[2200]

trump preference

Those of you would know that sometimes, auction like 1S-1NT-2C-2S, responder could have singleton spade(but at least doubleton most of the times), just to maintain the bidding for one more round.
Not so at 5 level.
Holding 5 clubs to the A109xx， GIB decided even after pd volunteer 5C, it is far from being enough, and better make "trump preference" to the singleton suit.

[manudude03]

As bizarre as it seems, if you look at the explanation of 5C, apparently it doesn't promise support. I guess that's why.

[2200]

manudude03, on 2021-August-13, 19:25, said:

As bizarre as it seems, if you look at the explanation of 5C, apparently it doesn't promise support. I guess that's why.

Thanks. I didn't notice that.
So, GIB does not allow you, to support with support, to showing trump support, but bidding it?

[johnu]

Quote

GIB created a new record by making trump preference with stiff

IIRC GIB has passed a preference bid with a void (when holding fantastic support for the other suit).