As an opening Modifier
The most common use of a 2♠ opening is a weak two bid, with a strong preempting power. Common requirements are 5-11 HCPs, a good 6-card ♠ suit and little defensive power (i.e. without side aces or voids).
Alternatively, it may be a strong, forcing, natural opening (strong two bid), requiring at least a 6-card ♠ suit and at most 1.5 tricks short of game.
As a response Modifier
- A single raise of 1♠-2♠ commonly indicates 6-9 HCPs and a fit of 8 cards of more. It is non-forcing.
- After partner's 1-level opening, a jump response of 2♠ is a jump shift. If it is a weak jump shift, it indicates a 6-card ♠ suit and less than 5 HCPs. If it is a strong jump shift, if indicates at least a good 5-card ♠ suit and slam interest.
- After a strong 2♣ opening, a 2♠ response commonly indicates 8+ HCPs and a good 5-card ♠ suit or a 6-card ♠ suit. If steps response are used, it is a slam inviting response.
- After a 1NT opening, the response of 2♠ may have various meanings:
As an overcall Modifier
If the overcall is a non-jump bid, it is a simple suit overcall, indicating about 12-16 HCPs and a good 5-card ♠ suit. If the overcall is a jump bid, it is usually a weak jump overcall, having the same meaning as the opening bid.