well, Doyle explains it himself in SS.
Quote:
The most important thing to remember is that poker is a game of people. You've got to know what makes your opponent tick, and more importantly, you've got to know what makes him tick at the very moment you're involved in a pot with him
Doyle's playing people, while we're playing cards.
As an added bonus, here's a great Phil Ivey quote
Quote:
Once you pass a certain level, particularly in NL play, the fundamental strategies mean less and less, and winning poker comes down to two simple questions: "Does he have the hand he's representing" and "Does he think I have a hand than can beat his hand, or the hand he's representing."
The point is, at the 300/600nl 4k/8k mixed level, everyone has all the strategies we study down so cold that if you played that way, you'd be eaten alive. Once you get past $100/$200NL, poker becomes ~ 90% Psychological 10% Strategy.