Partner led a 4th best at NT and You played an Honor to that first trick . shortly after you are in hand and play back partner's suit. Usually you should play current count of the remainder....but this is true only 90% of the time. main exceptions types are: either for unblock reasons either for overkill reasons(partner will have difficulties to believe you have 9 or 10 cards together in the led suit could anyone document with real life examples or theory?