Obviously playing off of my previous thread "Do you ever play with yourself?" I was wondering if anyone ever picks up in the middle of a master game(Or any other game) when the position is equal and play it out?  Maybe even when the position is not equal.

Not really, though I often play out master games from the beginning after (hopefully) reading some text that puts the game in some unusual or important context. It's good to understand a little of what motivates each side.

Sure when I don't quite understand why something else wont work.  For example this position, optically, is dead lost for white, it's amazing that in reality it's a draw.  So I played it out a few times trying different things.  (If it looks interesting I posted the full game in the endgame forum with Bronstein's annotations after this position to the end).