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VH (+?) 011921

 
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immpy



Joined: 06 May 2017
Posts: 377

PostPosted: Tue Jan 19, 2021 6:48 pm    Post subject: VH (+?) 011921 Reply with quote

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 . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

cheers...immp
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TomC



Joined: 30 Oct 2020
Posts: 27
Location: Wales

PostPosted: Wed Jan 20, 2021 3:17 pm    Post subject: Reply with quote

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: 402

PostPosted: Wed Jan 20, 2021 6:11 pm    Post subject: Reply with quote

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   |
+-------------+--------------+-----------+

(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: 27
Location: Wales

PostPosted: Wed Jan 20, 2021 8:34 pm    Post subject: Reply with quote

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: 27
Location: Wales

PostPosted: Thu Jan 21, 2021 7:56 am    Post subject: Reply with quote

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: 377

PostPosted: Thu Jan 21, 2021 6:41 pm    Post subject: Reply with quote

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: 377

PostPosted: Thu Jan 21, 2021 6:44 pm    Post subject: Reply with quote

The rest was done with X-Wings, finned and regular, and ended with an XY-Wing.
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