I didn't really fancy Phil's line after the Q
♣ scores : trying to crash the initial 10x
♣ instead of taking a simple Diamond finesse is an improvement mainly if LHO has 4522, with specifically Jx 10y in the minors. As you already have seen the x and y, this is much less likely than the remaining bunch of 4612 and 4513 that remain after you score the
♣Q. If the
♣10 idea fails, as they need a 5th trick, I don't think strong oppos will offer me the unblocking play before playing a single round of Spades, but what do I know ? Maybe Phil is right afterall. Mmmm... not if the Hearts are 6-4 at any rate

.
What I thought was the point to this hand, was the need of taking the Club finesse just after the 1st Diamond, and just before taking the Diamond finesse. Why ? :
1. the main idea is to avoid a second undertrick if Hearts are 5-5, with the offside King. They will cash 5 tricks only, and you do not need the Diamond manoeuver anymore. If OTOH West has bot K
♣ and J
♦ (4522), you probably are going down 2 if you start with the diamonds ;
2. at first I thought that East would never cover the Q
♣. But in reality, if East play the
♥Jack on the first round, and if he doesn't the
♣Ten, he may think about AQx AQ9 AJxx Txx, in which case ducking the
♣Q is fatal. Mmm but in turn this should NOT happen if they lead 4th best though, so this is probably a mirage.
Oh well, anyway my play is
♦to King,
♣Q,
♦ to Ten, BANZAI !!
S: 3NT
Lead: H4