Sudoku Dispari/Pari
9
5
4
2
6
3
1
4
4
1
8
5
6
8
7
5
2
4
1
2
4
5
7
6
4
3
9
3
9
9
6
2
3
1
3
7
6
2
Errori
0/3
Punteggio
-
Tempo
00:00
Progresso0%
Dispari
Pari
Facile · Odd/Even Sudoku
Cambia difficoltà sopra ↑
Come giocare a Odd/Even Sudoku
Si applicano le regole standard del Sudoku. Le celle con bordo viola (dispari) devono contenere 1, 3, 5, 7 o 9. Le celle gialle (pari) devono contenere 2, 4, 6 o 8. Una cifra di parità sbagliata conta come errore.
Guida completa →
Le celle ombreggiate devono contenere cifre dispari; i cerchi devono contenere cifre pari
Sudoku Dispari / Pari Facile
Sudoku Dispari / Pari Medio
Sudoku Dispari / Pari Difficile
Sudoku Dispari / Pari Esperto
Cos'è Sudoku Dispari / Pari?
Odd/Even Sudoku segna alcune celle come dispari (spesso ombreggiate di grigio) o pari (spesso cerchiate). Le celle dispari devono contenere una di 1, 3, 5, 7, 9 e le celle pari devono contenere una di 2, 4, 6, 8. Questo dimezza immediatamente l'insieme dei candidati per le celle contrassegnate, creando potenti restrizioni senza fornire cifre specifiche.
A Colpo d'Occhio
| Tipo di vincolo | Relazioni tra Celle |
| Dati tipici | 20–26 |
| Valutazione della difficoltà | ★★★☆☆ 3/5 |
| Tempo medio di risoluzione — Facile | 6 min |
| Tempo medio di risoluzione — Medio | 14 min |
| Tempo medio di risoluzione — Difficile | 28 min |
| Tempo medio di risoluzione — Esperto | 50 min |
Come Risolvere Sudoku Dispari / Pari
| Tecnica | Cosa fa | Livello |
|---|---|---|
| Immediate Candidate Halving | Marked cells instantly reduce to 5 odd candidates (1,3,5,7,9) or 4 even candidates (2,4,6,8). Apply this before any other technique. | Avanzato |
| Parity Counting per Box | Count how many odd-marked and even-marked cells are in each box to verify the digit distribution is achievable. | Avanzato |
| Parity-Chain Elimination | If a row must contain exactly four even digits, and three positions are already even-marked, the fourth must come from the remaining unmarked cells. | Avanzato |
| Parity X-Wing | When parity restricts a digit to exactly two rows and two columns, form a parity-based X-Wing for cross-elimination. | Avanzato |
Tempi Medi di Risoluzione
Facile
6 min
Medio
14 min
Difficile
28 min
Esperto
50 min
Domande Frequenti
Cos'è l'Odd/Even Sudoku?
Odd/Even Sudoku is a variant where some cells are shaded to indicate whether they must hold an odd or even digit. Purple-ringed cells must hold odd digits (1, 3, 5, 7, or 9). Yellow-shaded cells must hold even digits (2, 4, 6, or 8). Standard Sudoku rules apply to all cells.
What is parity in Sudoku?
Parity refers to whether a number is odd or even. In Odd/Even Sudoku, you can immediately halve the candidate list for any shaded cell. An odd cell can only hold 1, 3, 5, 7, or 9. An even cell can only hold 2, 4, 6, or 8. Combined with row, column, and box constraints, parity constraints make early placements much faster.
How do parity markings help solving?
Shaded cells eliminate half the digit range immediately. If a row already contains three odd digits and has an odd-marked cell remaining, that cell is heavily constrained. Counting odd vs even cells in each row, column, and box often reveals hidden singles that would be invisible without the parity markings.
Is Odd/Even Sudoku harder than regular Sudoku?
At easy and medium difficulty, it is comparable to or easier than classic Sudoku because parity markings provide immediate candidate reductions. Hard and expert Odd/Even puzzles use sparser markings and fewer given digits, making them comparable in difficulty to hard classic Sudoku.
What is the best first move in Odd/Even Sudoku?
Scan each row, column, and box and count how many odd and even slots remain versus how many odd and even digits are still unplaced. When only one cell in a row can hold an odd digit, that cell must contain an odd digit from the remaining candidates — this is a parity-based hidden single.
How long does Odd/Even Sudoku take to solve?
Easy puzzles take 5–15 minutes. Medium puzzles run 15–30 minutes. Hard puzzles average 30–60 minutes and expert puzzles can take 60–90 minutes. Parity-based hidden singles are the primary acceleration technique that distinguishes fast solvers.