public static void UpdateSquareNeighbours(this Grid grid, int s)
{
Console.WriteLine("update square {0}", s);
Cell[] square = grid.GetSquareCells(s);
for (int i = 0; i < grid.GridSize; i++)
{
if (grid.GetCell(square[i].X, square[i].Y).Solved)
{
continue;
}
grid.GetCell(square[i].X, square[i].Y).Options = grid.UpdateCellOptions(square[i].X, square[i].Y, s);
grid.CheckCellForSingleOption(square[i].X, square[i].Y);
}
}
