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immpy
Joined: 06 May 2017
Posts: 574
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 Posted: Tue Jan 19, 2021 6:48 pm Post subject: VH (+?) 011921 |
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Hello all, enjoy the puzzle...
| Code: |
+-------+-------+-------+
| . . 6 | 3 . . | . 5 . |
| 5 7 . | . 1 9 | . 6 . |
| . . . | 7 . 6 | . . 3 |
+-------+-------+-------+
| . 5 8 | . . . | 3 . 6 |
| . 4 . | . . . | . 8 . |
| 6 . 2 | 5 . . | 9 4 . |
+-------+-------+-------+
| 8 . . | 1 . 2 | . . . |
| . 6 . | 8 3 . | . 2 9 |
| . 2 . | . . 7 | 5 . . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
cheers...immp |
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TomC
Joined: 30 Oct 2020
Posts: 359
Location: Wales
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| Posted: Wed Jan 20, 2021 3:17 pm Post subject: |
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After basics:
| Code: |
+-------------+--------------+-------------+
| 149 19 6 | 3 248 48 | 147 5 1247 |
| 5 7 3 | 24 1 9 | 8 6 24 |
| 2 8 14 | 7 5 6 | 14 9 3 |
+-------------+--------------+-------------+
| 179 5 8 | 249 2479 14 | 3 17 6 |
| 1379 4 179 | 69 679 13 | 2 8 5 |
| 6 13 2 | 5 78 138 | 9 4 17 |
+-------------+--------------+-------------+
| 8 39 5 | 1 49 2 | 6 37 47 |
| 147 6 147 | 8 3 5 | 14 2 9 |
| 1349 2 149 | 469 469 7 | 5 13 8 |
+-------------+--------------+-------------+
|
Play this puzzle online at the Daily Sudoku site
Eliminate 4 from r9c1 as r7c2 =3, r7c8 = 7, r7c9 = 4 then no 4's in box 8
Then r3c3 <> 4 as r3c7 = 1, r8c7 = 4 leaving no 4's in box 7
Tom |
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dongrave
Joined: 06 Mar 2014
Posts: 572
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| Posted: Wed Jan 20, 2021 6:11 pm Post subject: |
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| Code: | +-------------+--------------+-----------+
| 149 19 6 | 3 248 48 | 7 5 124 |
| 5 7 3 | 24 1 9 | 8 6 24 |
| 2 8 14 | 7 5 6 | 14 9 3 |
+-------------+--------------+-----------+
| 179 5 8 | 249 2479 14 | 3 17 6 |
| 1379 4 179 | 69 679 13 | 2 8 5 |
| 6 13 2 | 5 78 138 | 9 4 17 |
+-------------+--------------+-----------+
| 8 39 5 | 1 49 2 | 6 37 47 |
| 147 6 147 | 8 3 5 | 14 2 9 |
| 1349 2 149 | 469 469 7 | 5 13 8 |
+-------------+--------------+-----------+
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(7=3)r7c8 - (3=9)r7c2 - r1c2 = r1c1 - (9=1|7)r4c18 - (1=4)r4c6 - (4=8)r1c6 - (8=1|3)r6c26 - (1=7)r6c9 => r7c9 <> 7; stte. |
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TomC
Joined: 30 Oct 2020
Posts: 359
Location: Wales
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| Posted: Wed Jan 20, 2021 8:34 pm Post subject: |
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When doing these "tricky" ones I find I take about 6 or 7 steps to solve, knowing that most of them do not do anything to actually forward to a solution.
If I look it again: ( forgetting the 7 in r1c7 haha)
r6c5 can't be a 7 because 69 pair in box 5 gives 9 in r4c1 and r1c2 , 3 in r7c2, and a single 1 in both r6c2+9 |
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TomC
Joined: 30 Oct 2020
Posts: 359
Location: Wales
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| Posted: Thu Jan 21, 2021 7:56 am Post subject: |
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| Also r6c5 <>7 because if you stay in rows 6 + 7 you get 7-1-3-9 gives 4 in r7c5 and a UR of 69 rows 5 + 9 |
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immpy
Joined: 06 May 2017
Posts: 574
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| Posted: Thu Jan 21, 2021 6:41 pm Post subject: |
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Hello all,
I don't try to solve in one step, I just make eliminations as warranted. This one can be solved with mostly VH skills. There was one Skyscraper that helped as well, which is why I called it a VH (+?). The purists will say that a Skyscraper is not a VH technique, which in our realm is true. But it is simple enough to understand and implement. This one took me 5 steps, with some rinsing in between.
cheers...immp |
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immpy
Joined: 06 May 2017
Posts: 574
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| Posted: Thu Jan 21, 2021 6:44 pm Post subject: |
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| The rest was done with X-Wings, finned and regular, and ended with an XY-Wing. |
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