Miscellany

                    for (int col = 0; col < _cells.GetLength(1); col++)
                    {
                        int value = int.Parse(cols[col]);
                        if (value < 10)
                        {
                            _cells[row, col] = new SudokuBoardCell(true, value, value);
                        }
                        else
                            _cells[row, col] = new SudokuBoardCell(true, 0, value/10);
                        }