![]() If we look at the 4th and 8th rows, we’ll find the number two occurs twice in each row (in the same columns). When a number exists for a row (or column) only within one square, you can remove that number from the remaining blocks in the square. Blocking (aka Intersection)īlocking is similar to the subsets technique but applicable to single numbers. This example of a hidden subset was fairly obvious but sometimes they’re much more hidden and will become more visible when you start practicing the advanced techniques that are coming up. This is a useful strategy because we can now remove 2 and 3 as potential numbers in the rest of that square. The next step is to check the remaining blocks in the square and row.Īnd what do we find? A subset hidden at the end of the row (2 and 3). ![]() ![]() In the example, I’ve circled two blocks containing a naked subset (1 and 6). Hidden subsets are harder to see because they’re hidden amongst additional numbers but they operate the same way as naked subsets. We call it hidden because it’s NOT right out there in the open, totally obvious, or easy to spot. Sounds a bit confusing, I know, but it’s actually simple. Subsets can be naked (clear to see) or hidden (there are other numbers in the block that don’t need to be there). For example, you might have a subset pair which would be the same two potential numbers in two different blocks. Subsets are cells with the exact same potential numbers. These numbers can then be eliminated from other blocks in the row/column/square. Subsets are pairs or groups of numbers that occur in multiple blocks. Check out these two strategies! Subsets (naked & hidden) Intermediate sudoku techniques are useful for some medium-level puzzles but will mostly be used for hard puzzles. I may have removed potential numbers when doing so would make the strategy clearer. ![]() You can click on the example images to make them larger.There are 2 intermediate sudoku techiques and 5 advanced sudoku techniques that are really useful to learn: When you first learn How to Play Sudoku, you learn some basic techniques to use such as by row, column, square, etc., But eventually, you’ll move on to harder puzzles that require more advanced techniques to solve. This means Bailey’s Puzzles might receive a commission on the sale of certain items. ![]()
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