You have to bet the flop. #1 a check looks way more suspicious, #2 there is only 1 player left to act so your chances for a check-raise have diminshed, #3 you have 3 opponents in the pot for a pre-flop raise, someone must have overs, a draw, a smaller pair, whatever. you need to bet the flop.

You gotta bet this on the turn too. If the player behind me called again the river IS THE PERFECT oppportunity to get cute and go for a check raise.

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