Never think!
Unless you have some remarkably good reason for taking your own course, do as you are told. If your partner leads a small trump, and you win the trick, return it at once:
“Gratia ab officio, quod mora tardat, abest.”
This is a much more simple and satisfactory plan than to proceed to think that he may have no more, or that the fourth player must hold major tenace over him; no one will admit more readily than I do that you are much the better player of the two, still, allow him to have some idea of the state of his own hand.
Don’t think whenever you see a card played that it is necessarily false.—“Nil sapientiæ odiosius acumine nimio.”—Seneca.
As, on the whole, true cards are in the majority, you are more likely to be wrong than right, and the betting must be against you in the long run.
“My business and your own is not to inquire
Into such matters, but to mind our cue—
Which is to act as we are bid to do.”—Byron.