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Solving methods > Before starting :

 A sudoku puzzle comprises 9 rows, 9 columns and 9 block. Each of them must contain all numbers from 1 to 9. The following concepts are there to help you understanding the methods to solve a sudoku.

• The cell is the base unit of sudoku wich must be assigned a number from 1 to 9.
Each cell is part of three groups at a time: one row, one column and one block.
• The groups
• The row has nine cells disposed horizontally
• The column has nine cells disposed vertically
• The block has nine cells disposed in 3x3 squares, the puzzle comprises nine of these blocks.
• The segment is a row of three cells within a block, arranged either horizontally or vertically.
Each block thus containing 6 segments, and each row/column containing 3.
A segment is therefore part of both a block and a row or a block and a column.
• The candidates are the possible numbers for a given cell. They are shown in small charactères.
When only one candidate remains for a cell, then this number can be assigned to that cell.
When there are two candidates for a cell, one speaks of a pair, triplet for three and quad for four candidates.

Each method is illustrated by a graphic.