Remember to use pencil marks to keep track of candidate numbers, and don’t hesitate to revise your markings as you make progress. These advanced Sudoku strategies require practice and patience to master. If these conditions are met, you can eliminate one of the candidate numbers from other cells in the same row or column. Look for situations where four cells form a rectangle and have the same two candidates.If the presence of these candidates in the chain forces a particular elimination, you can use this information to solve the puzzle. This strategy involves three cells with specific candidates in a chain.
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If the candidate forms a “skyscraper” shape in the grid, you can eliminate the candidate from the corresponding rows. Similar to the X-Wing, the Skyscraper strategy identifies two columns with two candidate cells in each column.By examining these chains or loops, you can make eliminations or conclusions about other cells in the grid. Chains and loops are advanced techniques that involve creating a chain of linked cells with common candidates.If two cells in the same group (block, row, or column) share a candidate and they belong to different color groups, you can make deductions based on the candidates’ relationships. Coloring involves using two colors (e.g., red and blue) to mark candidate cells.If removing that candidate from one cell would force another cell to have a certain number, you can make eliminations based on these relationships. This strategy involves three cells with a specific candidate number in a chain of relationships.If you can find a pattern resembling a “fish,” you can eliminate the candidate numbers from the intersecting rows and columns. It applies when you have three rows and three columns, each containing two or three cells with the same candidate numbers. Swordfish is an extension of the X-Wing strategy.If the candidates form a rectangle in the grid, you can eliminate those candidates from the rest of the rows and columns. This strategy applies when you have two rows and two columns, each containing only two cells with the same candidate numbers.Even if there are other candidates in those cells, if you can determine that those numbers must appear in those cells, you can eliminate them as candidates from the rest of the block, row, or column. Search for groups of two or three cells within a block, row, or column where only two or three numbers are candidates.If you find such a group, eliminate those numbers from the rest of the cells in the block, row, or column.
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