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immpy
Joined: 06 May 2017
Posts: 574
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 Posted: Sat Jun 03, 2017 2:20 pm Post subject: A truly hard Hard puzzle...... |
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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 . | . . . |
+-------+-------+-------+
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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
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| Posted: Sat Jun 03, 2017 5:16 pm Post subject: |
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| 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 |
+-----------------+--------------+----------------+
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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
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| Posted: Sat Jun 03, 2017 6:34 pm Post subject: |
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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
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| Posted: Sat Jun 03, 2017 7:13 pm Post subject: |
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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
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| Posted: Sat Jun 03, 2017 8:20 pm Post subject: |
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| 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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