Your sentence doesn't sound quite right to me. I would use "if". Your rule may have some validity for "provided that", but I'm not sure about "given that".
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MustAskThanks!So the way I understand this is thatHe would have been fine, provided that he had held his nerve. --- incorrectbut the sentence you provided He would be fine, provided that he held his nerve ---- correct?Yes. I can't really accept the first sentence as correct.