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Play bridge with Wbridge5!

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Wbridge5 Conventions
Available systems
Hand evaluations
Opening Bids
Up to 2NT
Pre-emptive
Responses to openings of: 
1 of a suit
1 NT
2 ♣
2 , 2, 2 ♠
2 NT
Responses to Stayman
Opener's rebids
Competitive bidding
Intervening bids
Doubles
The Sputnik double
Michael's cue-bid
Options
Optional conventions
The weak two
Suit agreement
Games and slams
Departures from the SEF

Responses to a 2NT opening bid

Pass Less than 5 High Card Points (HCP)
3 ♣ Stayman - hand must contain at least one 4-card major
3 Jacoby transfer - hand must contain at least five Hearts
3 Jacoby transfer - hand must contain at least five Spades
3NT 6 - 11 HCP
4 Shows two 5-card majors - opener then shows preference
4 ♠ Shows two 5-card minors - opener then shows preference
4NT 12 plus HCP

The Jacoby Minor optional convention

3 ♠ At least 6 Clubs and less than 5 HCP. Opener rebids 4 ♣ and responder passes
At least 6 Clubs, a singleton or void and at least 5 HCP. Opener rebids 4 ♣. Responder shows where the shortage lies by bidding as follows:
  • with a shortage in Spades
  • 4 ♠ with a shortage in Hearts
  • 4NT is Blackwood

If responder believes a slam is possible he shows any first or second-round control

4 ♣ At least 6 Diamonds and less than 5 HCP. Opener rebids 4 and responder passes
At least 6 Diamonds, a singleton or void  and at least 5 HCP. Opener rebids 4 . Responder shows where the shortage lies, or shows controls, as for the major suit responses to the 3 ♠ bid above. Alternatively, with an interest in slam, responder can bid 4NT which is Blackwood

Note that the Jacoby Minor over 2NT, and Gerber, are mutually exclusive