[Nate tha\\\' Great]

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But the nature of the game is such that once a player gets beyond a certain caliber he will very rarely make a massive error.

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I disagree in that I think pretty much every player has blind spots. Oftentimes these are obvious things like game selection or playing too many hands before the flop but they can also be more subtle like tending to continuation bet on the turn too often. However, these players also often have extraordinary gifts, such as choosing the right bluffing frequencies or being excellent at manipulating their table image. Limit hold 'em is a fairly forgiving game IMO and one in which a player's strengths will tend to outshine his weaknesses.