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Having 9 trumps is no guarantee your side has 9 tricks.
Even when your side has 20 points the expected tricks can be
fewer than 9.
4=4=2=3 facing 3=2=2=6 with 20 HCPs
The expected tricks is 8 2/3.
One of the two partners must hold a singleton before the
expected tricks is greater than 9.
Once, I knew a man who went down white white at MP in 3C with half the deck and 9 clubs. He was distraught, until he learned that he got a good score, FOR GOING DOWN!!!!, because the opponents could make something.
I knew another man once, who was in 3C with 9 clubs and half the deck, white white at matchpoints. Amazingly, the opponents could not make anything, and neither could he!!! But his idiot opps saved him, with 9 diamonds, by bidding 3D.
Another time, it must have been the same hand you're talking about, I knew of an RHO who doubled 2C with 4342. Now, his partner could not take a joke over the 3C raise and bid 3H with 2452. Now, they played four diamonds, because of my raise.