[Stuey]

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The correct answer is not listed. It is "preflop mistakes". This is a wide range of mistakes that includes things like coldcalling when you should 3 bet or fold, and probably the biggest in my mind, limping / openlimping / overlimping when you should raise (almost always too passive) or fold (sometimes too loose). I'm pretty sure Ed Miller has said preflop mistakes almost always cost the most.

-DeathDonkey

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I agree you are right. But I think a large majority of 2ers have the preflop stuff close enough. Here is quote from Ed's post that lead me to skip the preflop leaks.
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Put things into perspective. That's why my book hammers on the postflop stuff so much. Because THAT is where people's big leaks are! That's where people are making LARGE mistakes OFTEN.


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They go hand in hand though. Anyone with a very bad preflop game is sure to get in a ton of costly situations they cant handle. But it is the post flop leaks that cost the most money directly.