[bdk3clash]

Everything is good about this hand until the initial river check. On the turn, I don't see what 3-betting accomplishes other than potentially dropping MP2 and MP3, which probably isn't something you want with a hand that's likely behind at this point but that has many outs to pull ahead.

On the river, I prefer just betting out for a few reasons. Checkraising the button makes it less likely you'll collect overcalls from MP2 and MP3.

Also, for a player that didn't raise preflop and raised the turn on a Q-high board, there's little chance that A helped him, and you definitely don't want to see this one checked behind.

So I'd greatly prefer a river bet. Having checked, you have a clear checkraise. He isn't likely to have AQ here. (Yeah, I saw the results, but I didn't think he had AQ before I saw them.) You've got the second-nut two pair.