Complete the grid that digits 1 to 9 occur once in every row, column and irregular region. Digit should not show up again in cells corresponding to a knight's move in chess.
Example: Given digit 5 in r3c8, digit 5 can be excluded in cells r1c7 and r2c6 by reasons of the knight rule.
Solution code: row 3 and row 7
on 23. October 2020, 06:45 by mada_madita
https://f-puzzles.com/?id=y28bycv7
Link to solve the puzzle
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