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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 933
Location: Rimini, Italy
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 Posted: Sun Jun 12, 2022 10:04 am Post subject: Jun 12 VH |
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Hi everyone,
| Code: |
+--------------+-----------+------------+
| 4 28 16 | 7 19 3 | 28 159 56 |
| 16 23 7 | 169 5 8 | 23 19 4 |
| 58 358 9 | 16 2 4 | 138 7 36 |
+--------------+-----------+------------+
| 9 6 8 | 2 4 7 | 5 3 1 |
| 3 7 5 | 8 19 19 | 4 6 2 |
| 2 1 4 | 3 6 5 | 9 8 7 |
+--------------+-----------+------------+
| 7 4 12 | 159 3 19 | 6 125 8 |
| 15 9 123 | 4 8 6 | 7 125 35 |
| 1568 58 136 | 15 7 2 | 13 4 9 |
+--------------+-----------+------------+
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Play this puzzle online at the Daily Sudoku site
| Quote: | W-Wing
1,9 r1c5,r2c8 SL with number 1 in r3c47 and -9 in r1c8,r2c4
1,9 r1c5,r2c8 SL with number 1 in r1c3,r2c1 and -9 in r1c8,r2c4
1,6 r1c3,r3c4 SL with number 6 in r2c14 and -1 in r1c5
1,6 r1c3,r3c4 SL with number 6 in r13c9 and -1 in r1c5
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Ciao Gianni |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Sun Jun 12, 2022 10:38 am Post subject: |
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Another one-step solution is a=5 to solve
| Code: |
+---------------+------------+--------------+
| 4 28 e16 | 7 19 3 | 28 159 d56 |
| 16 23 7 | 169 5 8 | 23 19 4 |
| 58 358 9 | 16 2 4 | 138 7 36 |
+---------------+------------+--------------+
| 9 6 8 | 2 4 7 | 5 3 1 |
| 3 7 5 | 8 19 19 | 4 6 2 |
| 2 1 4 | 3 6 5 | 9 8 7 |
+---------------+------------+--------------+
| 7 4 12 | 159 3 19 | 6 125 8 |
| 15 9 123 | 4 8 6 | 7 125 c35 |
| 1568 58 136 | a15 7 2 | b13 4 9 |
+---------------+------------+--------------+
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If a=1 then follow the chain to make e=1 leaving no room for <1> in box 2 |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Sun Jun 12, 2022 10:44 am Post subject: |
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| Gianni, aren't these VH puzzles meant to be solvable with X, XY or XYZ wings? |
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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 933
Location: Rimini, Italy
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| Posted: Sun Jun 12, 2022 12:22 pm Post subject: |
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Hi TomC
Not sure.
Maybe yes, but not always in one step, as in this case.
Ciao Gianni |
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dongrave
Joined: 06 Mar 2014
Posts: 568
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| Posted: Sun Jun 12, 2022 1:46 pm Post subject: |
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| TomC wrote: | | Gianni, aren't these VH puzzles meant to be solvable with X, XY or XYZ wings? |
Yes Tom! Marty told me years ago that all VH puzzles on this site can be solved using just the 3 wings that you mentioned. Marty coined these solutions as 'Standard Solutions' (since they only use 'Standard' VH moves). This one looks like it requires 3 standard VH moves. There's a 35-1 XY-Wing with pivot at r8c9 which removes the 1's from r8c8 and r9c13. That opens up an X-Wing on 1's in rows 3 and 9 which removes the 1 from r2c4. That opens up a 19-6 XY-Wing with pivot at r1c5 (and also a 69-1 XY-Wing with pivot at r2c4) which solves the puzzle. |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Sun Jun 12, 2022 2:13 pm Post subject: |
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Thanks, dongrave! I can solve these puzzles in my usual way, but if I know that wings can be used I try that as well.
I kicked off with the 35-1 XY as you say, then a 15-2 XY but missed the X wing completely so didn't get any further!
Like you say, multiple steps are not better or worse than a one stepper! |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Sun Jun 12, 2022 2:35 pm Post subject: |
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| Absolutely. I think getting to understand different solving techniques is more important than step count. Variety is also the spice of sudoku life imho. |
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