Here's a hand I just played. I only had 70 hands on villain, but he was opening a ton of pots and playing pretty spewy since I was at his table. A few hands previous he 3bet 10s in the BB vs my iso-raise and instant 1/2 potted a Jxx flop.

I opened in MP w/ a pretty decent stack size, 12/25 in the tournament. Villain made a pretty standard BTN 3bet and I decided to see a flop rather than 4bet (due to stack sizes, etc). Villain makes a suspicious bet on the flop, which I pretty much expect him to do with any air, draw, and some underpairs. I decided to click it back to charge his draws extra. In hindsight (as I rarely if ever make min raises), call probably would have been better--though I wouldn't know how to proceed if the flush came. Villain flats, the turn is pretty bricky, and villain jams behind for a little over a psb effective.

At this point, I think villain definitely has some 2P {A5s, A3s}, and TP combos {AK, AQ}. Villain also only really has {AA} as pocket pairs go, and also a myriad of bluffs {78s+, KQs, XX.. etc}. Hoping someone can help me shed some light on this spot.

Winning Poker Network (Yatahay) - 2,500/5,000 NL - Holdem - 8 players
Hand converted by PokerTracker 4

UTG+1: 33.14 BB (VPIP: 18.37, PFR: 17.07, 3Bet Preflop: 7.14, Hands: 49)
Hero (MP): 28.62 BB
MP+1: 39.62 BB (VPIP: 30.00, PFR: 12.50, 3Bet Preflop: 9.30, Hands: 80)
CO: 11.82 BB (VPIP: 20.83, PFR: 13.04, 3Bet Preflop: 0.00, Hands: 24)
BTN: 55.98 BB (VPIP: 40.00, PFR: 37.93, 3Bet Preflop: 30.77, Hands: 70)
SB: 42.29 BB (VPIP: 26.67, PFR: 6.67, 3Bet Preflop: 10.00, Hands: 15)
BB: 5.55 BB (VPIP: 12.50, PFR: 13.33, 3Bet Preflop: 0.00, Hands: 16)
UTG: 18.51 BB (VPIP: 13.33, PFR: 6.67, 3Bet Preflop: 0.00, Hands: 15)

8 players post ante of 0 BB, SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 2.3 BB) Hero has J A

fold, fold, Hero raises to 2.07 BB, fold, fold, BTN raises to 5.28 BB, fold, fold, Hero calls 3.22 BB

Flop: (12.87 BB, 2 players) 5 6 A
Hero checks, BTN bets 3.22 BB, Hero raises to 6.43 BB, BTN calls 3.22 BB

Turn: (25.74 BB, 2 players) 3
Hero checks, BTN bets 44.16 BB and is all-in, Hero?

would check/call flop

check/call turn

c/c river against crazy guy

I agree, and I would classify 40/38/31 over 70 hands as pretty crazy. Let these guys bet into you.

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You are putting yourself in a bad spot by clicking back the flop, because you fold out a lot of the hands you want villain to have here. As played I think I fold, I would be fine calling this down if hero didn't check raise.

The more I thought about this after the fact, the more I hated my x/r. So we can call more comfortably on the river, simply because we're keeping villain's range wider by flatting the flop?

When if ever should we feel the need to make a small x/r? For example, if villain bets some very small amount like <1/4 on a wet board?