using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp27
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            textBox1.Text = "3 6";
            textBox2.Text = "5 0";
        }
        private void button1_Click(object sender, EventArgs e)
        {
            int[] bishopPos = new int[2];
            int[] knightPos = new int[2];
            char[,] board = new char[8, 8];

            bishopPos = textBox1.Text.Split(' ').Select(Int32.Parse).ToArray();
            knightPos = textBox2.Text.Split(' ').Select(Int32.Parse).ToArray();

            int m = 0;

            while (true)
            {
                if (m == 0)
                {
                    k = 0;
                    if (move(board, bishopPos, knightPos, bishopPos[0], bishopPos[1]))
                    {
                        MessageBox.Show("hello");
                    }
                    m++;
                }
                else if (m == 1)
                {
                    k = 0;
                    if (move(board, bishopPos, knightPos, ++bishopPos[0], --bishopPos[1]))
                    {
                        MessageBox.Show("hello");
                    }
                    m++;
                }
            }
        }

        int k = 0;
        private bool move(char[,] board, int[] bishopPos, int[] knightPos, int x, int y)
        {
            if (k == 0)
            {
                if (provera(++x, --y))
                {
                    board[x, y] = 'L';

                    move(board, bishopPos, knightPos, x, y);
                }

                if (x == knightPos[0] && y == knightPos[1])
                {
                    return true;
                }
                else
                {
                    k++;
                    x = bishopPos[0];
                    y = bishopPos[1];
                }
            }

            if (k == 1)
            {
                if (provera(--x, --y))
                {
                    board[x, y] = 'L';

                    move(board, bishopPos, knightPos, x, y);
                }

                if (x == knightPos[0] && y == knightPos[1])
                {
                    return true;
                }
                else
                {
                    k++;
                    x = bishopPos[0];
                    y = bishopPos[1];
                }
            }

            if (k == 2)
            {
                if (provera(++x, ++y))
                {
                    board[x, y] = 'L';

                    move(board, bishopPos, knightPos, x, y);
                }

                if (x == knightPos[0] && y == knightPos[1])
                {
                    return true;
                }
                else
                {
                    k++;
                    x = bishopPos[0];
                    y = bishopPos[1];
                }
            }

            if (k == 3)
            {
                if (provera(--x, ++y))
                {
                    board[x, y] = 'L';

                    move(board, bishopPos, knightPos, x, y);
                }

                if (x == knightPos[0] && y == knightPos[1])
                {
                    return true;
                }
                else
                {
                    k = 4;
                    return false;
                }
            }

            return false;
        }
        private static bool provera(int x1, int y1)
        {
            if ((x1 >= 0 && x1 <= 7) && (y1 >= 0 && y1 <= 7))
            {
                return true;
            }

            return false;
        }
    }
}