Not too much on the villain, 23/5/4 over 30 hands. He seemed reasonably tight and due to him being in the bb he was well capable of holding a 6. Should I bet this river or check it down? If you bet, how much?

PokerStars No-Limit Hold'em Tourney, Big Blind is t50 (9 handed) Hand History converter Courtesy of PokerZion.com

saw flop|saw showdown

SB (t3180)
BB (t2830)
UTG (t2485)
UTG+1 (t4730)
MP1 (t1805)
Hero (t2390)
MP3 (t3625)
CO (t630)
Button (t1555)

Preflop: Hero is MP2 with , .
UTG calls t50, UTG+1 calls t50, 1 fold, Hero calls t50, 2 folds, Button calls t50, 1 fold, BB checks.

Flop: (t275) , , (5 players)
BB checks, UTG bets t50, UTG+1 calls t50, Hero raises to t225, Button folds, BB calls t225, UTG folds, UTG+1 folds.

Turn: (t825) (2 players)
BB checks, Hero checks.

River: (t825) (2 players)
BB checks, Hero checks.

Final Pot: t825

Results in white below:
BB has 4h Th (two pair, sixes and twos).
Hero has 9s 9c (two pair, nines and sixes).
Outcome: Hero wins t825.

EDIT: This was the $4.40 180-man, about 100 left at the time