81 Cells vs 19 Dots vs 7 Dots: Kropki Sudoku Galore with an Anti-Knight Twist

Today's Puzzle:

A puzzle from Tingo that's wishing everyone a happy new year. Another great puzzle for the first week of the year. I promise we'll leave Christmas and New Year's behind us now 😃

Link to Play Along:

81cells vs 19dots vs 7dots by Daniël Rokven http://tinyurl.com/SudokuSleuth81Cells

Rules:

Normal 9x9 sudoku rules apply: In every row, column and in every 3x3 box the digits from 1 to 9 have to appear at least once.

Anti-knight: Cells separated by a knight's move in chess cannot have the same digit.

Difference kropki: Cells with a white kropki between them are consecutive.

Ratio kropki: Cells with a black kropki between them are in a ratio of 1 to 2. Which means you have the following possibilities, 1-2, 2-4, 4-8 and 3-6.