Code

# Python 3 Program to Check

# if the given chessboard

# is valid or not

MAX = 64

# Check if the given chess

# board is valid or not.

def isValid(c, n) :

    X = [ 0, -1, 0, 1]

    Y = [ 1, 0, -1, 0]

    isValid = True

    # Traversing each cell

    # of the chess board.

    for i in range(n) :

        for j in range(n) :

            # for each adjacent cells

            for k in range(n) :

                newX = i + X[k]

                newY = j + Y[k]

                # checking if they have

                # different color

                if (newX < n and newY < n and

                    newX >= 0 and newY >= 0 and

                    c[newX][newY] == c[i][j]) :

                    isValid = false

    return isValid

if __name__ == "__main__" :

    n = 2

    c = [ [1, 0],

          [0, 1] ]

    if isValid(c, n) :

        print("Yes")

    else :

        print("No")