You have solid inner game when at that very moment, you do not desire to be someone else. Out of everyone in this world, you would much rather be yourself. Inner game is a combination of self acceptance and having an alpha mindframe. I know alot of people talk about "inner game" like it's something you actually have to go into great detail to learn. You don't have to, and you shouldn't. spend that time learning about actual pick up or even better, go out and sarge. Stop focusing on inner game, and just try to go out and talk to people. You'll realize that soon after that, you'll think to yourself "Man, I wouldn't trade my life for anyone elses." In my opinion, that is when you know you have solid inner game.