Precisely 5 cards in the major and 4-5 cards in a minor, below opening strengthThese are basically 5 card weak twos with an escape suit.
Responses:
- 2S over 2H = natural, NF. Opener is to pass with 0-1 spades and raise with 3.
- 2NT = strong enquiry
- 3C = pass or correct
- 3D over 2S = hearts, weak or strong
- 3D over 2H, 3H over 2S = invitational raise in major
- 3M = preemptive
- 3S = natural, forcing
- 4C, 4D = fit-jumps
- 4N = bid your minor
- 5C/D = to play
After a 2NT enquiry:
- 3C = min with clubs
- 3D = min with diamonds
- 3H = max with clubs
- 3S = max with 4 diamonds
- 3N = max with 5 diamonds