At matchpoint duplicate bridge, not vulnerable vrrsus vulnerable, and sitting West, I held
♠ AK32 ♡ J643 ♢ 6 ♣ JT82
Partner (East) opened one heart, South overcalled one spade, I raised to two hearts, North bid two spades, and there were three passes, giving me the opening lead.
I led my diamond singleton, and (FWIW) dummy came down:
♠ JT95 ♡ A ♢ JT92 ♣ KQ64
Partner asked me why i didn't lead her heart suit. I pointed out, with the benefit of hindsight, that dummy had a singleton ace, meaning that we would not take tricks in that suit. Even without the "look," I feared that given my partner's and my heart length, one of the opponents would have a singleton (or void).
Given my singleton, I wanted to be able to ruff diamonds with my little spades. I had two trump "stoppers" and I wanted to save partner's (presumed) heart entry so she could lead diamonds.
I might not have done this with the spade KQxx or QJxx because I would need the "little" cards to protect my honors. But here, I thought best use of the 3 and 2 would be as ruffers.
Was I right to lead my singleton? Or was partner right to insist on a heart lead? Or perhaps the mistake was that neither of us bid three hearts earlier?