Big the difference is that valid bad moves (equivalents of "cancer") were included in the analysis, it's only invalid ones (like "your body is kinda outgrowing itself") that were excluded from the analysis
What makes a chess move invalid is the state of the board. I don’t think moves like “pick up the pawn and throw it across the room” were considered.
That's a valid move in Monopoly though. Although it's much prefered to pick up the table and throw it.