This is a most interesting deal from the Nordic Junior Teams Championship over the Easter holidays. Only one pair bid the excellent grand slam in diamonds. Mind you, it is not that easy to get there when you are off one ace.
I could have given you the hand as a single dummy problem (only declarer's and dummy's cards exposed), but that would likely have been too difficult in the forum for mainly intermediate players.
Declarer got a heart lead to the king and eventually went one down because he was unlucky to find a 4-1 trump break. He lost a trick to ♦J.
Could he have landed the grand slam, and if so, how should he have played the hand?
(advanced or better players, please make your posts hidden if you feel like contributing).
Roland

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South 7D
Lead: H6