Check out my books on Amazon (paid link): https://amzn.to/2SiQjlp There is a 6x6 chocolate bar. We will take turns chomping at the bar from the top right corner. However, the bottom left is made of poison. The loser of the game is the person that consumes the poison. If you go first, can you find a strategy that guarantees you will win? And can you explain why the first player must win for any size chocolate bar, square or rectangle?