Thanks for the replies.
In the hand I called, after spending a bit of time trying to put him on a range.
On the river he represents
x, full house or quads.
is unlikely as he would CR turn or bet turn, it makes no sense to play it like that, so we are left with full houses or better.
As he seemed to me a normal TAG with quite low preflop raise of about 10%, it makes A5, A4, A2 less likely (in my experience many TAGs limp these hands), similarly many TAgs wouldn't raise 22, 44 and 55 in this spot. Ok, may be 55.
So his play is consistent with him having 55 and AA.
Moreover I had a 'feeling' that he actually held an A. But even if his play is consistent only with AA and 55 it is still a call, as we put him on too narrow range. (Add the possibility that he wouldn't CB with 55 every time on flop, making 55 a bit less likely.)
With such thoughts in mind I called and he showed
.
What impressed me is that just at 100NL, people are trying to make such complicated bluffs. Games are clearly getting tougher.
P.S. @ Triple B, you need to check some psychological studies about estimating probailities, it doesn't relate to poker explicitly, but it could help nevertheless. It was found that we tend to make big mistakes in estimating the rare events. Your estimation of 0.000001%, tells that I should have picked such a bluff once in 10^8 hands, once in 100 million hands. No one in the history of humanity plyed that many hands, moreover no one would have found himself in such a spot 1000 times, let alone 100 million. So, you couldn't possibly have any evidence to give such an extreme estimation. You see?
Just for your info, once again, it doesn't neccesary relates to poker.