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A truly hard Hard puzzle......

 
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immpy



Joined: 06 May 2017
Posts: 571

PostPosted: Sat Jun 03, 2017 2:20 pm    Post subject: A truly hard Hard puzzle...... Reply with quote

A little story with this one.....

My co-worker friend does puzzles like these all the time.....usually a Hard rating by our standards. But this one stumped him. He asked me to give it a try to help him get going.....what a puzzle.

I worked at it for hours, wrangling every elimination, using any tool that would work.....this is a good one, and it has some VH techniques in the mix. Try it out and enjoy.......a true hardest of the Hard, I'd say.....

Code:

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

Play this puzzle online at the Daily Sudoku site

...he got if from a newspaper in NW Indiana, do not know the date, but from 2017........
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Sat Jun 03, 2017 5:16 pm    Post subject: Reply with quote

Code:

+-----------------+--------------+----------------+
| 13458 3458 1358 | 145  2 6     | 47   147   9   |
| 145   45   7    | 145  9 8     | 26   3     246 |
| 2     9    6    | 3    7 14    | 5    14    8   |
+-----------------+--------------+----------------+
| 7     345  359  | 2    1 59    | 3469 8     456 |
| 3456  2345 2359 | 679  8 579   | 2349 245   1   |
| 568   1    2589 | 69   4 3     | 29   25    7   |
+-----------------+--------------+----------------+
| 58    2578 4    | 79   6 279   | 1    2579  3   |
| 15    6    125  | 1479 3 12479 | 8    24579 245 |
| 9     237  123  | 8    5 1247  | 247  6     24  |
+-----------------+--------------+----------------+

Play this puzzle online at the Daily Sudoku site
If 8 in R1C3 is true=>contradiction=>No 8 in the second column=>-8 R1C3
5 fin x-wing (line 6, line 7)-5 R8C1
swordfish (column 3, column 6, column 9) -5 R8C8, -5 R4C2,-5R5C128. Stte
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Sat Jun 03, 2017 6:34 pm    Post subject: Reply with quote

Sorry
If 8 in R1C3 is true=>contradiction=>two 5 in the first column (R7C1,R8C1)=>-8 R1C3
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

PostPosted: Sat Jun 03, 2017 7:13 pm    Post subject: Reply with quote

4 singles; Claiming(6R4); L9C8=6; HP(26)r2c79: 3 singles
Pointing(5B2) -> NT(679)r457c4 -> HP(79)r8c68 -> HP(14)r39c6 -> L7C6=2 -> Claiming(2C8) -> L6C7=9; singles to the end
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sat Jun 03, 2017 8:20 pm    Post subject: Reply with quote

JC Van Hay wrote:
4 singles; Claiming(6R4); L9C8=6; HP(26)r2c79: 3 singles
Pointing(5B2) -> NT(679)r457c4 -> HP(79)r8c68 -> HP(14)r39c6 -> L7C6=2 -> Claiming(2C8) -> L6C7=9; singles to the end


Yeah, I ran it through Helmut's Helper and was surprised to see it solved with basics.
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