Look at all four hands and the auction. Who made the most egregiously bad bid?
I think it's a tough choice. Everyone at the table (except my partner) is overbidding like crazy. What was West's 3S? And why is East raising to 4H? And look at me -- bidding 5D with an aceless wonder and no two pictures in the same suit! On the other hand, is partner underbidding? Should he have raised to 4S?
A diamond lead now should lead to one down. But the opponents defended the only way I could make my inane bid. West led the Ace of hearts, then switched to his diamond. This is an obvious singleton since East can see the deuce in his hand. Yet, when he was in with the ace of trumps (I'd run my jack), he led back a heart and I quickly pulled trumps, and dropped my losers on the long diamonds. 5S making was naturally a top board.