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Hudoku

 
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TNova



Joined: 17 Jul 2012
Posts: 16
Location: Bromley, UK

PostPosted: Mon Jul 30, 2012 7:25 pm    Post subject: Hudoku Reply with quote

I introduced myself in a post a few days ago, and as I mentioned, I did do Sudoku every day a few years ago. I'm getting back up-to-speed now, and even the VH on this site is usually straightforward. So I'm looking for puzzles that are a bit harder, but without being way beyond my abilities.

So I'm very grateful to Arkietech and Keith in particular for posting extra puzzles.

I also don't like puzzles that can't be solved without huge chains that stretch all over the grid. Here's one that Hodoku generated that I enjoyed - more difficult than a VH from this site IMO, but perhaps not as difficult as some of Arkietech's recent offerings.

My thanks to Marty who knew how to convert a text string of numbers into one of these grids.


Code:
+-------+-------+-------+
| . . . | 1 . . | . . . |
| . . . | . . . | . 5 6 |
| . . 9 | . 6 7 | 3 . 8 |
+-------+-------+-------+
| . . . | . . 1 | 7 . 2 |
| 1 3 . | . 2 . | . 9 4 |
| 6 . 2 | 3 . . | . . . |
+-------+-------+-------+
| 4 . 6 | 2 3 . | 5 . . |
| 8 2 . | . . . | . . . |
| . . . | . . 6 | . . . |
+-------+-------+-------+


Tim
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SudoQ



Joined: 02 Aug 2011
Posts: 127

PostPosted: Wed Aug 01, 2012 10:34 am    Post subject: Reply with quote

If you accepts a multi-step solution, this might be a good start:
Code:
|-------------------|--------------------|------------------|
| 235   6     3458  | 1      4589    23  | 249  24(7)  (79) |
| 237   1478  13478 | 489    489     23  | 1249  5      6   |
| 25    145   9     | 45     6       7   | 3     124    8   |
|-------------------|--------------------|------------------|
| 59    4589  458   | 6      4589    1   | 7     3     2    |
| 1     3     578   | 578    2       58  | 6     9     4    |
| 6     479   2     | 3      479    (49) | 18    18    5    |
|-------------------|--------------------|------------------|
| 4     179   6     | 2      3      (89) | 5    (78)   17(9)|
| 8     2     1357  | 4579   14579  59-4 |(49)   6    137(9)|
| 3579  1579  1357  | 45789  145789  6   | 2489  2478 137(9)|
|-------------------|--------------------|------------------|

It's also possible to show that r7c8<>8,
but then a network "that stretch all over the grid" is needed.

What solution do you suggest?

/SudoQ
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