Puzzle A: Sudoku rules apply. Digits must not show up in cells which can be reached by one step orthogonally forward, followed by one diagonal step to the left.
In case you prefer a 'knights move to the right only', you can solve the following puzzle B: Sudoku rules apply. Digits must not show up in cells which can be reached by one step orthogonally forward, followed by one diagonal step to the right.
Puzzle B was generated from puzzle A by mirror-reversing and by permuting the clues, that the solution code of row 5 is identical to that of puzzle A. Both puzzles are of equal difficulty.
Solution code: row 5
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