mycroft, on 2024-September-06, 09:01, said:
I'm more concerned with the other game with explanations like this - some deliberately phrase their explanations in an incomplete manner to induce followup questions - so *they* get the information. The classic example is ...4NT-5♥ "two keycards". Then wait to find out who asks about the trump queen, in case they have a two-way finesse... Is it possible that this pair don't say anything about the spades to induce questions that will help them place missing spade honours?
I don't think I've encountered the "2 keycards" ploy as such, but then it's a sort of advance-finesse anyway, isn't it? The asker might be staring at the Q or might be wondering if partner is. Of course some of our more deviant pairs do have (at least implicit) agreements about who asks when, but one still has to know them. I guess the real tell might come from their different "table feel"