Hand converted with online PokerStrategy.com hand converter:
$0.5/$1 Fixed-Limit Hold'em (6 handed)
Preflop: Hero is BB with 6:h, 6:d.
4 folds, SB raises, Hero 3-Bets, SB calls.
Flop: (6 SB) 4:c, K:s, K:d (2 players)
SB bets, Hero calls.
Turn: (4 BB) 5:h (2 players)
SB checks, Hero bets, SB raises, Hero ???
Call him down or fold against unknown?