Playing in a casual game of bridge, holding JTx of trumps, I "falsecarded" on the second trump lead with the J. Believing that he had drawn them, declarer stopped leading trumps.
Later, I trumped one of his tricks with the T. Declarer protested, saying that I should have followed "in sequence." My partner agreed with him, but dummy just said sagely "My partner forgot to count trumps."
I wasn't "wrong" was I, even though I was "deceptive"?
But I've been told that there are limits. For instance, is "moodying" allowed (act strong when weak, act weak when strong) even though this is a critical element of say, poker?