checking this river correct?

[Mercantides]

I suggest you review the last hundred hands you took to showdown and examine the river play on each.

Count how many times you:
1) missed a value bet
2) correctly checked when beaten
3) correctly induced a bluff by a hand that wouldn't call
4) made a value bet but got raised*

* This doesn't mean the value bet was incorrect. Sometimes people slowplay or suckout on the river but not often. Even when they do it only costs you 1 bet if you were going to check/call anyways.

This should give you a reasonable idea if you're missing a lot of value bets. I know it helps me. You just have to make sure not to be results oriented.