SB is 18/4.

I put SB on AK, TT+, so was worried he had a higher set or A of diamonds. At least on the turn. I checked behind on river without thinking too much. Comments welcomed.

PokerRoom No-Limit Hold'em, $0.50 BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP1 ($13.95)
Hero ($28.20)
MP3 ($26.40)
CO ($26.95)
Button ($15.50)
SB ($27.50)
BB ($26.40)
UTG ($14.60)
UTG+1 ($14.25)
UTG+2 ($57.35)

Preflop: Hero is MP2 with 6, 6.
UTG calls $0.25, 2 folds, MP1 raises to $1, Hero calls $1, 3 folds, SB raises to $1.75, 1 fold, UTG folds, MP1 calls $0.75, Hero calls $0.75.

Flop: ($5.75) Q, J, 6 (3 players)
SB bets $2, MP1 folds, Hero raises to $7, SB calls $5.

Turn: ($19.75) K (2 players)
SB checks, Hero bets $5, SB calls $5.

River: ($29.75) 4 (2 players)
SB checks, Hero checks.

Final Pot: $29.75