Inverted Minors - folksbridge21/system2 GitHub Wiki
- 1m-2m: Inverted minor, 4张梅花可以加叫，不逼局
- on with passed hand, off after takeout X, off after overcall
- 2D = 2-3 card C， 一定先报张数 （2022-04-04 晓群讨论）
- 2H = GF(14+) semi-BAL 半均型逼局（2245）1c-2c-2h, 5c/4h/4s/4d (at least have 4c+)
- 2S = Min un-balanced 低限非均型 (2N ask shortness): 1c-2c-2s-2nt: 3d/3h/3s , short (at least 4c+)
- 2NT = Max(18+ hcp), balanced, forcing 高限均型 (at least 4c+)
- 3m = Min Bal 低限均型, 1c-2c-3c (4+ min)
- 3 new suit = Max un-balanced (short in the bid suit) 高限非均型 1c-2c-3d/3h/3s)
- 3NT = to play, 14-15 hcp, balanced 1c-2c-3nt, 4c+, 14-15