Poker Stars, $0.05/$0.10 No Limit Hold'em Cash, 6 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

SB: $23.49 (234.9 bb)
Hero (BB): $10 (100 bb)
UTG: $7.64 (76.4 bb)
MP: $8.49 (84.9 bb)
CO: $20.01 (200.1 bb)
BTN: $12.56 (125.6 bb)

Preflop: Hero is BB with 6c 8c
4 folds, SB raises to $0.30, Hero calls $0.20

Flop: ($0.60) 2c 9c Ts (2 players)
SB bets $0.30, Hero calls $0.30

Turn: ($1.20) Td (2 players)
SB checks, Hero bets $0.70, SB calls $0.70

River: ($2.60) 9d (2 players)
SB checks, Hero checks

Results: $2.60 pot ($0.12 rake)
Final Board: 2c 9c Ts Td 9d
SB showed Ac 3c and won $2.48 ($1.18 net)
Hero mucked 6c 8c and lost (-$1.30 net)

I dont really like this line, should cb OTR, but the question is. Against unknown player, what is the best step OTF and why?