Foster Echo

Against a NT contract, when 3rd hand cannot win the trick, 3rd hand is expected to unblock the 2nd highest card. With 4+ cards, 3rd hand plays second, third and finally lowest card. With three cards, 3rd hand plays second, and then lowest card. For example: Partner leads the 4 of spades (4th best leads) against 3NT, dummy has K72 of spades, declarer calls for the King which holds.

Your spade holding is:

J95 play the 9 and next play the 5 T65 play the 6 and next play the 5 9853 play the 8, then the 5 and finally the 3 Q9653 play the 9, then the 6 and finally the 3 T4 play the 4 and then the Ten The Foster Echo thus shows count while retaining the highest card (if needed later).

Of course, the downside of playing Foster Echo is that the second highest card may be an important spot card.