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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

Intervening bids

Cue bid with more than 20 points if the option Michael's Cue Bid is not activated, otherwise double

Overcall 1NT with a hand whose shape would qualify for this opening, containing 16 - 18 HCP and a stopper in the suit overcalled. Further bidding will be similar to that following a no-trump opening, including the use of Stayman, Jacoby transfers and Texas Minor

Jump overcalls, at the 3- or 4-level on the first round, have the same meanings as pre-empts

A non-jump overcall at the 2-level promises at least a 5-card suit and 12 - 17 points; a jump overcall shows at least a 6-card suit and less than 10 HCP

An overcall at the 1-level promises at least a 5-card suit and 10 - 17 points

The take-out double is made only on the first round of bidding. If made at the 1-level, it requires a minimum of 13 points, or at least 16 points at a higher level. All other doubles, with the exception of the Sputnik double are for penalties

After 2 passes, the point count requirements for the 1NT overcall and the take-out double can be reduced by 3 points

The double of a strong opening 2 ♣, 2 , or 2NT shows a hand with two 5-card majors

Overcalls of 2NT, Michael's Cue Bid, and 2 ♣ Landy are optional