Problem
COM-B1-M06-P010 Token Moves Diagonally
#10
★★☆☆☆ Level 2 of 5
On a chessboard, a token starts on a black square. In one move it moves to a diagonally adjacent square. Can it reach a white square?
A diagonal move preserves the square color.
In chessboard coloring, diagonally adjacent squares have the same color. Thus the token's color is preserved. It cannot move from black to white.
Coloring as movement invariant.