I just instituted a new category, namely "Entries", and so I thought I'd inaugurate it with a daily hand where entries are key to making the hand, and a failure to handle them properly led to this declarer's being down 3, when the opening lead allowed an overtrick. [For a short time, I had a daily hand.] The overtrick comes from a lucky lie of the diamonds and requires careful observation of the fall of the cards. But twelve winners are apparent -- and certain -- from the beginning, and declarer only had to manage his entries with a little more care.
The opening lead was a diamond as noted. Declarer now cashed the ace and king of clubs and . . . The ace and king of clubs! ! ! Why, why, why? Now he can't make the hand -- or so I at first thought. Actually, he can if he'll go to the Q of clubs, come back with a second diamond, run clubs, overtake the K of spades, and now run diamonds, making by a very lucky break in that suit after digging himself into a hole. But a declarer who digs that hole in the first place is unlikely to see that way of getting out. And this does require squandering a spade winner.
I've called a suit like the clubs here a "communication suit," by which I mean the suit offers communication between the hands and should not be messed with until the other suits are all sorted out for winners! You don't wanna touch clubs until you've done all you can in the other three suits. The hand is really very simple. Unblock the diamonds and spades, go to the Q of clubs, your only entry aside from overtaking the K of spades, and run diamonds, which by chance allow four winners, as just mentioned, and now run clubs for an overtrick: 7 clubs, two spades & four diamonds.
So I would say, let those certain winners stay, those that you've always got access to, until you've sorted out all your potential winners Here you must unblock the top spade and diamonds in the closed hand, for you don't "always" have access to the winners in those two suits. After unblocking, then go the Q of clubs. That's a good reason for using a top honor, i.e., to access other winners. Then run clubs. Bid & made with an overtrick (without a heart lead).
Anybody can see at a glance that the diamond suit is blocked. You've gotta use an outside suit to cash the queen of diamonds. No if's, and's or but's. The spade suit is "partially" blocked, I believe I've seen it termed (i.e., you can overtake the K, as opposed to a stiff A opposite K J 6, which would be full blockage), but though can overtake, you don't want to spend two honors on one trick if you can help it.
How on earth can cashing top clubs, any clubs be important early in the hand? I just don't understand. You've always got 'em.
A J 8 4 2
9 
Q 9 6 5
Q 9 4