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VH 091922

 
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immpy



Joined: 06 May 2017
Posts: 519

PostPosted: Mon Sep 19, 2022 10:12 pm    Post subject: VH 091922 Reply with quote

Hello all, enjoy the puzzle.

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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Clement



Joined: 24 Apr 2006
Posts: 1094
Location: Dar es Salaam Tanzania

PostPosted: Tue Sep 20, 2022 11:36 am    Post subject: VH 091922 Reply with quote

Code:

+-----------------+---------------------+-------------------+
| 349    349   2  | f13   46789   13468 |e137    389   5    |
| 349    8     7  | 5     49      134   | 6      239   1239 |
| 6      5     1  | 2     789     38    | 37     4     389  |
+-----------------+---------------------+-------------------+
|c1589   7     6  | 4     3       2     |d15     89    189  |
| 359    39    4  | 8     1       7     | 235    239   6    |
| 2      13   b38 | 6     5       9     | 4      7     138  |
+-----------------+---------------------+-------------------+
| 7      2    a38 | g1-3  68      1368  | 9      5     4    |
| 48     6     9  | 7     48      5     | 23     1     23   |
| 134    134   5  | 9     2       34    | 8      6     7    |
+-----------------+---------------------+-------------------+

(3=8)r7c3 - r6c3 = (8-5)r4c1 = (5-1)r4c7 = r1c7 - r1c4 = (1)r7c4 => - 1r7c4; btte
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Clement



Joined: 24 Apr 2006
Posts: 1094
Location: Dar es Salaam Tanzania

PostPosted: Wed Sep 21, 2022 12:03 pm    Post subject: Reply with quote

Correction above .....=> -3r7c4
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immpy



Joined: 06 May 2017
Posts: 519

PostPosted: Wed Sep 21, 2022 4:33 pm    Post subject: Reply with quote

Hello all. I didn't attempt to solve this one using only the common VH techniques. I spotted a WXYZ-Wing of (1368) r3c6, r7c456. Hence r9c6<>3=4! stte

cheers...immp
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immpy



Joined: 06 May 2017
Posts: 519

PostPosted: Wed Sep 21, 2022 4:54 pm    Post subject: Reply with quote

The path for using VH techniques exclusively follows.

Step1: XY-Wing 34-8 in r39c6,r8c5=>r13c5,r7c6<>8.
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immpy



Joined: 06 May 2017
Posts: 519

PostPosted: Wed Sep 21, 2022 4:58 pm    Post subject: Reply with quote

Step2: XYZ-Wing 1-37 in r1c47,r3c7=>r1c8<>3.
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immpy



Joined: 06 May 2017
Posts: 519

PostPosted: Wed Sep 21, 2022 5:00 pm    Post subject: Reply with quote

Naked Pair of 89 in column 8. And then Locked Candidates 9 in box6.
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immpy



Joined: 06 May 2017
Posts: 519

PostPosted: Wed Sep 21, 2022 5:02 pm    Post subject: Reply with quote

Step 3: XYZ-Wing 1-34 in r1c4,r29c6=>r13c6<>3.
Basics after that.

cheers...immp
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dongrave



Joined: 06 Mar 2014
Posts: 495

PostPosted: Wed Sep 21, 2022 8:04 pm    Post subject: Reply with quote

Hi immp! Am I wrong? I thought I solved this one with just one VH move? The 134 XYZ Wing with pivot at r2c6 and tips at r1c4 and r9c6 (-3r13c6).
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immpy



Joined: 06 May 2017
Posts: 519

PostPosted: Thu Sep 22, 2022 11:45 pm    Post subject: Reply with quote

Heh heh, not wrong at all there dongrave. That does indeed solve it with one VH move. Good eye!

cheers...immp
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