With harder puzzles, the brute force method gets even less useful. As the Sudoku Professor says: “The bottom line is that there’s a lot of confusing data. And, when you use the brute force method on hard puzzles, you frequently end up with a lot of spaces where 6, 7, 8 or more spaces are possibilities. In other words, the technique doesn’t actually allow you to narrow down anything.”
After explaining why the brute force technique is so useless, the Sudoku Professor offers an alternative – column elimination.
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