**Knight**moves in chess, it can move to a square that is away two squares horizontally and one square vertically,or two squares vertically and one square horizontally.A

**closed tour**for a

**Knight**is a sequence of moves,which have the Knight start and end in the same square and visit each other square exactly once.On a $4 \times 3$ board,is there a possible

**closed tour**for a Knight?