I find that there needs to be some requirement of inductive reasoning to keep me interested in a sudoku; most straight sudoku puzzles, and just about all newspaper sudokus, are solved through deduction alone, so I've moved on to obscure variants such as "Greater-Than-Killer Sudoku" and the like. Of course, once I get the trick of a variant knocked, it becomes as dull as the original.
To be fair, some of the harder "straight" sudoku puzzles have a point where they become more chess-like -- you have to think two or three or four moves ahead because there's no place that you can definitely put a given number.
When you're into puzzles like the atrocious ones here that require techniques with names like X-Wing or Swordfish, it's probably best to just pull back.
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