Esperto Sandwich Sudoku
Gli indizi fuori dalla griglia danno la somma delle cifre insaccate tra l'1 e il 9 in ogni riga e colonna.
Esperto Sudoku Sandwich. I puzzle più difficili del sito — intersezione di intervallo di somma e ragionamento di parità attraverso righe e colonne. Nessuna ipotesi.
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
Cos'è Sudoku Sandwich?
Difficoltà
★★★★☆
4/5
Tipo di Vincolo
Indizi esterni
Dati Tipici
4–10 clue values
Media. Risoluzione (Esperto)
85 min
Tecniche di risoluzione per il livello Esperto
| Tecnica | Descrizione | Livello |
|---|---|---|
| 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. | Principiante |
| 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. | Principiante |
| 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. | Intermedio |
| Sandwich Intersection | Row and column clues intersect at one cell. Combining row positions of 1 and 9 with column positions pinpoints key placements. | Avanzato |
| Digit Forcing from Both Sides | Use clues from both the row and column sides to triangulate the positions of 1 and 9 simultaneously. | Intermedio |
Tecniche da padroneggiare a Esperto
- Tecnica 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.
Tempo Medio di Risoluzione per Difficoltà
Facile
12 min
Medio
26 min
Difficile
52 min
Esperto
85 min
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Come Giocare a Sudoku Sandwich →
Varianti correlate
Killer Sudoku
Both are sum-deduction puzzles at heart — killer's 45 rule and sandwich's crust sums exercise the same arithmetic.
Sudoku Grattacielo
Outside clues again, but read as building visibility instead of sums — the same edge-of-grid deduction style.
Sudoku Outside
The gentlest outside-clue cousin: border digits simply belong in the nearest three cells, no arithmetic required.
Domande Frequenti — Esperto Sandwich Sudoku
Altre domande? Vedi la guida completa Guida al Sudoku Sandwich.