//decreasing count in row/coll/cell
private void deductFromCounts(int position)
{
//calculate in what row/coll/cell given position is
int[] positions = PositionCalc.ReturnPositions(position);
numberCount[positions[0]]--;
numberCount[positions[1] + 9]--;
numberCount[positions[2] + 18]--;
}
//increasing count in row/coll/cell
private void addToCounts(int position)
{
//calculate in what row/coll/cell given position is
int[] positions = PositionCalc.ReturnPositions(position);
numberCount[positions[0]]++;
numberCount[positions[1] + 9]++;
numberCount[positions[2] + 18]++;
}