Logic Masters Deutschland e.V.

Intersectionality

Rules:

1. Standard: Normal sudoku rules apply.

2. Diagonal: Digits may not repeat on either main diagonal.

3. Anti-knight: Cells separated by a knight's move must contain different digits.

4. Killer: Digits in a cage must sum to the clue in the top left corner (if given). Digits may not repeat within a cage.

Hint:
Question: Given Aad's theorem, what happens when a digit appears in two adjacent 4-cell cages?
Answer: No digit can appear more than twice in the larger side of the Aad set (due to the smaller side containing no repeats), so if a digit appears in two adjacent 4-cell cages, it cannot appear in the unnumbered cage between them. Thus they cannot share more than two digits.

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