public SudokuSolver(SudokuGrid grid)
{
Cells = grid.Cells;
CreateMatrix(grid);
for (int x = 0; x < Cells; ++x)
{
for (int y = 0; y < Cells; ++y)
{
if (grid.FlagAt(x, y) != SudokuGrid.CellFlags.Free)
{
TrySelectCandidate(GetCandidate(x, y, grid.ValueAt(x, y)));
}
}
}
}