![]() Just like the x-wing method, the swordfish is used to eliminate a candidate from specific cells, but instead of using two rows or columns like the x-wing, the swordfish uses three rows or columns. Then, if you find an XY-Wing, you can eliminate the shared possible numbers from all other cells in the same row, column, or 3x3 box. To use this technique: look for three cells, A, B, and C, where A and B share two possible numbers, B and C share two possible numbers, and A and C share one possible number. For this method to work, parallel pairs of sides on the rectangle must have the candidate in exactly two spots. For example, it's used when you can spot a rectangle formed by a single candidate in your notations. This method is used to eliminate potential candidates for a specific cell. The two techniques shared below will be of interest to players who are ready to start tackling more difficult puzzles. So, while it may be tempting to guess which number goes where, you should use the process of elimination instead. However, there's a catch you can't repeat any number in a row, column, or square. The goal is to fill every row, column, and square on the grid with the numbers 1 through 9. Sudoku is a number puzzle game where you need to rely on your logic and process of elimination to succeed. Instead, use logic to eliminate possibilities and find the correct numbers. Therefore, for the best results in solving your puzzle, you should avoid guessing or using trial and error. The most important thing to remember is that Sudoku is a logic puzzle. For example, if you know that a number can only be in one row, column, or 3x3 box, you can eliminate that number as a possibility from all the other cells in that row, column, or 3x3 box.
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