Raising the river with the worst possible hand

Party Poker 10/20 Hold'em (9 handed)

Preflop: Hero is MP3 with 2♥2♣
3 folds, MP2 calls, Hero calls, CO calls, Button calls, SB completes, BB checks.

Flop: (6 SB) 5♦, 5♥, 4♥(6 players)
SB checks, BB checks, MP2 checks, Hero bets, CO folds, Button folds, SB folds, BB folds, MP2 calls.

Turn: (4 BB) 6♦ (2 players)
MP2 checks, Hero bets, MP2 calls.

River: (6 BB) 6♠ (2 players)
MP2 bets, Hero raises, MP2 folds.

Final Pot: 9 BB


Normally I don't put any more money in the pot without flopping my set, but in this hand I bet the flop and turn because I thought it was highly likely I had the best hand. When MP2 called the turn, I figured he probably had overcards and a heart flush draw, but not a good flush draw because he probably would have bet the flop. So he probably had something like T♥8♥. Although a hand like 3♥3♣ or 4♣3♣ also seemed possible.

The river seemed like the worst possible card for my hand, since now I'm playing the board. But when he bet out it seemed like a desperate bluff attempt consistent with a busted heart draw or a pair of 3s. So I took a chance and raised. If he had called my raise, he would have won the pot with any hand except for 43, 33, 42, and 22. Those hands would have won half of it.

I don't know if it was smart, but this bluff won me $177.