No Donkey Step Sudoku 2015 N1

It has been a long time since I posted a sudoku. With a vacancy available in the Daily league, I thought it best to start posting again.

Today's sudoku is a No Donkey Step Sudoku. I had created this as one of the sudokus for the Polish National Championship but it ended up on the editing table :)

Rules of classic sudoku apply. Additionally, a digit cannot repeat with 2 cells from itself in any direction, even diagonally.