[Garland]

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Based on the limited action I can not reasonably put him on a hand range. I know he feels strong, but does he have the flush, str8 or maybe two pair, I am sure he does not have top pair or top two.

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I think you can...

It should be pretty clear by the action that he doesn't have two pair. Evidence is mounting: If he had a T, he would have bet the flop. If he had two pair on the turn, he would have bet regardless if you were threatening to check-raise or not. The only semi-reasonable hand that rivers two pair is K8. In addition no thinking sane player with any two pair hand will give you this much action on the river.

It's pretty simple: He has a QJ for a straight, or he made a diamond flush too. I think even the straight has to respect 3 diamonds on board and will just call your river check-raise, so I'm going on the assumption he has a flush, but keep in mind you have a fairly strong flush, one that beats many of his possibilities.

Actually it's kind of moot. You're given 495:150 pot odds. You have to call here, but you cannot re-raise if that's what you're thinking. Be thankful this isn't no-limit where a push by him will force you to make a real decision.

Garland