dangerious floor exam preparation 75/100

using System;
using System.Linq;


    class Program
    {
        static void Main()
        {
            string[,]board=new string[8,8];

            for (int i = 0; i < board.GetLength(0); i++)
            {
                string[] figures = Console.ReadLine().Split(new [] {','}, StringSplitOptions.RemoveEmptyEntries).ToArray();

                for (int j = 0; j < board.GetLength(1); j++)
                {
                    board[i, j] = figures[j];

                }

            }
            // matricata e zaredena

            string input = Console.ReadLine();



            while (input != "END")
            {

                char[] moves = input.ToCharArray();
                char figure = moves[0];
                int row = int.Parse(moves[1].ToString());
                int col = int.Parse(moves[2].ToString());
                int nrow =int.Parse(moves[4].ToString());
                int ncol =int.Parse(moves[5].ToString());

                if (board[row, col] != figure.ToString())
                {
                    Console.WriteLine("There is no such a piece!");
                }
                else if (!Isin(board,nrow,ncol))
                {
                    Console.WriteLine("Move go out of board!");
                }
                else
                {
                    Moves(board,row,col,nrow,ncol,figure);
                }

              input = Console.ReadLine();
            }


        }

        public static void Moves(string[,] board, int row, int col, int nrow, int ncol,char figure)
        {
            switch (figure)
            {
            case 'K':
                if (Math.Abs(row - nrow) != 1 && Math.Abs(col - ncol)!=1)
                {
                  Console.WriteLine("Invalid move!");
                    break;
                }
                board[nrow, ncol] = 'K'.ToString();
                board[row, col] = "x";
                break;
            case 'P':
                if (row - nrow !=1)
                {
                    Console.WriteLine("Invalid move!");
                    break;
                }
                board[nrow, ncol] = 'P'.ToString();
                board[row, col] = "x";
                break;
            case 'Q':
                board[nrow, ncol] = 'Q'.ToString();
                board[row, col] = "x";
                break;
             case 'R':
                 if (nrow!=row && ncol!=col)
                 {
                     Console.WriteLine("Invalid move!");
                     break;
                 }
                board[nrow, ncol] = 'R'.ToString();
                board[row, col] = "x";
                break;
            case 'B':
                if (nrow == row || ncol == col )
                {
                    Console.WriteLine("Invalid move!");
                    break;
                }
                board[nrow, ncol] = 'B'.ToString();
                board[row, col] = "x";
                break;


        }



    }

        public static bool Isin(string[,] board,int r, int c)
        {
        return r >= 0 && r < board.GetLength(0) && c >= 0 && c < board.GetLength(1);
    }

    }