is exploitable by some amount. I am saying that we would like to improve upon this in practice by doing real-time planning. But we want to guarantee that by doing real-time planning, we're at least not going to increase the exploitability of our strategy relative to what we had before. Now, in practice, it ends up being way lower exploitability, but we want to guarantee. We can't really guarantee that it's going to decrease in most situations, but we want at least guarantee that's not going to increase. So, that is what I mean by safe subgame solving.