[Cyberyeti]

 KingCovert, on 2019-August-22, 14:42, said:

A heart comes at Trick 3, are you ducking to the Q♥? You're never doing that. Win the Ace, and now what? 4-0 trump break kills you.
West lead their 5th best ♦ and wins the 2nd round of diamonds giving East a trump promotion/over ruff, the ♦ lead was made because West was holding the K♥ (per your agreements) and a void in ♠.
Your line of play can certainly be right, it's a good line of play if you believe that ♦ are breaking 6-1, the question is whether it's the correct to play for the 6-1 diamond break given what you know.

You have to VERY much respect the W player to consider this, down the club, will not ever happen.

The ♥K being onside does not guarantee making the contract btw, you can't draw all the trumps before cashing ♥Q so a 5-2 heart break puts you in a tricky place.

[HardVector]

 cherdano, on 2019-August-22, 04:16, said:

No, but nobody leads low from QJ9xx against a small slam, and East wouldn't play the T from QT at trick one. We only have a guess when East follows with the J or maybe the 9 at trick two.

I'm with Yeti here. With the 6♦ lead, I'm just worried about it being a stiff, and E having QJT987♦. With that holding, they could play any of 6 cards with the same effect.

[cherdano]

 HardVector, on 2019-August-22, 20:16, said:

I'm with Yeti here. With the 6♦ lead, I'm just worried about it being a stiff, and E having QJT987♦. With that holding, they could play any of 6 cards with the same effect.

I stand by my recommendation to read posts before replying to them.