Logic Masters Deutschland e.V.

Rules Set:

Normal sudoku rules apply.

Numbers outside the grid refer to the sum of numbers between 1 and 9 in that row or column. Some sandwich constraints are not given, but for each row and column, the sum of cells sandwiched between the digits 1 and 9 is a prime number and needs to be deduced.

Additionally, the digits 1, 2, 3, 5, 7 and 9 follow the anti-knight constraint. For each of these digits, a cell containing that digit cannot have the same digit a knight's move away.

Enjoy

The solution of this puzzle was generated by a computer, but the starting digits were handpicked and tested to allow for a fun solve. This is my first puzzle, any feedback is highly appreciated.