[Mason Malmuth]

Hi Stox:

Your answer is incorrect. The correct answer has to do with exactly how often he might be out of line and will then bluff the river after your fourth street check. With some players, their chance of being out of line on the flop is quite high, and then their chance of bluffing the river is also quite high. With this type of opponent, it's clearly correct to check the turn.

By the way, many of these real aggressive types, if they held a real hand, will always go for a check raise on fourth street after you raise on the flop. That's part of the reason why your answer is not correct. Their three betting the flop actully means less strebgth, not more.

Best wishes,
Mason