Re: how do you calculate winning percentage preflop
 

[ QUOTE ]
Learn the basics:
Over pair vs under pair
Two over cards vs lower pocket pair
two unders vs an overpair

you'll do just fine. It's not really useful unless you can put an opponent in an exact hand which is borderline impossible most of the time.

[/ QUOTE ]

Colin Moshman, in his book, <u>Sin 'n Go Strategy</u> , would disagree that one should limit himself to "the basics" that you give in your post.

Using a chart like those I linked to in my post (his has both ratio odds and percentages), he discusses how to think about pot odds, then he says, on page 254:

"We now suppose all factors lead to an odds-based call/fold decision. Then you should know these odds cold ."

(emphasis mine)