Expert Outside Sudoku
Les indices à l'extérieur de la grille donnent les trois premiers chiffres rencontrés dans cette ligne ou colonne — mais pas leur ordre.
Expert Sudoku Extérieur. Les puzzles les plus difficiles du site — chaque placement découle d'un raisonnement logique précis à travers les contraintes de bordure et de boîte. Aucune supposition.
2
3
9
3
4
1
9
7
4
9
2
6
5
3
9
9
3
6
7
9
6
3
2
5
8
8
7
7
3
1
2
8
1
5
4
2
3
1
9
7
8
6
8
7
6
4
3
6
9
5
8
6
7
4
3
7
2
3
5
Qu'est-ce que Sudoku Extérieur ?
Difficulté
★★★☆☆
3/5
Type de contrainte
Indices extérieurs
Indices typiques
28–36 given + 4×9 outside clues
Moy. Résolution (Expert)
65 min
Techniques de résolution pour le niveau Expert
| Technique | Description | Niveau |
|---|---|---|
| Clue-Zone Mapping | Each outside digit must appear in the nearest 3 cells of its row or column. Map all outside clues to their zones immediately. | Débutant |
| Cross-Side Reasoning | If left clue digit X must be in cols 1–3, and right clue digit X is in the same row, that row already places X — the other side confirms its column. | Intermédiaire |
| Box-Side Interaction | An outside clue for a row interacts with the box containing cols 1–3. If the row's box is heavily constrained, the outside digit's position may be forced. | Intermédiaire |
| Digit Elimination from Clues | When a clue digit is placed in the zone, eliminate it from the rest of the zone row/col using standard Sudoku logic. | Intermédiaire |
| Dual-Side Chains | Combine left and right clues for the same row: both digits restrict the same three columns from opposite ends, leaving the middle box fully determined. | Avancé |
Techniques à maîtriser au niveau Expert
- Technique X-Wing — Expert outside grids under-clue the borders, so window logic alone stalls — fish on digits that appear in many clues, since their global positions are the most constrained.
- Swordfish technique — Three rows whose windows trap the same digit in matching columns set up a Swordfish — the standard escape from an expert outside-clue deadlock.
Temps de résolution moyen par difficulté
Facile
8 min
Moyen
18 min
Difficile
36 min
Expert
65 min
Envie d'un guide complet des règles, stratégies et étapes de résolution ?
Comment jouer à Sudoku Extérieur →
Variantes connexes
Skyscraper Sudoku
The next step in border-clue logic — outside numbers become visibility counts that constrain entire row orderings.
Sandwich Sudoku
Border clues with arithmetic teeth: each one is the sum of the digits trapped between 1 and 9.
Killer Sudoku
Moves the clue layer inside the grid as summed cages — a natural graduation from window placement to sum deduction.
Foire aux questions — Expert Sudoku Outside
Plus de questions ? Voir la Guide du Sudoku Extérieur.