Throw Your Winner!!!

In a recent tournament, I found an interesting board as displayed below. The bidding is using precision system, South open 1D, North 1H, South rebid 1NT (12-14) and North jump to 3NT. West lead spade, Declarer hold up for 2 round and win the 3rd round while discarding heart from dummy.

		Dummy
		♠ 7 6
		♥ 10 6 5 4
		♦ A K Q 10 9 5
		♣ 6
	You
	♠ J954
	♥ K92
	♦ 43
	♣ A J 43

Contract 3NT. Declarer then run 6 diamond tricks, what's defensive plan?.

A novice defender will give an encourage signal for heart by discarding the ♥9 and then leave the ♣ A alone. Declarer then exit with club to west, who cash the spade and has to play a heart to the fork. Even if declarer can read the position correctly, west actually could beat the contract.

Here are the logic.

West is the victim of the end-play. If declarer hold the ♣K outside of ♥AQ, nothing can be done. Contract can't be beaten. However if declarer just has the ♣Q instead of ♣K, then can throw his winner and retain the ♣Ax. He will win with ♣A and play club to east ♣K who will play the heart through declarer. So, sometimes the winner shall be threw. Here are the complete distribution

	♠ 7 6
	♥ 10 6 5 4
	♦ A K Q 10 9 5
	♣ 6
West		East
♠ J 9 5 4		♠ K Q 3 2
♥ K 9 2		♥ 873
♦ 4 3		♦ 76
♣ A J 4 3		♣ K x x x
	Declarer
	♠ A 10 8
	♥ A Q 6
	♦ J 5 2
	♣ Q 10 7 2