Quote Originally Posted by Ash256
Is this ISF Theorem?

You haven't been 3betting light, and you 3bet from MP w/ 99. Flop comes T62 and you CRAI.
Wow I'm really glad I made this post, because it allows me to see flaws in peoples thinking.

Explaining ISF theorem normally involves saying "my range in his view is likely this, his range is that, so I bet/c/r/shove."

This isn't really ISF theorem. You've gotten part of it somewhat right, you have a tight range so you play it aggressively. BUT note you need to have the idea that your opponent thinks this as well. Also, see how you didn't even consider your opponents range? Your opponents range is very important here. Some people don't call threebets light at all, so surely if your opponent was only calling threebets with AK, TT+, this play would be horrible. Now if he's calling lightly, it's not horrible, but a lot of this hand can be explained by equity, and this play likely isn't good unless there is super aggressive spewy history.