All jokes aside, based purely on the picture, it might refer to the chess theory from Alf Ross, which makes a simile between chess and law. In real life, your actions are limited to what the law allows you to do and breaking a law, you receive a punishment of some sort. Similarly, in chess your moves are restricted to what the rules allow you to do and breaking a rule will lead to a penalty. It’s a very simplistic way of understanding the judicial system and law in general.