Expert Sandwich Sudoku
Les indices à l'extérieur de la grille donnent la somme des chiffres pris en sandwich entre le 1 et le 9 dans chaque ligne et colonne.
Expert Sandwich Sudoku. Les puzzles les plus difficiles du site — intersection de plage de somme et raisonnement de parité à travers les lignes et les colonnes. Aucune supposition.
27
2
17
12
0
0
3
10
9
27
15
9
24
32
2
0
4
5
3
4
6
9
5
8
3
9
2
2
5
5
8
1
7
2
4
3
1
9
4
1
7
2
7
Qu'est-ce que Sandwich Sudoku ?
Difficulté
★★★★☆
4/5
Type de contrainte
Indices extérieurs
Indices typiques
4–10 clue values
Moy. Résolution (Expert)
85 min
Techniques de résolution pour le niveau Expert
| Technique | Description | Niveau |
|---|---|---|
| Clue 0 Means Adjacent 1 and 9 | A sandwich clue of 0 means 1 and 9 are side-by-side with nothing between them. Place this pair immediately. | Débutant |
| Clue 35 Means 1 and 9 at Ends | A clue of 35 = 2+3+4+5+6+7+8. All middle digits are sandwiched, placing 1 and 9 at the two ends of the row/column. | Débutant |
| Position Enumeration | For each clue, enumerate all valid positions of 1 and 9 such that the enclosed digits sum to the clue. Cross-reference with column clues. | Intermédiaire |
| Sandwich Intersection | Row and column clues intersect at one cell. Combining row positions of 1 and 9 with column positions pinpoints key placements. | Avancé |
| Digit Forcing from Both Sides | Use clues from both the row and column sides to triangulate the positions of 1 and 9 simultaneously. | Intermédiaire |
Techniques à maîtriser au niveau Expert
- Technique X-Wing — Expert sandwich grids leave several crust positions ambiguous deep into the solve — X-Wings on 1 and 9 are how those ambiguities are finally cut.
- Swordfish technique — When three rows each hold two possible 9 positions in the same three columns, the Swordfish settles all three sandwiches simultaneously — the classic expert sandwich finish.
Temps de résolution moyen par difficulté
Facile
12 min
Moyen
26 min
Difficile
52 min
Expert
85 min
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Comment jouer à Sandwich Sudoku →
Variantes connexes
Killer Sudoku
Both are sum-deduction puzzles at heart — killer's 45 rule and sandwich's crust sums exercise the same arithmetic.
Skyscraper Sudoku
Outside clues again, but read as building visibility instead of sums — the same edge-of-grid deduction style.
Sudoku Extérieur
The gentlest outside-clue cousin: border digits simply belong in the nearest three cells, no arithmetic required.
Foire aux questions — Expert Sudoku Sandwich
Plus de questions ? Voir la Guide du Sandwich Sudoku.