AK river?

[Womble]

Party Poker No-Limit Hold'em, $ BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

<font color="#C00000">MP ($87.40)</font>
Button ($69.30)
<font color="#C00000">Hero ($97.50)</font>
BB ($71.61)
UTG ($279.45)

Preflop: Hero is SB with K[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img]. Hero posts a blind of $0.50.
UTG calls $1, MP calls $1, Button calls $1, <font color="#CC3333">Hero (poster) raises to $5.5</font>, <font color="#666666">1 fold</font>, UTG folds, MP calls $5, Button folds.

Flop: ($15) 6[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $12</font>, MP calls $12.

Turn: ($39) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, MP checks.

River: ($39) 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $15</font>, <font color="#CC3333">MP raises to $30</font>, Hero calls $15.

Final Pot: $99

Guy is 51/13/1 (although F/T/R agg is 8/1/2 over 50 hands)

Hmmmmm, confused about my turn play here - got what I wanted but checked [img]/images/graemlins/confused.gif[/img] Does a check have more value by inducing river calls or bluffs?

River - standard value bet of around half pot, suppose I could have bumped it to about $20. Easy call of the MR? What hands would have a 3 that would play this way?