[betgo]

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My thinking is, someone who will raise 4th is going to keep betting if he doesn't meet opposition but maybe shut down and fold if I play back too hard. OK so I think you're right, I should bet 5th but on 4th I guess I'd rather he thought he was doing OK and I might fall over and fold any second now.

If you bet 7th, can you fold to a check-raise?

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He is raising 4th because he thinks he is ahead and may get you to fold. Trapping on 4th and 5th is bad here. It is obvious what you are doing and your edge isn't big enough.