2N 3C
3N 4C!
4D! a 4m
4H! 5C (4S!=C RKCB, 4N=to play)
4S! 5D (4N=to play, 5C!=D RKCB)
4N w/o 4m
2N 3C
3N 4C!
4D! 4H! 4C, may w/ 4D
4S! 4D w/o 4C
2N 3C 2N 3C
3N 4C! 3N 4C!
4D! 4H! 4D! 4S!
4S! 4C fit, C RKC 5C! 4D fit, D RKC
4N misfit, 4D w/o 4C 4N misfit, 4C w/o 4D, S/O
(5C!=4D fit, D RKC, 5D=inv 6D)
5C inv 6C 5D inv 6D