Hi guys.

Indeed the best tutorial I could find about this topic.

I still have a problem though, the website I'm trying ( http://s2.kingsera.org/ ) doesn't return anything like the "authentication token". So what am I supposed to do in this case?

Thanks in advance

Thanks tlhIn`toq

I figured out my mistake! in line 47 count should be changed to count1 and it'll work!

sry I forgot to put the code between code tags. This is the code above:

using System;
class EightQueen{
	static int count = 0;
	static void Main(){
		int[,] A = new int[8, 8];
		for (int i = 0; i < 8; i++)
			for (int j = 0; j < 8; j++)
				A[i, j] = 0;
		Queen(A, 0, 0);
		Console.WriteLine("Total Solutions {0}", count);
		Console.ReadKey();
	}
	static void Queen(int[,] A, int row, int col){
		for (int i = row; i < 8; i++)
			for (int j = 0; j < 8; j++)
				if (Check(A, i, j)){
					A[i, j] = 1;
					CountF(A);
					Queen(A, i + 1, j + 1);
					A[i, j] = 0;
				}
	}
	static bool Check(int[,] A, int x, int y){
		int i;
		for (i = 0; i < 8; i++)
			if (A[x,i] == 1 || A[i,y] == 1)
				return false;
		for (i = 0; i < 8; i++)
			for (int j = 0; j < 8; j++)
				if (Abs(i-x) == Abs(j-y))
					if(A[i,j] == 1)
						return false;
		return true;
	}
	static int Abs(int X){
		if (X >= 0)
			return X;
		else
			return -X;
	}
	static void CountF(int[,] A){
		int count1 = 0;
		for (int i = 0; i < 8; i++)
			for (int j = 0; j < 8; j++)
				if (A[i, j] == 1)
					count1++;
		if (count >= 8)
			  count++;
	}
}