[BugsBunny]

By the time we got to the river:

KJ (probably suited), although if you include offsuit it only adds 1 combination. AJ, JJ.

KJ, especially suited (1 combination) was a possibility since I wasn't sure if he would 3 bet a hand like that that preflop or cold-call (I didn't think he'd fold).

AJ was also possible, although again I wasn't sure if he would 3 bet that preflop, cold-call, or fold (especially if offsuit).

Something like QJs or JTs were remote outside possibilities, but I didn't think them very likely at all.

I was aware of the JJ possibility, but also figured that there was only 1 possible hand that beat me and that there were a few hands he may have played this aggressively.

If people would have played this the same as I did then the question becomes if there's no cap in HU play then at what point do you stop on the river? I think I reached my limit and wouldn't have pushed any further even in that situation.

Or did I overplay the river? Folding was obviously (to me at least) out of the question. I don't think that the flop or turn were overplayed. On the flop he may well have been playing AK or AA this way. Maybe even somerthing like QQ, Once the turn action comes those hands become much less likely (although an overplayed AA or AK would still be possible I suppose, but I didn't read him as that type of player)

Bottom line - most likely hands I put him on were KJ and JJ with some other small possibilities as well. I figured, off the cuff (without running numbers, since in the heat of the moment there's no time to start running calcs) that I was probably 55-60% likely to be ahead, but no worse than 50-50.