Explanations:
The 2C was a DONT bid showing clubs and something else, the 2D asked for the something else.
Since I was a passed hand I might have bid a natural but of course not game forcing 2C over 1D instead of 1NT.
My double of 2D was meant to show something like what I had: If pard wants to compete to 3D fine, if not I am happy with a D lead.
What happened:
2H is off one. Yes I think the 2C was aggressive but it's matchpoints and anyway I don't control their bidding.
We can make 3NT but it is pretty lucky I think. With the diamonds coming in there are eight tricks, the heart finesse is on, and if they attack spades, even froom the S hand, the spots are such that they can take only three tricks.
3D seems pretty easy, and in fact it looks as if 4 would be made. GIB agrees. The only pair that played in diamonds in fact made 5.
We have eight diamonds, they have eight hearts, LOTT says 16 tricks but, as is so often the case, LOTT is off by one. 10+7 = 17.
2HX down 1 is certainly better than 2H undoubled off 1 but I have no idea who would be doubling this, even at mps.
I am not particularly interested in apportioning blame here, but I thought the hand interesting and I invite comments.