HU 1.5/3 checkraise river, good or bad?

[olof86]

Played about 25 hands before this, villian entered with 280 and seems pretty ABC, no real reads though.

Prima Poker skin
No Limit Holdem Ring game
Blinds: $1.50/$3
2 players
Converter

Stack sizes:
SB: $300.53
Hero: $272.00

Pre-flop: (2 players) Hero is BB with :8s :ah
[color=#cc0000]SB raises to $9</font>, Hero calls.

Flop: :2h :10c :7d ($19.5, 2 players)
Hero checks, SB checks.

Turn: :9h ($19.5, 2 players)
[color=#cc0000]Hero bets $15</font>, SB calls.

River: :7h ($49.5, 2 players)
Hero checks, [color=#cc0000]SB bets $35</font>, [color=#cc0000]Hero raises to $131</font>.