The infamous river bluff

[SixForty]

Like others said, this is a tough one due to board texture. If Villain actually stops and thinks, he'd see that your play really doesn't make any sense at all. Unless maybe you raised PF with 44. If he has any piece, he calls you down.

That being said, it simply becomes a question of how often Villain has a piece of this board here. You're getting 2.1-1 here on your bluff - if it successful more often than 1 in 3 times, then it's a good bluff. Will Villain have some piece of this board more often than 2 times in 3? This becomes a factor of his hand range (which is probably pretty wide here) and your read on how he played the hand.

From the sounds of your read, it's probably pretty close. I don't mind it - I could go either way.