Re: How to narrow down the Range of your opponents
If your opponent is an amateur and will play any two cards it won't be necessary to put him on a range because any hand that you make will usually be stronger then whatever BS he is playing.
Against normal opponents a combination of intuition and experience will help narrow their ranges based on what you've seen up to that point. A tight player opening from early position will usually have a premium. A loose player opening on the button could mean almost any two cards.
Obviously polarizing your opponents in this way isn't the best way to get reads on them but it will help you to understand how it works. The more you do it the better you will get at it and eventually you will notice that at showdown your opponents are flipping up hands that you expect to see.
-Jerry
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