Logic Masters Deutschland e.V.

Normal sudoku rules apply.

The digit 1 must not see an identical digit by chess knight's move (anti-knight).

Each of the digits 2 to 7 must form a chain of identical digits connected by a sequence of knight's moves on distinct cells where the digit represents the number of digits on the chain. (eg. The digit 7 must form a chain of 7 identical digits connected by knight's moves).
Each digit forms exactly one such chain and the remaining digits must not see an identical digit by knight's move. (eg. The digit 2 forms one chain of 2 digits leaving 7 anti-knight digits).

No knight restrictions are placed on 8 or 9.

Digits separated by a black dot have a ratio of 1:2. Not all dots are given.

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