1. |
Use the diagonals method.
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3. |
Expand along row 1.
| -1 | -19 | 8 | -12 | 12 | 6 | -9 | -17 | -14 |
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4. |
Expand along column 3.
| -1 | -19 | 17 | 12 | 15 | -17 | -7 | 13 | -9 |
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6. |
Use the diagonals method.
| -10 | -20 | 3 | 11 | -2 | -19 | 13 | -18 | 17 |
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8. |
Expand along column 1.
| 16 | 3 | -16 | -20 | 2 | -5 | 1 | -1 | -9 |
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9. |
Use the diagonals method.
| -14 | 19 | -20 | 10 | -1 | 20 | 4 | -9 | 6 |
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10. |
Expand along column 2.
| -15 | 18 | 2 | 17 | 3 | -2 | -13 | 9 | -16 |
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12. |
Use the diagonals method.
| -1 | -14 | 18 | -17 | 6 | -19 | 10 | 1 | -5 |
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13. |
Use the diagonals method.
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14. |
Expand along column 3.
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15. |
Use the diagonals method.
| 20 | -13 | -5 | 3 | 18 | 12 | -9 | 6 | 15 |
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18. |
Expand along row 3.
| -1 | -10 | -12 | -6 | -16 | 1 | 18 | 7 | -2 |
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20. |
Use the diagonals method.
| -10 | -5 | -11 | -17 | 16 | 2 | -15 | 12 | 11 |
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21. |
Expand along row 2.
| -18 | -9 | -12 | 4 | 11 | -1 | 5 | 13 | -8 |
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