Who has the last trump?

Dealer: N Vul: None Lead: J♥		North
		♠	x
		♥	AQxxx
		♦	ATx
		♣	KQxx
West				East
♠	?xxx(?)			♠	?xxx(?)
♥	KJTxx			♥	xx
♦	(?)xx			♦	(?)Jx
♣	J			♣	T987
		South
		♠	AQx
		♥	x
		♦	K8xxx
		♣	Axxx

West	Dad	East	Me
	1♥	P	2♦
P	3♣	P	3♠
P	4♦	P	5♣
P	6♦	All P

My father and I each pushed a bit, the result being a thin slam.

It seemed to me that if both minors broke 3-2, then the slam was cold on two spade ruffs, and there was no need to take either major suit finesse.

So, I won the Ace of hearts, played Ace and ruff a spade, crossed to the Ace of clubs (noting the Jack), and ruffed my last spade.  The Ace of diamonds was unblocked, and a heart ruffed back to hand.  Finally the King of diamonds, opponents following and a heart discarded from dummy (NOT a club).

At this point I played a club towards dummy, planning to claim with one trump loser if they broke.  However, LHO thought for a bit, then discarded a heart.  When I lead a heart from dummy, RHO had to think (yes RHO showed out, so the heart finesse would have worked), then they discarded a spade (as a club discard would have been fatal).  At this point, I was cold, even though I didn’t know who had the last trump.  So I lead a club towards dummy.  West could not ruff, or my club loser would go away, AND could not discard a heart, otherwise dummy’s Queen would provide a winner for a club discard.

So after their Spade discard, LHO was known to hold the heart King and either the high trump, or a spade.  RHO was known to hold a good club, and either the master trump or a spade.  When I lead a heart from dummy, I was either scoring my last trump en-passant, or via the compression squeeze affected on LHO the previous trick.  Either way, +920 was worth a lot of matchpoints.