board[x][y] == "bKnight":
    potential_moves += [(x+2, y+1), (x+2, y-1)
                       ,(x+1, y+2), (x+1, y-2)
                       ,(x-2, y-1), (x-2, y+1)
                       ,(x-1, y+2), (x-1, y-2)]