It turns out that if you just approximate what the Nash Equilibrium strategy is and then assume that the opponent is playing that, and apply Subgame solving in this way, that actually works really well in this domain. But we have found situations where this does not work well, and I think in more general settings, it would not do well. So, we actually use this in a few situations in Libratus. But in general, I would not recommend doing this. Unless the domain is specially structured that it would work. So, Safe Subgame Solving,