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Helmut's Valentine's Day Puzzles

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sun Feb 14, 2016 12:25 am    Post subject: Helmut's Valentine's Day Puzzles Reply with quote

Very cool!

http://www.saueregger.at/sudoku/ (February 14)

Use the left/right arrow icons to progress through the various levels.

Keith
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Sun Feb 14, 2016 4:25 pm    Post subject: Reply with quote

Hey! Cool! It reminds me of the 'heart' chess problem that the great chess problemist Pal Benko composed a few years ago. I'm sure that my wife never found problem solving very romantic though. If she came across a turtle that had accidentally flipped over on its back, I don't think she could solve it. Laughing I think I'll go solve this one right now (hopefully).

Update:

Here's the VH heart shaped puzzle.
Code:

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

And here's the grid after basics. I liked the fact that it be could solved with a 'standard' VH move for this site!
Code:

 +------------+--------------+-------------+
 | 1  5   2   | 68   78 67   | 4   3   9   |
 | 3  6   4   | 1    5  9    | 27  27  8   |
 | 7  8   9   | 23   4  23   | 1   5   6   |
 +------------+--------------+-------------+
 | 5  2   13  | 89   6  13   | 89  4   7   |
 | 9  137 137 | 3458 18 1345 | 358 6   2   |
 | 8  4   6   | 2359 79 2357 | 359 1   35  |
 +------------+--------------+-------------+
 | 24 379 8   | 459  19 145  | 6   27  135 |
 | 6  13  135 | 7    2  8    | 35  9   4   |
 | 24 79  57  | 4569 3  1456 | 27  8   15  |
 +------------+--------------+-------------+

Solution:
Quote:
18-9 XY Wing with pivot at r5c5 so r79c4,r6c5<>9; stte.

And for anyone that's interested, here's the link to Pal Banko's heart shaped puzzle that I mentioned. What could be nicer on Valentine's Day than destroying your wife at a game of chess? Very Happy
http://www.uschess.org/content/view/12090/702
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