Where are the naked singles in Sudoku?
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Where are the naked singles in Sudoku?
The easiest way to find naked singles in the grid is using pencilmarks. Cells with a single pencilmark are easy to spot. Without pencilmarks, you need to inspect the peers of the cell and see if there is only a single digit missing in the peers.
What is the trick to solve Sudoku fast?
Sudoku techniques
- Scanning in one direction:
- Scanning in two directions:
- Searching for Single Candidates:
- Eliminating numbers from rows, columns and boxes:
- Searching for missing numbers in rows and columns:
- Eliminating squares using Naked Pairs in a box:
- Eliminating squares using Naked Pairs in rows and columns:
How do you solve Sudoku in 1 minute?
Yet there are still 5 tips to solve sudoku puzzles reasonably fast:
- Scan quickly for single candidates – yes, it is still the easiest and most reliable way to eliminate the unknown from the board.
- Don’t get stuck for too long on one part of the grid, see rule number 1 and scan the whole board.
What does hidden single mean in Sudoku?
A Hidden Single is a single candidate remaining for a specific digit in a row, column or box. In Sudoku variants, additional constraints can also produce Hidden Singles. An alternative term is Pinned Digit.
What is a naked number in Sudoku?
In sudoku, a naked pair is a set of exactly two candidates that are in exactly two squares in a row, column, or block. For example: In this example, the 2 and 3 in red on the right side is a naked pair. One of the squares in the pair has to be 2, and one of the squares in the pair has to be 3.
What is a fish in Sudoku?
Introducing Boxes Nowadays, any single-digit pattern that compares 2 partially overlapping constraint sets of equal size is called a fish. In standard Sudoku, the sets can contain rows, columns, and boxes. In Sudoku Variations with additional constraints, any combination is possible.