3/6 Weird Check-raise All in on River

[tweed_blazer]

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Looks rather heavily like 88 (i'd fold)

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huh?

You could argue 88 might check the turn, but after Hero checks along and grossly underplays his overpair (on ALL streets), what in the world would make you think 88 would get sneaky enough to checkraise that river? I think with how deceptively Hero played this hand, this is a must call on the river.