As promised, I implemented the Swordfish classic Sudoku solving technique in my Perfect Sudoku software and generated a few puzzles. I just posted one of them on the Daily Sudoku page.
However, I ran my generator and generated a couple of thousands Killer Sudokus and NONE of them required Swordfish, just as I speculated before. Surely, in some of them you could use Swordfish, but they could also be solved by other Killer and/or classic Sudoku techniques. I will keep trying to generate one that REQUIRE Swordfish and will post it if I get it.
By the way, I consider X-Wing to be a simplified version of Swordfish, so everything I just said applies to X-Wing too.
Let me know how you like this “fiendish” classic Sudoku puzzles…
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