$0.05/$0.1 No Limit Holdem
6 players
Converted at weaktight.com
Stacks:
UTG RoyalRegiment ($11.06)
UTG+1 CABBAR1 ($5.18)
CO kiuns ($14.66)
BTN Hero ($10.00)
SB Betonglas ($11.22)
BB MYSTERE07 ($11.75)
Pre-flop: ($0.15, 6 players) Hero is BTN 

3 folds, Hero raises to $0.40, 1 fold, MYSTERE07 calls $0.30
Flop: 

($0.85, 2 players)
MYSTERE07 checks, Hero bets $0.60, MYSTERE07 calls $0.60
Turn:
($2.05, 2 players)
MYSTERE07 checks, Hero bets $1.40...
Stats: 59/31/1.7/36.5 (vpip/pfr/af/wts) with 334 hands
He called down to the river with Q high once and K another time. I had some more notes of him being a donkey.
So on a dry board like this he could have 2 overcards (which I beat), 2x and 3x, which is just a small part on his range, and a pocket pair which isn't very likely I think. I'm certainly ahead of his range so I second barrel as a semi-bluff with 15 outs. But against an opponent like this, should I just check behind or semi-bluff? I'm in position and even if I don't hit any of my outs on the river I can still win.