//Teste Spalten
      for (int Spalte = 0; Spalte < nSizeBoard &amp;&amp; ValueFound == false; Spalte++)
      {
        if (GameBoard[ActZeile, Spalte].Value == Value)
        ValueFound = true;
      }
      //Teste SubGameBoard
      int ZeileSubBoardStart = (ActZeile/nSizeSubBoard)*nSizeSubBoard;
      for (int Zeile = ZeileSubBoardStart; Zeile < ZeileSubBoardStart + nSizeSubBoard; Zeile++)
      {
        int SpalteSubBoardStart = (ActSpalte / nSizeSubBoard) *
        nSizeSubBoard;
        for(int Spalte = SpalteSubBoardStart; Spalte < SpalteSubBoardStart+nSizeSubBoard; Spalte++)
          if (GameBoard[Zeile, Spalte].Value == Value)
            ValueFound = true;
      }
      if (ValueFound == false) PossibleValues.Add(Value);
    }
    if (PossibleValues.Count == 0) return false;

    GameBoard[ActZeile, ActSpalte].SetPossibleValues(PossibleValues);
  }
    if (FindNextCell(ref NextZeile, ref NextSpalte) == true &amp;&amp; GameBoard[ActZeile, ActSpalte].Value!=0 )
    {
      return true; // We are done
    }
    do
    {
      if (Compute(NextZeile, NextSpalte) == true) return true;
    } while (GameBoard[ActZeile, ActSpalte].StepNextPossibleEntry() == true);
    return false;
  }
}