Anti-Koning Sudoku
8
2
5
1
7
4
7
4
3
5
9
1
4
5
9
7
8
2
1
6
9
6
5
4
2
7
2
9
3
5
3
6
6
3
9
5
4
1
Fouten
0/3
Score
-
Tijd
00:00
Voortgang0%
Gemakkelijk · Anti-Koning Sudoku
Wissel moeilijkheidsgraad hierboven ↑
Hoe Anti-King Sudoku te spelen
Standaard Sudoku-regels zijn van toepassing. Extra regel: geen twee diagonaal aangrenzende cellen (of orthogonaal aangrenzend) mogen hetzelfde cijfer delen. Een koning op een schaakbord kan alle 8 omliggende cellen bereiken — geen van die cellen mag een cijfer delen.
Volledige gids →
Geen twee cellen die een koningszet uit elkaar liggen mogen hetzelfde cijfer bevatten
Anti-Koning Sudoku Gemakkelijk
Anti-Koning Sudoku Gemiddeld
Anti-Koning Sudoku Moeilijk
Anti-Koning Sudoku Expert
Wat is Anti-Koning Sudoku?
Anti-King Sudoku voegt een schaak-geïnspireerde beperking toe: cellen die bereikbaar zouden zijn in een enkele koningszet (orthogonaal of diagonaal aangrenzend) mogen niet hetzelfde cijfer delen. Dit breidt de niet-herhaalregel uit tot buiten rijen, kolommen en blokken om diagonale buren op te nemen, wat de beperkingsruimte in het hele rooster aanzienlijk verscherpt.
In één oogopslag
| Beperkingstype | Anti-Beperkingen |
| Typische gegeven cijfers | 22–28 |
| Moeilijkheidsbeoordeling | ★★★☆☆ 3/5 |
| Gem. oplossingstijd — Gemakkelijk | 5 min |
| Gem. oplossingstijd — Gemiddeld | 13 min |
| Gem. oplossingstijd — Moeilijk | 26 min |
| Gem. oplossingstijd — Expert | 48 min |
Hoe Anti-Koning Sudoku op te lossen
| Techniek | Wat het doet | Niveau |
|---|---|---|
| Diagonal Exclusion | The king constraint extends the exclusion zone to all 8 neighbours including diagonals. Apply diagonal exclusions before standard row/col/box logic. | Beginner |
| Corner Restriction | Corner cells (e.g., r1c1) only have 3 king-move neighbours. Start with corners and edges to build initial placements. | Gevorderd |
| King-Chain Elimination | When a digit is placed, eliminate it simultaneously from all 8 surrounding cells. | Gevorderd |
| Parity via King's Move | In Anti-King, consecutive digits often become mutually king-move incompatible — trace valid placement paths using this property. | Gevorderd |
Gemiddelde Oplossingstijden
Gemakkelijk
5 min
Gemiddeld
13 min
Moeilijk
26 min
Expert
48 min
Veelgestelde Vragen
Wat is Anti-King Sudoku?
Anti-King Sudoku is a variant where no two diagonally adjacent cells may contain the same digit. Combined with standard Sudoku rules (which already forbid matching digits in the same row, column, and box), this means a digit cannot appear in any of the eight cells surrounding a given cell.
Why is it called Anti-King?
The name comes from chess: a king can move to any of the eight adjacent squares (horizontally, vertically, or diagonally). The Anti-King constraint says no digit may be repeated within a king's move of any placed digit — it's the opposite of the king's reach being unrestricted.
How many cells does the anti-king constraint affect?
Each interior cell has eight neighbours (up to eight for corner and edge cells). All eight must hold different digits from the placed cell, on top of the standard uniqueness rules. Cells in the top-left to bottom-right diagonal neighbourhood are constrained in ways that standard Sudoku doesn't cover.
Is Anti-King Sudoku harder than regular Sudoku?
Easy Anti-King puzzles resolve faster than classic Sudoku because the extra diagonal constraint eliminates more candidates. Hard and expert puzzles compensate with fewer givens, and the diagonal interactions create subtle deduction chains that can be difficult to spot.
What is the best first move in Anti-King Sudoku?
Focus on corner cells first — they have the fewest anti-king neighbours (only 3 for a true corner). Then look at cells near already-placed digits and check how many of the eight neighbours already have that digit. Dense clustering of given digits often creates immediate anti-king placements.
How long does Anti-King Sudoku take to solve?
Easy puzzles take 6–15 minutes. Medium puzzles run 15–30 minutes. Hard puzzles average 30–60 minutes and expert puzzles can take 60–90 minutes. The diagonal constraint makes early progress fast but creates subtle interactions in the middle and end game.