Anti-Consecutive Sudoku
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Lätt · Anti-Consecutive Sudoku
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Hur man spelar Anti-Consecutive Sudoku
Standard Sudoku-regler gäller. Extra regel: inga två ortogonalt angränsande celler (som delar en kant) får innehålla på varandra följande siffror. Om en cell innehåller 5 måste alla fyra grannar undvika 4 och 6.
Fullständig guide →
Ortogonalt angransande celler far inte innehalla konsekutiva siffror
Anti-Consecutive Sudoku Lätt
Anti-Consecutive Sudoku Medel
Anti-Consecutive Sudoku Svår
Anti-Consecutive Sudoku Expert
Vad är Anti-Consecutive Sudoku?
Anti-Consecutive Sudoku (en strängare form av Non-Consecutive Sudoku) inför regeln att inga två ortogonalt angränsande celler får innehålla på varandra följande heltal. Denna variant kräver ofta färre givna siffror eftersom begränsningen ensam eliminerar så många kandidatpar. Den kombineras ibland med Anti-King eller Anti-Knight för att skapa extremt begränsade pussel.
Översikt
| Begränsningstyp | Anti-begränsningar |
| Typiska givna | 18–24 |
| Svårighetsbetyg | ★★★☆☆ 3/5 |
| Genomsnittlig lösningstid — Lätt | 5 min |
| Genomsnittlig lösningstid — Medel | 13 min |
| Genomsnittlig lösningstid — Svår | 26 min |
| Genomsnittlig lösningstid — Expert | 48 min |
Hur man löser Anti-Consecutive Sudoku
| Teknik | Vad den gör | Nivå |
|---|---|---|
| Global Candidate Pruning | For every filled cell, remove its ±1 neighbours from all orthogonally adjacent cells immediately. | Avancerad |
| Digit 5 is Most Constrained | 5 cannot be adjacent to 4 or 6. Use this to restrict placement of 5 across the entire grid. | Avancerad |
| Chain Propagation | Placing a digit propagates constraints along rows and columns, often triggering a cascade of forced placements. | Avancerad |
| Forbidden Pair Maps | Build a map of forbidden digit pairs for each adjacent pair of cells and use it to eliminate candidates systematically. | Avancerad |
Genomsnittliga lösningstider
Lätt
5 min
Medel
13 min
Svår
26 min
Expert
48 min
Vanliga frågor
Vad är Anti-Consecutive Sudoku?
Anti-Consecutive Sudoku is a variant where no two orthogonally adjacent cells (horizontally or vertically neighbouring) may contain consecutive digits. The rule applies everywhere on the grid without any markers. Standard Sudoku rules also apply throughout.
How is Anti-Consecutive different from Non-Consecutive Sudoku?
Anti-Consecutive and Non-Consecutive Sudoku are the same constraint — the name is used interchangeably by different puzzle communities. Both mean: no two horizontally or vertically neighbouring cells may hold digits that differ by exactly 1.
Which digit placements trigger the most eliminations?
Digits in the middle of the range (4, 5, 6) eliminate two consecutive neighbours simultaneously. Placing a 5 removes both 4 and 6 from all four orthogonal neighbours, and placing those 4s and 6s in turn removes 3 and 7 from their neighbours — creating a cascade effect. Starting with central digits often unlocks large portions of the grid.
Is Anti-Consecutive Sudoku accessible for beginners?
What is the best approach to Anti-Consecutive Sudoku?
Treat the anti-consecutive constraint as an additional elimination layer. After every digit placement, immediately update all four orthogonal neighbours to remove ±1 from their candidate lists. The more given digits you have to start with, the more these cascade eliminations interact.
How long does Anti-Consecutive Sudoku take to solve?
Easy puzzles take 5–15 minutes. Medium puzzles run 15–30 minutes. Hard puzzles average 30–55 minutes and expert puzzles can take 60–90 minutes. Expert puzzles with very few given digits rely entirely on the anti-consecutive constraint for deductions.