Ill-advised c/r river bluff? (they usually are)

[rigoletto]

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I'd expect them to both play and raise a little more than what you would see if the pot was heads up

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In my experience it is exactly opposite; people don't defend against a bluff multiway because they don't expect one. In addition you are more likely to get up against a resteal HU.

In this case there is a good chance that we are actually ahead on the turn and this is what makes it a bet!