The knights tour is a common but difficult chess puzzle. In the puzzle the knight starts in it's normal position and follows the rules of standard chess. The goal is to have the knight land on every square without landing on the same square twice. There are two types of the puzzle. If the knight lands on square that can attack the knight on the staring position it is called a closed tour. If doesn't it is a open tour.
Knight's Tour:Chess Puzzle- mobile game variation of chess problem