[helene_t]

In Standard American, "nothing" is forcing. In SEF, a new suit at the 2-level is not but at the 1- and 3-level it is. This treatment is quite popular in the Netherlands.

But of course, after an overcall of a preempt, a new suit is forcing.

[han]

If the opponents open with a preempt, partner overcalls, and I respond in a new suit, then that has to be forcing in any system. I think that anybody who has considered this issue seriously must come to the same conclusion.

100% to both players for me as well. I think that 3S is the worst call, 3C close second, 4C normal (what else?), and 5C understandable (can partner really have 5 hearts? If not then 4H is a cuebid and 5C the weakest possible call.)

[whereagles]

Whether or not a new suit is forcing after an overcall is a matter of agreement. Most people want to keep the cue as "good raise", which kinda forces a new suit to be the only forcing bid in misfit cases.

[HeartA]

Thanks for all the responses. I will take new suit at 3-level as forcing from now on.