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A Valentine Puzzle

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Tue Feb 14, 2017 12:41 am    Post subject: A Valentine Puzzle Reply with quote
Once again, Helmut surprises us with a set of Valentine Puzzles.

http://www.saueregger.at/sudoku/

Here is the one rated "Very Hard"


Code:

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


Keith
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Tue Feb 14, 2017 8:38 am    Post subject: Reply with quote
Hint:

http://www.dailysudoku.com/sudoku/forums/viewtopic.php?p=39940

Keith
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 1019
Location: Rimini, Italy
PostPosted: Tue Feb 14, 2017 11:25 am    Post subject: Reply with quote
Hi everyone,
I chose this way:

1-naked pair 3,9 in Box 8 Row 7 – r7c46;
2-XY-Chain r9c3 3,1 – r9c8 1,3 – r5c8 2,6 – r6c7 6,9 – r6c4 9,3 and r6c3-3;
3-naked pair 6,9 in Col 3 - r36c3;
4-XY-Wing r5c3 2,3 – r9c3 3,1 – r9c8 1,2 and r5c8-2=6.

Ciao
Gianni
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Feb 15, 2017 1:15 am    Post subject: Reply with quote
Code:

+------------+----------+----------+
| 3 8   5    | 7  4 2   | 1   9  6 |
| 4 1   7    | 6  9 8   | 5   3  2 |
| 2 69  69   | 1  3 5   | 8   4  7 |
+------------+----------+----------+
| 1 469 2469 | 5  7 69  | 269 8  3 |
| 5 369 2369 | 4  8 369 | 7   26 1 |
| 8 7   369  | 39 2 1   | 69  5  4 |
+------------+----------+----------+
| 6 2   8    | 39 1 39  | 4   7  5 |
| 9 34  134  | 2  5 7   | 36  16 8 |
| 7 5   13   | 8  6 4   | 23  12 9 |
+------------+----------+----------+

Play this puzzle online at the Daily Sudoku site

I had a couple of moves that created pincers, but I wasn't able to transport them profitably, so I had to go chain.

(2=1)r9c8-(1=3)r9c3-(3=4)r8c2-(4=692)r4c267=> -2r5c8,r9c7
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