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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

Departures from the Standard French System

The bidding system used by the program, while implementing the principle of 5-card majors, offers some simplifications to conform to the standard French system.

If the SEF option is invoked:

  • Responder's cue bid with an unpassed hand shows a strong hand with more than 16 total points, but not necessarily a fit

  • The bid of 4NT is always Blackwood, except in the following cases:
    • An overcall of 4NT shows a hand with two suits of at least five cards each. The suits are the lowest ranking suits unbid by the opponents
    • After an opening 1NT or 2NT, 4NT is invitational

  • No fourth-suit forcing, except for bids of 2 ♣ and 2 . In particular, the bid of 1 ♠ in the sequence 1 ♣ - 1   - 1  - 1 ♠ is natural (4 cards)

  • No third-suit forcing

  • After an opening 1 ♣ which is neither raised or rebid, the bid of 2 ♣ by an opponent is always natural except in the protective position, where the sequence 1 ♣ - - 2 ♣ shows a hand with two 5-card majors

Without the SEF option:

The following additional differences will be found:

  • With more than 16 total points, responder jumps in another suit, with or without a fit, unless the pair are using the Bergen convention. In this case the responses of 2 ♣ and 2 are unlimited. Otherwise, a non-jump response at the 2-level shows 12 to 16 total points. A response at the 1-level shows a maximum of 16 total points

  • The 1NT opening may be made with a 5-card major if the distribution is 5332, and the option is checked

  • A bid of 2NT in the protective position has the same meaning as a suit overcall

  • In the sequence 1 minor - 1 major - 3NT, opener's 3NT rebid shows a balanced hand with 18 to 19 honour points and a 6-card minor suit