[He moves the board between the two of them, white on Izunia's side and black on his own.]

The goal of the game is putting the opponent's king into checkmate--imminent capture with no way to remove the threat. [He taps the king on his side. After that, he starts going over the rest of the rules because that's quicker and also because the player doesn't remember all the rules of chess anyway beyond how the pieces move.]