active table. a lot of betting and raising on flop and turn.
hero has been there for around 90mins.
got felted by v when we shoved 2/3psb with AsJs on 8s9c7cTs turn and he called with Kc2c and hit a club on river.
hero rebought short and doubled up with AA vs KK and now sits on 620.
v has been running good and loose and has 1000.

weak tight in utg limps
hero (mp1) TcTs raises to 30.
co calls
v(btn) calls
sb folds
bb calls
utg folds

flop (127)
5h 6h 5c
bb checks
hero bets 100
co folds
v calls (range him on 77-99, 78, A6, 67,65,86, two high hearts)
bb folds

turn (327)
5h 6h 5c 2d
hero bets 125 (just enough to charge draws and enough strength to fold if raised)
v flats (77-99 fold some of the time
the 6s should probably raise. 65 probably flats.
not sure what he does with draws, but since he didn't semibluff on the flop flatting seems ok. I'd think he puts us on an over pair or a big ace with hearts.

river (577)
5h 6h 5c 2d 4c
hero? (we have 365 left)
we are now losing to the 6s and beating the busted draws. maybe some 77-99 stayed around as well. we like to see a showdown so hero bets 100.
v min raises to 200 (now what. fold? we have ridiculous pot odds

Bet the flop smaller.

Wtf is with the stupidly small bet sizing on the river? Either make a real bet (~275 or so) if you think he'll call with his smaller overpairs, or c/c if you think he'll bluff missed draws. As played called because of ridiculous pot odds although this is rarely a bluff.

Why are hands like A6, 56, 86 in his range but not A5, 45, or 57?

Why would a 6 raise the turn?

Why are we now losing to 6's on the river? (I assume you mean A6, 67, 68 not 66)

correct I mean 6x
in vs spot I often raise turn because
because of the flush draw. obv 66/56 will not raise and let us bet on river. if the flush card hits he might lose sometimes also sometimes he won't get action (from over pairs who figure that another part of vs range is now beating them)

This is a good example of SPR.

By raising the amount we did pre flop, we create an SPR of about 5. This is a VERY tough SPR for a hand like 1010 that flops an overpair.

We need to ask ourselves whether a hand worse than 1010 will put $590 into a $127 pot. Committing could be +EV or -EV depending on a villain, but it'll never be hugely +EV or -EV (closer to neutral EV).

You probably didn't think about this much pre flop, but what has happened is without realizing it, we've ended up almost committed to the hand by the river. By calling his min raise, we have invested almost all our stack into the hand.

Anyway, onto the hand as played. Your range for him looks good except you exclude 5-X totally, which is a huge mistake. On the river you're getting like 8-1 so need to be good 11% of the time. I guess I make a crying call...expecting to be good no more than 15% of the time at best.

Pre and flop is fine. Your turn bet looks really weak, it looks like exactly what you have, a middle pair higher than the board. On the river the 100 bet is just bad imo, what's the point? You put in 1/3 of your stack in on the river and now are thinking of folding to a min raise? This is a prime example of how people butcher middle pairs on low boards.

Fold river, just about no one raises as a bluff on the river.

nothing seems good on turn. if we check we could face a big bet with a lot of vs range. the 1/3-1/2psb (as we made) turns our hand face up to a thinking player. a stronger bet commits us when our hand isn't really that strong.