If two cells in the same block, row, or column can have only the same pair of candidates, then we can dismiss them from all the other cells in the same block, row, or column. Most of the techniques used to solve Sudoku puzzles work by eliminating candidates. So, you have to apply several Sudoku tricks & techniques to tackle these challenges and solve the puzzle.īefore we move on to the sudoku techniques, you must know what a Candidate is in Sudoku? A candidate is a value or a number that is the possible solution for a cell in a Sudoku Puzzle. The Sudoku game offers engaging challenges to all levels of players, be it novice or seasoned puzzle players.
Logical thinking & good organizational skills.Quickly learning & recognizing patterns.
#X WING SUDOKU TECHNIQUE FREE#
With this technique, you have now effectively removed possible logic errors in those rows and columns, and puts you one step closer to completing your Sudoku puzzle! Why Candidate Elimination Matters in Free Sudoku Puzzles If the 5 in both r4c4 and r6c7 are considered correct, all the other candidates in the same row and column can now be removed. Now, back to our example with the cells r4c4, r6c4, r4c7 and r6c7. Once you choose the cells containing the right numbers for your Sudoku logic using X-Wing, you can then remove the other existing cells with the same digits in their candidates. Candidate Elimination After Using X-Wing Candidate Elimination If the 5 in r6c4-which is connected to r4c7-is considered correct, then the other end of the X is logically true as well. Since r4c4 is connected to r6c7, then the correct number 5 for the entirety of row 6 and column 7 is r6c7. If you choose number 5 in r4c4 and consider it to be correct, then the digit 5 in r4c7 is to be eliminated since one of the rules of Sudoku requires you to remove duplicates in the same row or column. In this case, cell r4c4 is connected to r6c7 while r6c4 is with r4c7. The X in the technique’s name is also due to the relationship between these cells. In this case, the number 5 repeats in cells r4c4, r6c4, r4c7 and r6c7. The X-Wing relies on logic between the four identified cells sharing the same candidate digits. These four numbers act as the corner of the rectangle, and can also be connected with an X between them. Once you identify these four candidates, you can see that they form a rectangle of cells-hence why it’s called the rectangle rule. Once that’s done, it’s time to choose common candidates and start eliminating them using the X-Wing.įor example, you have the number 5 recurring as a candidate in r4c4, r6c4, r4c7 and r6c7. To do the X-Wing, it’s ideal to fill or pencil-mark candidates into all cells first, as this will make the overall solving process easier and more efficient. However, it’s important to note that not every puzzle can effectively be solved with just one technique like the X-Wing, but partnered with other strategies, it becomes a very useful tool to remember. The X-Wing is great at removing duplicate numbers and finding patterns in the logic of your Sudoku puzzle. It’s named as it is due to the X-like pattern it creates in the grid of the game. The X-Wing is a technique used in solving medium Sudoku puzzles and still can be used for harder difficulties, which commonly have fewer givens and rely more on the player making use of candidates and notes (which is also a feature in Sudoku Conquest as you can enter multiple numbers into a cell).
#X WING SUDOKU TECHNIQUE HOW TO#
Continue reading to know what it is, how to use it and other Sudoku tips! What Is the X-Wing in Sudoku Puzzles? X-Wing in Sudoku Puzzles X-Wing, also known as the rectangle trick, is one of the most commonly used tactics by Sudoku players in completing a grid. Once you’ve learned the basics of the game through easy Sudoku games, such as the terminologies and the mechanics, you can now begin trying out several effective strategies and techniques in Sudoku. On the road to becoming a more proficient Sudoku player, learning several strategies and techniques to solve Sudoku puzzles more effectively is essential.
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