A lot of you will already know all of this, but as I see this mistake on a daily basis (I wish this was an exaggeration) I felt it would be helpful to post this link here:
http://senseis.xmp.net/?33PointInvasion
*recommended reading for 15k-30k's*
corner invasions
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corner invasions
Just thought I would bump this back to the top... Still seems like a lot of people haven't learned this lesson.