As we know from the rules each block row or column shall contain all numbers from 1 to 9 making it 45 in total.

What is the one rule in sudoku. One of the best-kept secrets to solving Killer Sudoku is the so-called 45 rule. Sudoku is played on a grid of 9 x 9 spaces. If you are a beginner and you are not yet familiar with the concept of the game then it is really important that you get some information about Sudoku.

Each row column and square 9 spaces each needs to be filled out with the numbers 1-9 without repeating any numbers within the row column or square. Within the rows and columns are 9 squares made up of 3 x 3 spaces. Naked Pairs are when there are just two candidates being looked for Naked Triple when there are three and Naked Quads when there are four.

- Sudoku is played over a 9x9 grid divided to 3x3 sub grids called regions. The most basic strategy to solve a Sudoku puzzle is to first write down in each empty cell all possible entries that will not contradict the One Rule with respect to the given cells. There is only one simple rule in Sudoku.

If a cell ends up having only one possible entry it is a forced entry that you should fill in. - The object of Sudoku is to fill the other empty cells with numbers between 1 and 9 1 number only in each cell. 7---2 2---7 will not make any difference as long as one pair of cells are in one 9-block and the other pair in another 9-block That is they are in two 9-blocks.

Each 33 box can only contain each number from 1 to 9 once. 3 Pay attention to the numbers in. What is the one rule in Sudoku.

- Sudoku begins with some of the grid cells already filled with numbers. This technique is known as Naked Subset or Disjoint Subset in general and works by looking for candidates that can be removed from other cells. Lets see this in action.