// You move by entering a position in the format row col
public static char[,] PlayerMoves(this char[,] board)
{
Tuple <int, int> xy = board.EnterAMove();
int x = xy.Item1;
int y = xy.Item2;
while (x < 0 || y < 0 || y >= board.GetLength(1) || x >= board.GetLength(0) ||
board[x, y] == YOU_PLAYER || board[x, y] == COMPUTER_PLAYER)
{
xy = board.EnterAMove();
x = xy.Item1;
y = xy.Item2;
}
board[x, y] = YOU_PLAYER;
return(board);
}