![]() This helps you in identifying combinations and later erase numbers that do not fit the solution. Filling in these numbers will give you the boost and cue to find the missing numbers across corresponding rows, columns, and grids.Īnother systematic Sudoku solver strategy is pencil marking which means you pencil in possible numbers inside cells after scanning rows, columns, and grids. This helps you in spotting which numbers are missing easily and quickly. For example, rows with almost 5 out of 9 numbers or a 3x3 grid with 6 out of 9 numbers pre-filled are a good place to start. Look for rows and columns with a lot of numbers already filled. While this technique is not always necessary or appropriate, it can be very effective in certain situations and can help players find the correct solution to even the most challenging puzzles.Start by scanning rows and columns. It requires a deep understanding of the logical structure of the puzzle and the ability to create and analyze chains of possibilities. In conclusion, the forcing chain technique is a powerful tool for solving sudoku puzzles. It is also important to keep in mind that the forcing chain technique can be time-consuming and complex, so it may not be the best approach for every puzzle or every player. Many puzzles can be solved using simpler techniques such as naked singles or hidden singles. However, it is important to note that the forcing chain technique is not always necessary to solve a sudoku puzzle. ![]() This creates a contradiction in the puzzle, which means that the eliminated number cannot be the correct solution.īy following this process, players can gradually narrow down the possibilities and find the correct solution. This is because if the number in the first chain were correct, then the number in the second chain would be incorrect, and vice versa. If a cell in one chain has a number that is not a possible value for a cell in the other chain, then that number can be eliminated from the puzzle. Once the chains have been created, players can start to eliminate certain possibilities. These chains should be drawn on the puzzle grid and labeled with the possible values for each cell. ![]() Players must then create two chains of possibilities, each starting with one of the possible values for the pivot cell. ![]() To use the forcing chain technique, players must first identify a cell that has only two possible values. In this way, players can gradually narrow down the possibilities and find the correct solution. This technique involves creating a chain of possibilities, starting with a single cell, and using logic to eliminate certain numbers from other cells in the puzzle. The forcing chain technique is a complex technique that requires a deep understanding of the logical structure of the puzzle. While there are many techniques to solve sudoku puzzles, one of the most effective and powerful techniques is the forcing chain technique. To complete a sudoku puzzle, players must fill a 9x9 grid with numbers from 1 to 9 in such a way that each row, column, and 3x3 box contains all the numbers from 1 to 9 without repeating. Sudoku is a popular game that requires logical reasoning and problem-solving skills.
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