jillybean, on 2022-November-16, 20:13, said:
Thanks, how does South bid with a 3523 hand, unsuitable for nt.
4SF at 3C? The issue is so still bid 3NT with xxx facing xxx (as 5m loses 3 obvious tricks after pinpointing the lead). But here it is very hard and known as the diamonds issue. You can confirm or ask everything below 3NT over clubs, but not over diamonds. I guess responder here can bid 3H or S as either natural, i.e. honor doubleton and 5-cd, respectively, or a problem with C.
That is similar to 1H 2D 3D 3H = natural fit, SI, or C stopped, but not S. Always hard to navigate.