Forcing chains - an impure solving technique?

Advanced methods and approaches for solving Sudoku puzzles

Postby Max Beran » Thu Feb 22, 2007 10:10 pm

I think wychwood's final remark captures the essence of my "hedonic principle" point

wychwood wrote:(and therefore also increase the enjoyment of these things).


i.e. Sudoku is supposed to be fun and "fun" trumps purity.

I feel short-changed if I download a "fiendish" level puzzle and discover that I can solve it with nothing more than naked triples or even quads.

X-wings and swordfish are slightly more fun (basically a positional eqivalent of a naked pair, triple etc). Forcing chains like xy-chains are even more fun even though they are searched for on the original grid. But true ecstacy is when the puzzle demands nice loops to solve it so then I can redraw the grid using my favoured
"mind-map" method posted Dec 2 2005.
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Postby sirdave » Fri Feb 23, 2007 1:59 am

I tend to think of forcing chains as the last, most 'primitive' of available methods, for use only when I can't find a nice loop, rather than on a level with an xy-chain which I will try to find before resorting to a nice loop.
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