Sådan spiller du Anti-Ridder Sudoku
Ingen to celler med et ridder-træk imellem må indeholde det samme ciffer
Reglerne
Standard Sudoku-regler gælder: udfyld hver række, kolonne og 3×3-boks med cifrene 1–9, hver forekommer præcis én gang.
Anti-Knight Sudoku udvider Sudoku med en skakregel: enhver to celler, der kan nå hinanden med et skak springers træk (2+1 felter i en L-form), må ikke dele det samme ciffer. Hver celle har op til 8 potentielle springertræk-naboer. Dette skaber et rigt begrænsningsnetværk, der er adskilt fra og strækker sig ud over de standard række-/kolonne-/boksregler.
For hvor dette puslespil kom fra, hvordan det sammenlignes med relaterede varianter og et strategiresumé, se vores Anti-Ridder Sudoku variantoversigt.
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Sådan løser du Anti-Ridder Sudoku
Almindelige spørgsmål
Hvad er Anti-Knight Sudoku? ▾
Anti-Knight Sudoku is a variant where no two cells that are a chess knight's move apart may contain the same digit. A knight moves in an L-shape: two cells in one direction and one cell perpendicular. This adds a non-adjacent constraint that reaches across boxes and rows in ways standard Sudoku cannot.
How far does the anti-knight constraint reach? ▾
A knight's move covers up to eight possible cells: two squares in any cardinal direction plus one square perpendicular. These eight cells can span across different rows, columns, and boxes — so the anti-knight constraint connects parts of the grid that standard Sudoku treats as independent.
Is Anti-Knight Sudoku harder than regular Sudoku? ▾
Yes. The knight-move relationships are less intuitive than row/column/box constraints and require deliberate mapping. Easy puzzles are accessible once you visualise the knight's reach. Hard and expert puzzles use the constraint to create deductions that would be impossible without it.
What is the hardest part of Anti-Knight Sudoku? ▾
Remembering that the constraint spans across boxes. It is easy to forget that placing a 5 in the top-left corner eliminates 5 from cells that are in a completely different box. Systematically checking all eight knight-reach cells after every placement is essential.
Can standard Sudoku techniques still be used? ▾
Yes — all standard techniques apply, with the knight-move relationships treated as additional elimination links. Naked pairs and hidden singles can be found by treating any two knight-move-related cells as a pair subject to uniqueness.
How long does Anti-Knight Sudoku take to solve? ▾
Easy puzzles take 8–18 minutes. Medium puzzles run 18–35 minutes. Hard puzzles average 35–65 minutes and expert puzzles often exceed 90 minutes. The key to faster solving is visualising the full knight-reach pattern automatically after each placement.