This technique can be particularly useful in more difficult puzzles, where other techniques may not work as well. By looking at the rows and columns that the pairs belong to, players can determine where those two numbers can be placed within the puzzle. The X-wing technique involves identifying pairs of squares that have the same two possible numbers. By scanning each row and column within the smaller square, players can determine which numbers are still available to be used in the empty squares. This technique can be particularly helpful in smaller squares that have multiple numbers already filled in. Scanning involves looking for where a particular number can go within a smaller square. For example, if a row has only one square left to be filled and the options are 3, 5, and 9, cross-hatching can be used to determine which number goes in the square by checking which numbers have already been used in the other squares in the same row. Some of the most commonly used techniques include cross-hatching, scanning, and the X-wing technique.Ĭross-hatching involves filling in squares by looking for where a particular number can go within a row or column. Solving Sudoku puzzles can be a challenge, but there are several techniques that can be used to make the process easier. Section 2: Techniques for Solving Sudoku Puzzles For example, if a square has the options of 2, 3, and 7, then those numbers can be written in lightly to help keep track of what's left as more squares are filled in. To help solve the puzzle, it's important to keep track of the possible options for each square. Similarly, if a smaller square already has the digits 1 through 4 filled in, then the only possible digits left for the remaining squares in that smaller square are 5 through 9. For example, if a row already has the digits 1 through 8 filled in, then the only possible digit left for the empty square in that row is 9. One of the most important aspects of solving Sudoku puzzles is using logic to eliminate possibilities and narrow down the options for each square. The difficulty of the puzzle is determined by the number of squares that are initially filled in, with harder puzzles having fewer numbers filled in. The puzzle starts with some of the squares already filled in with numbers, and the rest of the squares must be filled in by using logic and deduction. Make sure to follow and view other videos Video by Sudoku Guy, owned by Sudoku Guy and not affiliated with. The objective of the game is to fill in the grid so that every row, column, and smaller square contains each of the digits one through nine only once. The grid is further divided into nine smaller squares of three by three, each of which must be filled with the digits one through nine. Sudoku is a puzzle game that consists of a grid of nine squares by nine squares. ![]() I leave the rest of the solution to the readers.Ī second sudoku article can be found here.Section 1: Understanding the Basics of Sudoku The rest of the puzzle can be easily solved by basic techniques. After all the redundant candidates in the empty cells are removed by the technique of "naked pair" new single candidates begin to appear in the puzzle. This means the redundant option 3 can be removed from cells (1,7) and (2,7) forming a naked pair with the candidate numbers 4 and 8.Ī puzzle consisting of only single candidates and naked pairs should be classified under the easy category. As a result, the cells (9,7) and (8,8) form a new naked pair with the candidate numbers 5 and 6.įinally, the three cells (1,8), (2,8) and (3,9) in box 3 form a naked triplet with the candidate numbers 1, 3 and 9. Similarly, the redundant options 3 and 9 can be removed from cell (8,8). Hence the redundant options 2 and 3 can be removed from cell (9,7). The three cells (7,7), (7,9) and (9,9) in box 9 form another naked triplet with the candidate numbers 2, 3 and 9. This means that the three cells (6,2), (6,6) and (6,8) in row 6 form a naked triplet with the candidate numbers 5, 7 and 8. ![]() See the paragraph above Figure 4 if you cannot see why the 2 in (6,2) cannot be used. In row 6, the only position possible for a 2 is (6, 4).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |