bridge winners上正好在讨论二盖一中开叫人再叫自己的花色保证什么,一般性的共识是什么也不保证。 参见:http://bridgewinners.com/article/view/rebidding-2m-after-a-21-response/ Phillip Martin: "One of the arguments originally advanced for playing five-card majors was, “You'll never have a rebid problem after a two-over-one. You can always just rebid your suit if you have to.” So it's amusing that we're now back to having rebid problems again. Maybe we should try playing six-card majors."