Zigzag Sudoku [WSC 2007]

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Is this suitable for a Sudoku competition?

Yes
1
8%
Maybe
2
15%
No
10
77%
 
Total votes: 13

detuned
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Zigzag Sudoku [WSC 2007]

Post by detuned » Fri 28 Dec, 2018 3:26 pm

Screen Shot 2018-12-28 at 15.22.59.png
Screen Shot 2018-12-28 at 15.22.59.png (137.65 KiB) Viewed 2527 times
Source: 2007 World Sudoku Championship, Prague

The main thing to note with this puzzle is that it has two solutions, and that you have to find both of them. It is normally understood that a puzzle in competition should have exactly one intended solution, although it is noted that very occasionally organisers will erroneously include puzzles with either 0 or >= 2 valid solutions.

berni
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Re: Zigzag Sudoku [WSC 2007]

Post by berni » Wed 02 Jan, 2019 10:09 am

It's hard for me, to vote here: I think it's perfectly fine to have a sudoku with two solutions when this is known beforehand and both solutions are to be found. For me this is a "unique" solution (The two solutions of the sudoku form one solution of the whole puzzle). As far as I remember Wei-Hwa once even suggested to have all puzzles of a WPC to have two solutions to avoid people doing guesswork.

On the other hand, I do not understand those special series which look to me like more or less random numbers.

So could you please clearify, which question I'm answering? Only the question of two solutions or also the special series?

detuned
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Re: Zigzag Sudoku [WSC 2007]

Post by detuned » Wed 02 Jan, 2019 12:16 pm

I would say the special series is just a case of really bad phrasing - I don’t think there is anything there to upset anyone who isn’t also upset by consecutive sudoku. I would say the thing to focus on is the two solutions.

On the other hand, it would be interesting if there was some opinions against consecutive sudoku and I’d be more than interested to hear those arguments!

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