AK unimproved river play

[geormiet]

I raise AKo utg in a 6 handed online game. Folded to the sb who 3 bets, folded to me, I call.

SB is a very solid winning tag, on the aggressive side. Solid and for the most part straightforward.

Flop is T83 with 2 spades. He bets, I call. TUrn is offsuit Q. He checks, I check.

River is a low blank. He checks, I?