If the cell where the lines meet one another contains the digit shared by the stem and the branch, you can safely eliminate it from being a candidate to it. To make it easier, trace a line over the column of the stem and another two over the rows of the branches. Join here Players with the same score are displayed in random order. The EBook contains 48 sudoku puzzles with solutions and will be sent by email. Each branch must share a candidate with the stem. Medium Hard Very Hard 81 cells to go Play and Win At the end of the month, 5 users with a score of 100 points or more will be randomly selected and win sudoku kingdom EBook. Their shape roughly resembles a Y shape, with a cell that works as the stem and two branches. The XY-Wing is applied when you find three cells, each with only a pair of candidates, that share at least a digit between them (e.g. Like with the X-Wing technique, you should then test both of them and eliminate that candidate from cells that become impossible when both sets are applied. When united, these blocks create a closed chain that reveals only two possible sets out their combination. The position of the cells does not need to be symmetrical, but each must be connected to at least another by column. With the Swordfish technique, you must have three rows that contain two cells each with the same candidate. The goal is to test these sets and eliminate that candidate from any cells in the grid that would become impossible under both. If one is true, then the other becomes impossible. By mentally connecting the two diagonal extremities of this, you can determine that only two pairs of possibilities can come out of this link. You can apply the X-Wing strategy when you find the same candidate in four different cells within the grid, united by row and column, and forming a square or rectangle when tracing an imaginary line between them. Some tips for solving Sudoku: Avoid trial and error find a logical reason for entering each number. ![]() These then branch out into other advanced techniques used mostly for the evil and impossible levels. Easy Medium Hard Evil Variations Ebook Go Deluxe To complete the Sudoku puzzle, enter numbers into the spaces so that each row, column and 3×3 box contains the digits 1 to 9 without repeats. The three most used in this level are called X-Wing, Swordfish, and XY-Wing. Hard Sudoku Solving TechniquesĪdvanced techniques used in hard Sudoku levels are designed to eliminate candidates and help clear the grid. Advanced techniques will also be required to eliminate candidates and find the solution for each cell. In this difficulty level, the number of allocated clues at the start of the game is considerably reduced and finding the solution for the remaining cells requires high doses of concentration and logic.Īt this point, pencil notes are no longer an option but rather a necessity to be able to work through the grid. Lees Sudoku Solver: How to Play and Solve Easy, Medium & Hard Sudoku Puzzles with Winning Rules, Tips, Tricks and Strategy. ![]() Hard Sudoku Puzzles are designed for experienced players.
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