5 tips for playing Sudoku better
For many years it has been understood that keeping the body in shape is not enough. The mind also has an important part to play. Life is getting longer and it is necessary to act in time to avoid running into problems of senile dementia. Study, reading and physical activity are very important. Among all these things we can add an exciting and at the same time fun game. This is Sudoku and it is another practical method of how to keep your mind trained.
In this article we will see 5 tips to play Sudoku better, developing effective strategies without losing the pleasure of solving the famous puzzle.
Sudoku is perhaps one of the most famous and longest running games in the world. Do you know him? The idea is very simple. We have a 9 × 9 grid, further divided into 3 × 3 sub-grids. Some cells are already filled, others are empty. The aim of the puzzle is to fill all cells with digits from 1 to 9 so that the same number is never repeated in every row and in every column and in every 3 × 3 grid. Each Sudoku has one and only one solution and, mathematics in hand, we can generate about 5,472,730,538 different ones, so many that you would not be able to solve them all within 1000 years! Of course there are difficult and simpler Sudokus. That's why we want to help you reduce this eternity with 5 tips for playing Sudoku better.
First of all you have to look for the so-called "single cells", ie those cells that can contain a single solution. Those are the first cells to fill in, but how do we find them? The scanning method is the simplest, but also very effective. Basically the idea is to scan all the rows and columns that make up each 3 × 3 square, gradually noting the possible solutions in each cell. You will certainly find cells that have a single solution. We then update the individual cell values and then iterate the scanning procedure. After a certain number of iterations you will arrive at the solution! During this procedure it is advisable to use pencil on paper or a digital Sudoku so that you can easily erase and update your hypotheses.
The X-Wing is therefore a technique that allows you to exclude one or more candidate numbers from other boxes. Perhaps it is a bit complex to explain, but it is certainly not difficult to apply. When two rows (or two columns) contain only two possible positions for a given number and those two positions are in the same two columns (or two rows), you can delete that number from all other still possible positions of the two columns (or two lines).
The “swordfish” or “Sworsfish” pattern is really very useful to guide you in solving the web Sudoku puzzle. The online Sudoku Swordfish strategy is a single candidate technique that uses 3 rows and 3 columns. The grid must contain 3 rows or 3 columns where the figure is only candidate in 2 or 3 cells. Each cell must be connected to another by row / column, regardless of the shape created when they are connected. Since the figure has only 2 or 3 possible positions in those rows / columns and the cells are connected, it means that the solution for that number will be found forcibly within that chain. The player can then test the different possibilities. The digit can then be safely deleted from all cells which become impossible in all cases.
A jellyfish is where four columns have a candidate in only four different rows, or vice versa. It's like an X-Wing or Swordfish expanded into four units. The columns or rows that have these candidates are the primary units and must contain only the candidates in the other four rows or columns called secondary units. All other candidates in secondary units can be eliminated.
A “Unique Rectangle” (UR) consists of four cells that occupy exactly two rows, two columns and two boxes. All four cells have the same two remaining candidates. So we can choose to keep equal values "on the cross".
Try these techniques and let us know! That's it from the board games section, keep following us!