Law 46 B
Something that arose recently, but had no consequencies to the result, has caused a bit of a dilemma. The problem is about "(except when declarer's different intention is incontrovertible)".
Declarer leads (say) a club towards dummy. There are no Clubs in dummy and dummy only has the 9 and 6 of trumps. Declarer says (at the same time as LHO plays the 10 of trumps) "ruff..ah ". Has declarer called a card and a trump is "deemed" to have been called and a low trump should be played or is it an incomplete or invalid designation of a card and a change of card can be made?
As I have said nothing "hangs" on this but just wanted to be sure in my own mind.