ATo always ridin my arse

[Felipe]

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You wouldn't open raise MP with ATo against somewhat tight opponents? I think I'd do it against most microlimit players, anyways. You know you're going to outplay them.

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eg.
We raise preflop with ATo in MP. An LP calls our raise. The flop is:

4 6 A

LP calls all our bets to the river.

What does he have? How can we outplay them when we don't know if we're best or not?