[PJS]

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It is fairly easy for a fish to stop playing junk (if they want to),

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You'd be suprised. Many players can't get past the boredom of playing fewer hands. They want to be involved in the action, not watch it. Many don't know how to watch a hand unless they are involved in it. So, even though they may stop for a little while as far as playing crap, they will most likely revert back to it. Especially after a bad run coupled with seeing other bad players take down pots with crap.

I wouldn't underestimate the discipline it takes to tighten up preflop longterm.

b

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I am not underestimating how many players play junk. Certainly, the vast majority of bad players do play bad cards. What I am saying, is even if someone is taking the time to improve their play, they may still be a poor player. For example, a person who is clueless about what cards to play can instantly improve their play by looking at a pre flop chart. However, they may not take the time to understand the theory behind playing hands in different situations and why a hands value changes, therefore, fail to adjust when they need to. Furthermore, there is no "quick fix" for post flop play (such as looking at a chart) it requires a lot of learning and thinking which the majority of players are not willing to do. As a result, they may get a quick understanding on when to fold to a raise pre flop, but still go too far with a hand once they have entered a pot.

I do agree though that most players do get bored and start playing too many hands, but I think even the players who try to stick to the pre flop guidelins play quite poorly after the flop.