bellagio 10-20 deep: trips facing river crai

[mikech]

this was from a few mornings ago, couple of swedish guys in the game are providing the action. i think they're pretty good players, they're just splashing around a lot. anyway, the most active one opens utg to 100, i call with 9 [img]/images/graemlins/spade.gif[/img] 8 [img]/images/graemlins/spade.gif[/img], button and a blind call also.

flop is 8 [img]/images/graemlins/heart.gif[/img] 5 [img]/images/graemlins/spade.gif[/img] 3 [img]/images/graemlins/diamond.gif[/img]. utg pots it for 400. he's very capable of having AK or 77 here, and we have about 7500 behind, so i call.

turn is the 8 [img]/images/graemlins/diamond.gif[/img]. he checks to me, i think for a bit and bet 600, he calls quickly.

river is a J [img]/images/graemlins/heart.gif[/img]. he checks again, i bet 1k, he instantly announces all-in. it's about 5400 more to me. call or fold, and why?