Expert Odd/Even Sudoku
Les cellules ombrées doivent contenir des chiffres impairs ; les cellules non ombrées contiennent des chiffres pairs. Les indices de parité réduisent les candidats de moitié et rendent chaque placement important. Gratuit en ligne.
Expert Sudoku Pair/Impair. Les puzzles à contrainte de parité les plus difficiles du site — comptage de parité, X-Wings, et des chaînes de déduction multi-étapes sont toutes nécessaires. Aucune supposition.
8
4
6
8
7
5
6
5
7
2
1
3
7
8
7
2
8
4
1
9
6
7
5
1
2
Qu'est-ce que Sudoku Pair / Impair ?
Difficulté
★★★☆☆
3/5
Type de contrainte
Relations entre cellules
Indices typiques
20–26
Moy. Résolution (Expert)
50 min
Techniques de résolution pour le niveau Expert
| Technique | Description | Niveau |
|---|---|---|
| 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. | Débutant |
| Parity Counting per Box | Count how many odd-marked and even-marked cells are in each box to verify the digit distribution is achievable. | Intermédiaire |
| 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. | Intermédiaire |
| Parity X-Wing | When parity restricts a digit to exactly two rows and two columns, form a parity-based X-Wing for cross-elimination. | Avancé |
Techniques à maîtriser au niveau Expert
- Technique X-Wing — Expert grids shade fewer cells, but every shaded cell still halves a fish's candidate set — anchor your X-Wing rows on the parity marks that survive.
- Swordfish technique — A Swordfish on an even digit only needs to cover even-legal cells, which shrinks the pattern space dramatically — expert odd/even endgames usually hinge on one.
Temps de résolution moyen par difficulté
Facile
6 min
Moyen
14 min
Difficile
28 min
Expert
50 min
Envie d'un guide complet des règles, stratégies et étapes de résolution ?
Comment jouer à Sudoku Pair / Impair →
Variantes connexes
Sudoku Greater Than
Builds on value reasoning — inequality chains bound cells from both ends much like parity halves them.
Sudoku Kropki
Moves from cell properties to cell relationships: dots encode consecutive and doubled neighbours.
Sudoku Consécutif
Neighbour-difference logic with a strong negative constraint — a natural next step from parity counting.
Foire aux questions — Expert Sudoku Pair/Impair
Plus de questions ? Voir la Guide du Sudoku Pair/Impair.