public SaperCell[] get9TypeNeighbours()
{
SaperCell[] notOpenedCells = new SaperCell[numberOf9TypeNeighbours];
int counter = 0;
for (int i = 0; i < 8; ++i)
{
if (neighbours[i] != null && neighbours[i].value == 9)
{
notOpenedCells[counter++] = neighbours[i];
}
}
return notOpenedCells;
}