Blind vs blind. 3-bet bluff river.

[Raist0000]

Well, now I think about that, my line of betting the river wasn't very good. I thought it was a bluff, but it's very difficult to fold a better hand, I think it's much better to check-call to try catch a bluff. Or perhaps check-fold?

If I bet, he can have these hands:
1) High spade or full house: he's going to raise me and is never going to fold
2) Low spade: he's going to call me for sure
3) A 5 or a K: he's going to call me for sure
4) A J: he is usually calling
5) A pair of threes, like me. Perhaps I can bluff out this hand.
6) A pocket pair, 44 for example. Perhaps I can bluff out this hand, but is unlikely because he not 3-betted me preflop.
7) A total bluff. Versus a total bluff there is no point in bluffing, unless we know he's going to bluff-raise us, because we gain one extra-bet (if the raise is not with a high spade, of course).

So it's true, betting is nearly pointless.