MPs. Table result 4S? Lead K♥
SB is a keen reader of these columns and picked up a clever ruse from another thread (to which he gives his thanks) and he was quick to put it into action on this third director call in one round (!) from the recent North London Individual. Against the normal spade game, with RR North this time, CC led the king of hearts, and SB quickly saw a significant extra chance, which would put the contract in the 75% area. He won with the ace, ruffed a heart, and cashed only three rounds of trumps at fair speed, East discarding a small club, discouraging, and a heart, before advancing the two of clubs. CC was expecting the fourth round of trumps to be drawn (as SB never miscounts trumps) and had partially detached the nine of spades, but realised in time and replaced it with the seven of clubs. SB played the king and was one down.
"DIRECTOOOOR", SB bellowed. "There was a BIT by CC in a particularly sensitive situation. West could have known that partially extracting one card and replacing it with another would cause me to place him with the ace of clubs, and I think that Law 23 applies. With the ace, he would have not known whether I was 8-1-3-1 or 8-1-2-2 and he would have had a problem. With Qx he had no such problem."
How would you rule?