Full Tilt Poker $10 + $1 No Limit Hold'em Tournament - t15/t30 Blinds - 8 players
The Official 2+2 Hand Converter Powered By DeucesCracked.com

MP2: t2520 M = 56
CO: t1320 M = 29.33
BTN: t1440 M = 32
Hero (SB): t1620 M = 36
BB: t1945 M = 43.22
UTG: t1350 M = 30
UTG+1: t1500 M = 33.33
MP1: t3750 M = 83.33

Pre Flop: (t45) Hero is SB with 2 5
2 folds, MP1 calls t30, MP2 calls t30, CO calls t30, 1 fold, Hero calls t15, BB checks

Flop: (t150) 6 2 3 (5 players)
Hero?

Doubt there's a huge difference between leading/never folding and check/raising/never folding. I'm more inclined to c/r, and it's not really a terrible outcome if it checks through.

Isn't RIO a concern 5-way? If not, is it because of effective stack sizes?

If we aren't worried about it, then I would bet flop to keep sets in my range for when I barrel the turn.

Correct, RIO is not an issue here. We are around 30BB deep effective. We'll play it like we have the nuts.

What is an RIO? something about a bigger FD?
Bet pot or close to pot and try to get it in here, or C/R and try to get it in.

But I fold pre fwiw

Yeah, basically. With draws, implied odds are when you make a small investment now to win more chips when you make a hand. RIO is "reverse implied odds," and, really simply put, in this type of situation, it means you're making a small investment now to LOSE more chips when you make a hand.

RIO is the idea that you're either going to win a small pot (you make your flush, but villain won't pay us off) or lose a large pot (you make your flush, but villain has a better flush and takes your entire stack).

RIO matters in other situations, too. For example, you're oop with a one-pair hand and a pretty deep stack, and you're facing action on the flop... you could stick around, but you're going to face greater and greater bets on future streets and not know where you stand. Even though you might be ahead on the flop, you're sure you can't get to showdown with a large pot and win, and, if you do win the hand, you're usually winning a small pot.

That means the chips you invest on the flop can have a particularly negative expectation because you may be of a) putting more chips in as a dog on future streets, as well or b) winning only the current pot size.

So in this case, imagine that we were actually 400BB deep instead of 30BB deep, and we made a flush. If the final pot was 800BB (i.e. we're heads up and all-in), then you can be pretty confident we're going to have the worst hand.

I'm cool with w/e, turn is where it may get interesting.