killer sudoko

For fans of Killer Sudoku, Samurai Sudoku and other variants

killer sudoko

Postby podge » Mon May 01, 2006 10:36 am

killer n0. 188 in London Times 29 April. Any ideas?
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Postby lunababy_moonchild » Mon May 01, 2006 12:18 pm

Posting the original puzzle and then where you got up to would give a clearer idea of what you mean.

Luna
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Postby Ruud » Mon May 01, 2006 3:16 pm

Here is the puzzle:

Code: Select all
.-----.--.--------.--.-----.
|11   |9 |23      |9 |21   |
:--.--:  '--.--.  |  |     |
|23|11|     |7 |  |  |     |
|  |  |-----:  |--'--+-----:
|  |  |20   |  |12   |11   |
|  '--:     |--'--.--'-----:
|     |     |16   |18      |
:-----+-----+--.  |-----.  |
|11   |30   |10|  |24   |  |
|  .--:  .--:  |  |  .--'--:
|  |19|  |8 |  |  |  |22   |
|  |  |  |  |--'--:  |     |
|  |  |  |  |8    |  |     |
:--:  '--+--'--.  |--'--.--:
|10|     |17   |  |23   |3 |
|  |-----'--.--'--:     |  |
|  |16      |13   |     |  |
'--'--------'-----'-----'--'


and in PS format:

Code: Select all
3x3::k:2816:2816:2306:5891:5891:5891:2310:5383:5383:5897:2826:
2306:2306:1805:5891:2310:5383:5383:5897:2826:5140:5140:1805:
3095:3095:2841:2841:5897:5897:5140:5140:4127:4127:4641:4641:
4641:2852:2852:7718:7718:2600:4127:6186:6186:4641:2852:4910:
7718:2096:2600:4127:6186:5684:5684:2852:4910:7718:2096:2106:
2106:6186:5684:5684:2623:4910:4910:4418:4418:2106:5957:5957:
839:2623:4169:4169:4169:3404:3404:5957:5957:839:


When you get stuck (after 2 placements), a '45' test will reveal that R8C236 sum up to 8. One of these 3 cells will contain a digit 1, so it cannot go into R8C9. This will leave 2 in R8C9, which in turn rules out 125 as configuration for the 3 cells. A {134} triple is the result.

R8C1 can now only contain {67}, so R9C1 must be {34}. Naked triple in N7.

A '45' test on C12 will show that R9C2 = R8C3 + 5. R9C2={89}. R8C3={34} Naked pair {34} in N7. R8C2=1.

It may be a little easier from there.

Ruud.
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Postby udosuk » Mon May 01, 2006 3:35 pm

This is exactly the same puzzle posted on Friday 21 April, 2006, labelled "No. 181", which the website adminstrator screwed up the links and didn't provide the solutions for the puzzles on that particular day... See my post for details...
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