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UTG also gets to act last preflop.

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Is it a "rule of poker", or more of a house rule?

Also, you say a straddler can act last. Well let's say I'm UTG and straddle. There are only callers (no raisers). Can I then raise, or do I not get the option since I already, in essence, raised when I straddled?

Does a straddler act last just pre-flop or always? (Edit: nevermind this question, you answered it already.)

How does the dealer know you are straddling and not simply raising?