Logic Masters Deutschland e.V.

51 Disjoint Knights

Rules:

1. Standard: Normal sudoku rules apply.

2. Standard anti-knight: Digits cannot be placed within a knight's move (in chess) apart from the same digit.

3. Standard disjoint groups: Cells in the same relative position in each box cannot contain the same value. For example, R1C1 and R4C4 must be different values.

4. Standard killer: Cells in cages must sum to the total of the cage.

5. Standard arrow: Cells along an arrow must sum to the total in the arrow's circle.

6. Standard little killer: Cells along the indicated diagonal must sum to the total indicated, and may include repeated digits if allowed by other rules.

7. Standard extra region: Shaded areas are extra regions and must contain all values from 1 to 9.

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