What´s most important in a NL-MTT? Preflop-system?

[splashpot]

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What i am aiming for, is to break down the "decision-process" into small pieces. And then try to estimate of how much importance every point is. And as you see i haven´t thought it true very deep yet, but with some brainstorming here we might end up with something valueful.

I want to see the whole decision-process as a blueprint or puzzle. And maybe numbers isn´t the way to this

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You're not going to like this answer, but the way to do this is the same way every seasoned pro does it. Play real poker. Just learn to process all these bits of info everytime, for every hand. That's the only way. It comes with experience.