Very nice post ISF! Also thank to Sauce for the great thread

I would add that when you are playing against an opponent like ISF, the fact that his 3bet range is not only wide but doesn't follow the top % of hands linearly (some of the hands he is 3betting according to this post - K-xs - are barely in the top 30% of starting hands!) is a great example of why taking detailed noted on what hands specifically your opponents are showing down is important. A HUD is a useful tool for getting a general idea of your opponents style, and a lot of players use them. Taking detailed notes on opponents showdowns during sessions and after when reviewing hand histories is just another edge we can have over our "lazier" competition.

By my understanding, opponents taking useful and detailed notes is the sort of thing that ISF is referring to when he says opponents adjust effectively to his 3betting range.