SB is TAGish (nitty passive) 20/7/1.2 after 86 hands. Button just sat down.

Seat 1: seppforcher3 ($177.40 in chips)
Seat 2: Button ($210.15 in chips)
Seat 4: SB ($198.60 in chips)
Seat 8: Hero ($621.10 in chips)
ANTES/BLINDS
SB posts blind ($2), Hero posts blind ($4).

PRE-FLOP
seppforcher3 calls $4, Button calls $4, SB calls $2, Hero checks.

FLOP (16)
SB checks, Hero bets $14, seppforcher3 folds, Button calls $14, SB calls $14.

TURN (58)
SB checks, Hero bets $55, Button calls $55, SB calls $55.

RIVER (223)
SB checks, Hero?
They both have about 140 left.

Do we push river? Play anything different?
Folding preflop is not an option .

I guess checking is OK, but I look to get called by something like [Qc] or [Tc] and I think they check behind.