Originally Posted by Loading....
I thought if one person deviates from their NE then they will lose if their opponent is playing NE. You're saying GTO can't do better than breakeven against a non GTO opponent? That doesn't seem right.
It is not guaranteed that if you play NE and your opponent deviates, then you will automatically profit. Think for example of rock paper scissors. The optimal strategy is to randomly choose R P or S. But against your NE strategy you will break even against EVERY other strategy, regardless of how he plays.