Hand...

[Lmn55d]

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An aggressive stealer could open any 2, continue on the flop, pick up a FD on the turn, and C/R bluff the river as a last chance to win the hand

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99.9% of the aggressive stealers I've played against would either bet or checkraise this turn with a flush draw.

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An aggressive player could play a PP like this. An aggressive player could play a 5 like this, or a hand with a J in it like this.

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If they have those hands they usually want to showdown with them for cheap. I see no reason why they would checkraise the river, they probably think there is a decent chance they are good and just want to showdown.