1. In the solution are all 7 letters of OKTOBER
2. In the solution are all 6 letters of HERBST ("autumn/fall")
3. No letter touches an adjacent letter of the complete alphabet on an edge or corner
4. In one row or column is the word TOR (from left to right or from top to bottom)
5. In every row and in every column is one vowel
6. The field index number of the K is half of the index number of the B
7. Only one of the two following statements is true: The fields with the H and the T touch each other with a side. The S is directly above the E
Solution code: row after row from left to right