※ 引述《leondemon (狗狗)》之铭言：
: 最近在开发新的叫牌制度
: 一般来说5张Spade/Heart分别开叫1S/1H
: 想问一下 有没有5张Spade/Heart分别开叫1D/1C的人为叫品制度？
龙桥或Tresboof2003都是使用这类型的开叫，
但是Tresboof是HUM，所以开发完也只能孤芳自赏，
P: 14+, any shape.
1C: 8-13, 4+ hearts, h>=s, possibly longer minor, possibly 4-4 majors.
1D: 8-13, 4+ spades, s>h, could contain 4+ hearts, possibly longer minor.
1H: 0-8, any shape. Usually no 5-card suit except possibly clubs.
1S: 9-13, balanced, no 4cM unless 4-3-3-3.
1N: 9-13, 5+ diamonds, no 4cM. (Implies 6+ diamonds and/or 4 clubs).
2C: 9-13, 5+ clubs, no 4cM. (Implies 6+ clubs and/or 4 diamonds).
龙桥是吕昌所著，可以上网搜寻一下，我只记得1C/1D=4+H/S，1H/1S=4+C/D（印象中）
可以自行参阅。