1N! 1/2 opening: (11)12-14 HCP, BAL
3/4 opening: 11-15 HCP, semi-bal
1N! 2C! stayman, inv or minor S/O (問5M6m)
2D! stayman, often unbal, FG
2M S/O
2N! BAL, w/o 5M, FG
3x inv
3N S/O
4m! SF transfer to 4M
4M S/O