Flannery 2♥

Like 1♣-2♥, 1♦-2♥ is Reverse Flannery. It shows constructive 4+♥, 5+♠.

1♦-2♥-CONST, 4+♥, 5+♠
P, 2♠S/O
2NT!LEB
3♣!FG, 2+♠
3♦!FG, 3+♥
3♥INV, 4+♥
3♠INV, 3+♠
3NTS/O

BTU Ekren + Lebensohl becomes even more useful after the 1♦ opening. When opener wants to play 3m, they can have either long diamonds or a two suiter in minor suits. Responder assumes a 5-5 two suiter first, and then opener can pass or correct.

1♦-2♥-2NT-LEB
3♣3–4♣, 0–1♦, 54(xx)
3♦2–4♦, 0–2♣, 54(xx)
3♥5+♥
3♠6+♠
1♦-2♥-3♣-FG, 2+♠
3♦!54(xx), at most partial stop in ♣
3♥5+♥
3♠6+♠
3NT54(xx), likely stop in ♣
1♦-2♥-3♦-FG, 3+♥
3♥!54(xx), at most partial stop in ♣
3♠6+♠
3NT54(xx), likely stop in ♣