static void Main(string[] args)
{
var board = new SudokuBoard();
board.GenerateSimple();
board.Print();
board.SwapRows(0, 2);
board.SwapColumns(0, 1);
board.SwapRows(3, 4);
board.SwapColumns(3, 5);
board.SwapRows(7, 8);
board.SwapRowBlocks(0, 1);
board.SwapColumns(7, 8);
board.SwapRowBlocks(1, 2);
board.SwapColumns(1, 2);
board.SwapRows(0, 2);
board.SwapColumns(0, 1);
board.SwapRows(3, 4);
board.SwapColumns(3, 5);
board.SwapRows(7, 8);
board.SwapRowBlocks(0, 1);
board.SwapRows(7, 8);
board.SwapRowBlocks(0, 1);
board.SwapColumns(7, 8);
board.SwapRowBlocks(1, 2);
board.SwapColumns(1, 2);
board.SwapRows(0, 2);
board.SwapColumns(0, 1);
board.SwapRows(3, 4);
board.SwapColumns(3, 5);
board.SwapRows(7, 8);
board.SwapRowBlocks(0, 1);
board.SwapColumns(7, 8);
board.SwapRowBlocks(1, 2);
board.SwapColumns(1, 2);
board.SwapRows(0, 2);
board.SwapColumns(0, 1);
board.SwapRows(3, 4);
board.SwapColumns(3, 5);
board.SwapRows(7, 8);
board.SwapRowBlocks(0, 1);
board.SwapColumns(7, 8);
board.SwapRowBlocks(1, 2);
board.SwapColumns(1, 2);
board.SwapColumns(0, 1);
board.SwapColumns(0, 2);
board.SwapRows(0, 1);
board.DeleteRandomCells(81 - 30);
board.Print();
board.Solve();
}