KK with A on flop

[sl4v3]

Is this standard? In the few hands I'd played with the button he seemed like a solid tight aggressive player.

Party Poker 5/10 Hold'em (6 max, 6 handed) converter

Preflop: Hero is SB with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Button raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">1 fold</font>, Button calls.

Flop: (7 SB) 3[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, Button calls.

Turn: (4.50 BB) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, Button calls.

River: (6.50 BB) 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, Button checks.

[TheMetetron]

Bet. The. River.

[dave44]

You should bet the river. If he has an ace, he's betting it 99% of the time anyway. If he has QQ or JJ or some other garbage he'll call your bet much more frequently than he'll bet.