Your hand is a tricky 4-4-4-1 shape. Most experts recommend opening the middle suit except when the singleton is diamonds (4-4-1-4) when you open 1C. With 15+points you have more options since you can rebid NoTrump if partner bids your singleton. Open 1D. Rebid 3H and then 5D.
Acol Bidding
Your hand is a tricky 4-4-4-1 shape. Most experts recommend opening the middle suit except when the singleton is diamonds (4-4-1-4) when you open 1C. With 15+points you have more options since you can rebid NoTrump if partner bids your singleton. Open 1D. Rebid 3H and then 5D.
Plan Before You Play
Dummy goes down and you feel cross that North didn't try to support your hearts. Count your losers. None in spades and hearts 1 in diamonds and 1 in clubs. Draw trumps and play the side suit winners.
The Play
Lose the club lead, and ruff the club return. Draw 1 round of trumps leading out the AD when the KD drops you can be certain that east has the other 3 diamonds. Plan to draw all the trumps and play your heart suit discarding low spades.
Comment
For 12 tricks. This hand makes 6H and 5D! Which score do you want to get?
The above commentary is intended as a guideline only. As with any Bridge hand there are many ways to bid and play any hand.