At a club game, East was declarer at 3N. He is a solid A player.
Opening lead was ♠4 and dummy came down with
Dummy was placed with the spades on declarer's left, followed by diamonds, clubs, hearts.
The first trick went 4, T, J, K. Declarer then played the ♠2 and said "Ruff with the ten."
(Declarer was thinking the contract was 6♦ after a brief discussion of that possibility after the auction).
The ♦10 is the only 10 on the dummy now.
How would you rule based on Law 46B?
Plus... it's free!