I posted this thread in LLSNL in which hero raises in EP to 15 in 1/3 and villain 3bets from SB to 65. This previous thread may be relevant.

I said that my experience has been that this is usually AA/KK. Several posters in the thread seem to feel that other hands are more likely. What has your experience been with players who do this?

I've seen this a few times in the past year, not surprisingly from horrible players. I wish I had taken better notes, but my memory tells me it was a couple times AK and once something like ATs.

The play obviously makes no sense, so it's hard to think logically about it. But I think it'd be unlikely to be AA or KK, just based on my experience and the fact that players will generally want to think about the situation and see a flop even if they decide to slowplay. I feel like I've seen it at least once be AA, but I think it'll be uncommon and AK or weaker makes more sense to me.

If I was forced to find a motivation for it, I might say: it might be seen from players who feel they should be playing AK or AQ or TT or JJ aggressively pre-flop but at the same time don't want to put a lot of money in post-flop unless they flop well, and they're thinking that by checking dark they might make an opponent cautious and get a free card or two out of it if they miss flop, or else induce action if they flop well. But again it's obviously a silly thing to do so there's a limit on what we can deduce from it.

3bet preflop combined with check/call on all three streets no matter the board texture? I've seen that countless times done with AA by older players. Which is no surprise because there's still old school guys in the 1/2 or 1/3 games who only 3bet AA/KK.

I've been told that line is even more popular at places that offer AA-cracked promotions.

[granted, the approach of only 3betting AA/KK plus a couple bluffs like AJs or 98s to balance the range isn't too far off from what most starting hand charts recommend as the best play from the blinds versus EP]

Odd behavior = strong

In my experience in that situation, it's usually "2nd-tier" hands [JJ, TT, AQ, AJ] that generally don't want action or want to take the pot down right there. From reading your post, the villain's play seems weird to me.

Agree with madlex... I've seen people play AA similar here... check-call the entire way. Usually falls into the super-nit / old person bucket.

Didn't see a reveal from showdown... did he have AA?

Where I play this could be anything. It's almost a straddle mentality and they strangely feel like they acquire position 'by default' on the Flop with the dark check since they can continue their unorthodox play in reaction to any bet (or check) made by the IP player(s) without giving away anything about their hand.

If the move is made by OMC, then yes, I would agree that it's probably a pretty strong hand but they want a free Turn or small pot for some reason. GL

Move was made by a guy in the 25-35 age range.

Anyways, villain had AA.

maybe his huds, on you, shows a high % prop bet IP and average % of folding cbets OOP