#X WING SUDOKU TECHNIQUE HOW TO#
#X WING SUDOKU TECHNIQUE FREE#

Requirements to apply the Sudoku Swordfish strategy

In these cases, the elimination of candidates is more restricted, but still possible. When one single constraint is missing, the Finned Swordfish or Sashimi Swordfish variants may apply. The grid needs to meet basic constraints in order to apply the Swordfish strategy. It can also allow the player to apply more basic and easier strategies to progress in the puzzle. The use of this strategy usually results in the unveiling of the solution of one or several cells. It is considered as basic due to the clarity of the fish pattern required for its application and its recurrence. Up your game and try this technique out in an easy Sudoku puzzle created on our site, sudokuconquest.The Sudoku Swordfish strategy is a basic advanced technique applied in the hardest levels of these puzzles to eliminate candidates. Most of the time, X-Wing works well with Sudoku players who like using trial-and-error logic to solve their puzzles but is just as effective for people who like reading patterns as their main playing strategy. There’s no set way on how you will fit X-Wing into your Sudoku style, but by learning it, you can define your own system and play as you see fit. X-Wing is a great trick to use to make the process of elimination faster (which is the most time-consuming and challenging part of the game) and fill in cells easier. It is crucial to remember that the main objective of Sudoku is to solve a completed grid with an answer that has no repeating numbers between 1 to 9.

#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.

X wing sudoku technique