All Sudokus / Movement-Constraint Sudoku / Anti-Knight / Anti-King Sudoku

9x9 Movement-Constraint Sudoku

Anti-Knight / Anti-King Sudoku

This variant brings chess logic to the classic rules: a digit can't repeat in any cell a knight's move away, and it also can't repeat in any diagonally or orthogonally adjacent cell (a king's move).

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Anti-Knight / Anti-King Sudoku rules

  1. 1
    Rule 1

    The classic row, column, and 3x3 box rules apply as usual.

  2. 2
    Rule 2

    A cell's digit can't repeat in any cell reachable by a knight's move.

  3. 3
    Rule 3

    A cell's digit also can't repeat in any diagonally or orthogonally adjacent cell (king's move).