opening bid shows tolerance to play in the current contract and interest in penalising the opponents. All doubles by responder are penalties. At opener's first opportunity to double, when responder has been silent, double shows a maximum with 0-1 in the opponents' suit and 3+ in all unbid suits. All other doubles by opener are general takeout until either hand describes a long suit, shows a second suit, indicates balanced or semi-balanced nature, or makes a takeout double.
After any raise, doubles of suit bids by responder are for penalties. A double by opener at his first opportunity strongly suggests bidding on but without the freak needed to break the captaincy held by responder.
Jump bids in new suits remain fit-showing, non-jump suit and natural notrump bids remain non-forcing. Raises are not constructive. Bids in the opponents suit(s) are game-forcing. In various esoteric auctions where fit is known and further competition possible, jumps (and non-jumps that can't be natural) are fit-showing to empower partner's further actions in competition.
2NT bids in competition normally show two places to play, particularly in smouldering 2-level auctions when double would be for penalties. In any case, 2NT is never natural in competition. 4NT at responder's first call asks for responder's preferred minor suit in context.
Except where already defined above, 4NT in a competitive auction is RKCB whenever that is possible, and suggesting two possible strains at the five level whenever RKCB is not a possible interpretation. An unnecessary jump to five of opener's suit asks for control of their suit (partner cuebids holding first-round control, and raises holding second-round control).
When the opponents compete after a relay auction has begun, then the agreements used are identical to those used after interference during 1C auction. In particular all doubles by relayer (and opener if relays have been broken) are for penalties.