Third Hand Play - should you return your partner's suit or switch to a new suit?

Here are the hands played during the video:
1. You win the first trick. As you have control of the diamond suit, the right play is to continue spades. You plan to knock out the only entry to dummy, and then hold up your ace of diamonds tinyurl.com/y5... POLL 1 Play at trick 2
2. That suit in dummy is likely to run, (declarer or partner has QD) so switch to dummy’s weakness tinyurl.com/ny8... POLL 2 Play at trick 2? (Down 1). There is a clue from the bidding to attack clubs rather than hearts.
3. With that long suit in dummy, switch to a heart to knock out dummy’s entries tinyurl.com/k8j... POLL 3 Play at trick 2?
4. East starts by signalling encouragement, but then must overtake in order to lead into dummy’s weakness tinyurl.com/ycj...
5. Hand 3: Only 50% defeated 3NT: tinyurl.com/y9d... POLL 4 Play at trick 2?
6. You must overtake KD at trick one to lead a club. No one found this defence: tinyurl.com/2e... POLL 5 what to play at trick 1?

[@ashamokhariwale6465]

Excellent analysis. Thank you so much.

[@TonyStawBridgeClass]

You are very welcome. Thank you for the feedback!

[@andrewwebb4635]

I wish I could double-like your videos! They are so chock full of intelligence and thoughtfulness. Though I’m 2 months later watching this so may have missed the boat, I’m wondering where you stand on Andrew Robin’s advocacy of the opening lead being ‘Low for Like’ or ‘High for Hate’? It runs against signalling a doubleton but Andrew doesn’t recommend leading from this in suit contract either. Otherwise it seems to me to have a lot of merit. But what do you think?

[@TonyStawBridgeClass]

Many thanks for your kind remarks. Yes, I recommend that you lead low to indicate to suit or lead high if you do not ua-cam.com/video/V-gJLAy44Vw/v-deo.html

[@paulbernadini431]

Thanks!

[@TonyStawBridgeClass]

Much appreciated. Thanks