With only us vulnerable at matchpoints, I oponed one heart after dealer passed. The second opponent passed and partner had the following for a response: ♠ AQJ74 ♡ 742 ♢K754 ♣ 7.
I would have expected a one spade bid (one over one) from him but he felt that it was more important to show his heart support.
More to the point, he raised to three hearts (invitational).I raised to game and we went down one, because I believed that he had more strength than he actually had. Specifically, I would have expected either a fourth trump with ten high card points, or at least twelve high card points with only three trumps. And his "three" was pretty nominal. (So, in all fairness, was my five, with A8653; we each had minimum trump strength.)
Was partner right to bid hearts instead of spades? And if hearts, was two hearts or three hearts the better bid?