11/18/2023 0 Comments X wing sudoku strategy![]() It is a single-digit solving technique that allows the player to eliminate candidates. The left branch cell YZ is cell (R2C3) and holds the candidates (2,9). An X-Wing is a fish pattern involving 2 rows and 2 columns. In this example, the stem cell XY is (R1C1), which contains the candidates (8,9). If you can find two columns with only two identical positions for a given pencil mark, then the corresponding rows intersecting these positions can have all other candidates safely removed. Sudoku XY-Wing (Example 2) At the left is a variation of the XY-Wing pattern that occurs in my experience more often than the first example described above. Of course, this whole concept can be rotated. As the X shows, if a 9 occurs in the upper left, it must also occur in the lower right, and vice versa. In Sudoklue, the same pencil mark highlighting feature that helps me find hidden singles and omissions, can make X Wings easier to spot as well. In the Sudoku puzzle below, the only squares in rows one and eight that can contain a 9 are highlighted. It tells us that the shared squares where the two alternative allocations for z intersect can not possibly contain a z. Knowing that, all other 4s in the columns are not possible, and can be erased (erase all the pink 4s).Īgain, this is one of those hard to find methods. The Sudoku Hook is a general technique, the term X-Y Wing name comes from its mathematical formulation as three squares containing x, y y, z and x, z. Based on what we said above, the 4s in these columns must exist where these two rows cross - that is, where the blue 4s are. Now if we think about this, we know that each of these rows has to have a 4, right? And we also know the 4s cannot be on top of each other, because that would put two 4s in the same column.īecause of this, we can safely assume that either the light blue cells or the dark blue cells must be 4s.Īrmed with this, let's zoom out all the way and shift our focus to the columns involved here (indicated with arrows below). Next, if we zoom out a bit, we can see that another row, two rows down, has the same two 4s, and in the same two spots: Here we see a row containing exactly two 4s: It will be easier to understand this technique if you look at the example. You shouldnt pay attention to the 3x3 blocks as they arent involved in this strategy. If you can find a row that contains the same pencil mark in exactly two spots, as well as another parallel row that mirrors it - containing the same pencil mark in only the same two spots, then you can use this information to eliminate similar pencil marks in the columns passing through those spots. '-wing' is an advanced sudoku technique, which is based on the two parallel rows or two parallel columns. It starts with either two parallel rows or two parallel columns. Still, he told Cllr Durkan that he would contact the developer over the matter.An X Wing is a technique for removing candidates (pencil marks). He also said that the flooding could be alleviated via a vacuum machine, but added that this costs €1,000 a day to operate. When KCC said that it’s Development Control Section 'would liaise with the developer to ensure the road gullies are connected into the water system at Hawthorn Manor and function appropriately’, Cllr Wyse replied: "This seems to suggest that the developer is to blame, but I disagree with that KCC should be more proactive."Ĭyril Buggie, an engineer with KCC, said that the developer, as part of planning permission being granted, gave an undertaking to check up on the pipes. The motion was seconded by his party colleague Cllr Tim Durkan.Ĭllr Wyse told KCC: "It’s annoying to see this issue continue." By identifying and eliminating the other cells in those rows or columns that. This technique is named after the shape that is formed by two rows or columns that each contain two cells with the same two candidates, creating a rectangle that resembles the letter 'X'. ![]() ![]() He motioned for Kildare County Council (KCC) to prepare a cross-department strategy to alleviate flooding on the L7073 road between the entrances of Hawthorn Manor and Woodlands Park estates in Coill Dubh. The X-wing technique is a powerful strategy used in advanced Sudoku solving. To use XY-Chain, look for two bi-value cells (well call them 'pincers') that cant see each other but that have at least one number in common (well call it the 'shared number. A county councillor expressed his frustration over a road located in North Kildare.įine Gael Cllr Brendan Wyse made his views known at the latest Clane-Maynooth Municipal District meeting, which was held on Friday, October 6. The XY-Chain strategy allows you to eliminate candidates in a manner similar to Y-Wing.
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