static void Main(string[] args)
{
var puzzle = new SudokuPuzzle();
puzzle[1, 2] = 8;
puzzle[1, 3] = 1;
puzzle[1, 4] = 7;
puzzle[1, 5] = 9;
puzzle[1, 7] = 3;
puzzle[1, 9] = 4;
puzzle[2, 5] = 4;
puzzle[2, 8] = 1;
puzzle[2, 9] = 6;
puzzle[3, 3] = 6;
puzzle[3, 4] = 1;
puzzle[3, 6] = 3;
puzzle[3, 8] = 5;
puzzle[4, 6] = 8;
puzzle[4, 7] = 6;
puzzle[4, 8] = 4;
puzzle[5, 3] = 8;
puzzle[5, 4] = 9;
puzzle[5, 6] = 4;
puzzle[5, 7] = 1;
puzzle[6, 2] = 4;
puzzle[6, 3] = 9;
puzzle[6, 4] = 2;
puzzle[7, 2] = 9;
puzzle[7, 4] = 6;
puzzle[7, 6] = 5;
puzzle[7, 7] = 2;
puzzle[8, 1] = 8;
puzzle[8, 2] = 7;
puzzle[8, 5] = 2;
puzzle[9, 1] = 2;
puzzle[9, 3] = 5;
puzzle[9, 5] = 1;
puzzle[9, 6] = 7;
puzzle[9, 7] = 4;
puzzle[9, 8] = 9;
//puzzle[1, 2] = 4;
//puzzle[1, 5] = 1;
//puzzle[1, 6] = 7;
//puzzle[1, 8] = 6;
//puzzle[2, 7] = 5;
//puzzle[3, 1] = 7;
//puzzle[3, 3] = 1;
//puzzle[3, 6] = 8;
//puzzle[3, 7] = 3;
//puzzle[4, 1] = 2;
//puzzle[4, 2] = 1;
//puzzle[4, 3] = 9;
//puzzle[5, 2] = 6;
//puzzle[5, 4] = 7;
//puzzle[5, 6] = 2;
//puzzle[5, 8] = 8;
//puzzle[6, 7] = 6;
//puzzle[6, 8] = 4;
//puzzle[6, 9] = 2;
//puzzle[7, 3] = 4;
//puzzle[7, 4] = 3;
//puzzle[7, 7] = 9;
//puzzle[7, 9] = 7;
//puzzle[8, 3] = 2;
//puzzle[9, 2] = 5;
//puzzle[9, 4] = 2;
//puzzle[9, 5] = 8;
//puzzle[9, 8] = 3;
Console.WriteLine(puzzle);
var stopWatch = Stopwatch.StartNew();
var result = puzzle.Solve();
stopWatch.Stop();
if (result)
Console.WriteLine(puzzle);
else
Console.WriteLine("Puzzle couldn't be solved");
Console.WriteLine("Elapsed Time: {0}", stopWatch.ElapsedMilliseconds/1000.0);
}