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Flannery Convention

Developed by William Flannery to show a hand with 5 cards of Hearts and 4 cards of Spades having 11-15 HCPs so which can not reverse.  2 Diamond openning shows such a hand. The responses are as follows:

Opener

Responder

Explanation

2 Diamonds

Pass
2 Hearts
2 Spades
2 NT
3 Clubs
3 Diamonds
3 Hearts
3 Spades
4 Clubs
4 Diamonds
6 cards of Diamonds, weak hand
Hearts support, weak hand
Spades support, weak hand
Asks for minor distribution
6 cards of Clubs, 11+ points
6 cards of Diamonds, 11+ points
Hearts support, invitation to game
Spades support, invitation to game
Transfer to Hearts
Transfer to Spades

Rebids of the opener over 2 NT response are as follows:

Opener

Responder

Opener

Explanation

2 Diamonds

2 NT

3 Clubs
3 Diamonds
3 Hearts
3 Spades
3 NT
4 Clubs
4 Diamonds
3 cards of Clubs
3 cards of Diamonds
11-13 points 2-2 Minors
14-15 points 2-2 Minors
14-15 points 2-2 Minor, high cards in minors
4 cards of Clubs
4 cards of Diamonds

In the defense against Flannery, a suit overcall in 2nd level shows a triple suited hand on which the overcall suit is the shortest. Suit overcall in 3rd level is natural. Double indicates a hand capable to open 1 NT. 2 NT overcall is just like a Cue-Bid showing the minors.