As an opening[]
A 3♠ opening is preemptive in every system.
As a response[]
To a 1♣/1♦/1♥ opening[]
1♣/1♦/1♥ - 3♠ is a double jump shift, which is either a weak jump shift, showing less than 6 HCPs and 7 ♠s, or a splinter showing support and void or singleton in ♠s.
To a 1♠ opening[]
1♠-3♠ is a double raise, usually a limit raise.
To a 1NT opening[]
The 3-level responses of a 1NT opening have many possible meanings, which depend on agreements.
To a strong 2♣ opening[]
A jump response to a strong 2♣ opening shows a very strong single-suiter and slam interest.
To a weak 2♠ opening[]
A single raise of a weak two bid is preemptive and to play.
To a 3♣/3♦/3♥ opening[]
This shows a strong hand and a self-sufficient suit, and is forcing.
As an overcall[]
A jump overcall of 3♠ is usually equivalent to a 3♠ opening, which is preemptive.
| Bids |
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1♣-1♦-1♥-1♠-1NT |