Villain has opened every 
button for 3 orbits:
SB: $10.24 (102.4 bb)
Hero (BB): $17.73 (177.3 bb)
CO: $7.60 (76 bb)
BTN: $11.62 (116.2 bb)
Preflop: 
Hero is BB with K

 3
 CO folds
CO folds, 
BTN raises to $0.25, 
SB folds, 
Hero calls $0.15
His 
range is very wide, we'll just say the 
top 50% of hands as an estimate.
Flop: ($0.55) 4

 2

 7
 (2 players)
Hero
 (2 players)
Hero checks, 
BTN bets $0.30, 
Hero calls $0.30
He has cbet both of the 2 times I've seen him see a 
flop, the sample is too small to be particularly useful, but with the somewhat 
loose preflop 
stats, I'll give him a wide 
range of made hands, semibluffs and 
air, let's go with:
22+,A2s+,KTs+,K7s,QTs+,Q7s,JTs,J7s,T7s,97s,87s,76s  ,A2o+,KTo+,QTo+,JTo
Turn: ($1.15) 6
 (2 players)
Hero
 (2 players)
Hero checks, BTN checks
When he checks 
behind, I'll eliminate from his 
range hands he'd want 3 streets of value for like overpairs and sets, plus decent semibluffing hands like 
open ended straight draws. That leaves him with 
marginal top pair hands, smaller pairs and 
air like bare overcards.
33,A2s+,KTs+,K7s,QTs+,Q7s,JTs,J7s,T7s,97s,87s,76s,  A2o+,KTo+,QTo+,JTo
River: ($1.15) J
 (2 players)
 (2 players)
The 
river comes an 
overcard that doesn't 
improve any drawing hands. Of his 
range above, I think he'll 
fold bare overcards and anything else weaker than a 
pair of 7s, so his calling or raising 
range is: 
AJs,A7s,KJs,K7s,QJs,Q7s,JTs,J7s,T7s,97s,87s,AJo,A7  o,KJo,QJo,JTo
and his folding 
range is:
33,AQs+,ATs-A8s,A6s-A2s,KQs,KTs,QTs,AQo+,ATo-A8o,A6o-A2o,KQo,KTo,QTo
That's 214 
combos out of 322, or 66% or 2/3. That's a really big percentage - in a vacuum, I could bet twice the pot, risking 2 units to win 3, which would require him to 
fold 2/3 of the time. It's not necessary to bet anywhere near that much, and I can make a highly profitable much smaller 
bluff of half the pot:
Hero bets $0.60