TED-Ed: Can you solve the world’s most evil wizard riddle?

The video tutorial explains how to trap the evil wizard Moldevort on a 5x5 chessboard using Pythagoras' cursed chessboard. The challenge is to choose four distinct numbers that keep Moldevort trapped on the board. The strategy involves understanding the board's symmetry and using Pythagorean triples to limit Moldevort's movements. By selecting the numbers 1, 3, 4, and 5, you can keep Moldevort moving between specific spaces, preventing him from escaping until help arrives.

What is the main objective in the challenge against Moldevort?

• To find a hidden treasure on the board

• To escape from the chessboard

• To keep Moldevort trapped on the chessboard

• To defeat Moldevort using spells

Why does the initial strategy using numbers 1, 2, 3, and 4 fail?

• The board is too small

• The numbers are too large

• Moldevort can escape in three moves

• The numbers are not distinct

How does the Pythagorean theorem help in the strategy?

• It helps calculate the area of the board

• It provides a way to break the curse

• It identifies diagonal distances on the board

• It determines the number of moves Moldevort can make

What is the significance of the board's symmetry in the strategy?

• It allows Moldevort to move freely

• It simplifies the strategy by reducing the number of spaces to consider

• It makes the board more complex

• It helps in identifying the weakest points

Which set of numbers successfully keeps Moldevort contained?

• 1, 2, 3, 4

• 2, 3, 4, 5

• 1, 2, 4, 5

• 1, 3, 4, 5