Originally Posted by trent32la
You should be raising the same amount every single time your opening a pot or else it can be easily read...another reason why you shouldn't open limp because when you finally raise 3x or 4x it basically gives away your hand strength...In cash game people will usually raise 3x or 3.5x....in tourneys usually just 2x....For me early on in tourneys ill raise 2.5x...after that a standard 2x
You can vary your opening bet size in various ways as long as it doesn't reflect different hand strengths. You gave one example yourself, based on stage of tournament.
Another possibility, one that Phil Gordon brings up in one of his books, is position - opening for different sizes from EP, MP and LP.
There are also other ways that wouldn't give away anything; e.g. flipping a coin like I just mentioned, using different sizes during the first and second half of each level, etc.