Neparný/Parný Sudoku
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Neparný
Parný
Lehké · Neparné/Parné Sudoku
Přepni obtížnost výše ↑
Jak hrát Odd/Even Sudoku
Standardní sudoku pravidla platí. Purpurově-kružené buňky (neparné) musí obsahovat 1, 3, 5, 7, nebo 9. Žluté buňky (parné) musí obsahovat 2, 4, 6, nebo 8. Špatná paritní číslice čítá jako chyba.
Kompletní průvodce →
Zaseněné buňky musí obsahovat neparné cifry; kružky musí obsahovat parné cifry
Neparný / Parný Sudoku Lehký
Neparný / Parný Sudoku Střední
Neparný / Parný Sudoku Těžké
Neparný / Parný Sudoku Expert
Co je Neparný / Parný Sudoku?
Odd/Even Sudoku označuje některé políčka jako odd (často šedovány) nebo even (často kruženy). Odd políčka musí obsahovat jednu z 1, 3, 5, 7, 9 a even políčka musí obsahovat jednu z 2, 4, 6, 8. To poloví kandidátovou množinu pro označené políčka ihned, vytvářujíc silné omezení bez poskytování specifických číslic.
Na Prvý Pohled
| Typ omezení | Vztahy buněk |
| Typické zadane | 20–26 |
| Ocena obtížnosti | ★★★☆☆ 3/5 |
| Prům. čas řešení — Lehký | 6 min |
| Prům. čas řešení — Střední | 14 min |
| Prům. čas řešení — Těžké | 28 min |
| Prům. čas řešení — Expert | 50 min |
Jak řešit Neparný / Parný Sudoku
| Technika | Co to dělá | Úroveň |
|---|---|---|
| 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. | Pokročilý |
| Parity Counting per Box | Count how many odd-marked and even-marked cells are in each box to verify the digit distribution is achievable. | Pokročilý |
| 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. | Pokročilý |
| Parity X-Wing | When parity restricts a digit to exactly two rows and two columns, form a parity-based X-Wing for cross-elimination. | Pokročilý |
Průměrné Časy Řešení
Lehký
6 min
Střední
14 min
Těžké
28 min
Expert
50 min
Často zadávané otázky
Co je 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.