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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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 Posted: Tue Oct 06, 2015 9:09 am Post subject: Oct 6 VH |
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After basics:
| Code: |
+--------+----------+-----------+
| 6 2 39 | 57 357 1 | 8 4 79 |
| 4 1 7 | 6 9 8 | 3 2 5 |
| 5 8 39 | 2 37 4 | 1 79 6 |
+--------+----------+-----------+
| 2 3 1 | 9 6 7 | 4 5 8 |
| 9 6 5 | 8 4 2 | 7 13 13 |
| 7 4 8 | 3 1 5 | 9 6 2 |
+--------+----------+-----------+
| 1 5 24 | 47 278 3 | 6 789 479 |
| 3 7 6 | 45 58 9 | 2 18 14 |
| 8 9 24 | 1 27 6 | 5 37 347 |
+--------+----------+-----------+
|
Play this puzzle online at the Daily Sudoku site
A two-stepper* for a change: | Quote: | | 27-4 XY Wing pivot r9c5 followed by a 49-7 XY Wing pivot r7c9 |
*Unless someone saw it in one...
Hugh |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Tue Oct 06, 2015 11:10 am Post subject: |
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| Code: | +----------+----------------+---------------+
| 6 2 39 | -7(5) 357 1 | 8 4 79 |
| 4 1 7 | 6 9 8 | 3 2 5 |
| 5 8 39 | 2 3(7) 4 | 1 (79) 6 |
+----------+----------------+---------------+
| 2 3 1 | 9 6 7 | 4 5 8 |
| 9 6 5 | 8 4 2 | 7 13 13 |
| 7 4 8 | 3 1 5 | 9 6 2 |
+----------+----------------+---------------+
| 1 5 24 | 47 278 3 | 6 7(89) 479 |
| 3 7 6 | 4(5) (58) 9 | 2 1(8) 14 |
| 8 9 24 | 1 27 6 | 5 37 347 |
+----------+----------------+---------------+ |
5r1c4=5r8c4-(5=8)r8c5-8r8c8=(8-9)r7c8=(9-7)r3c8=7r3c5 :=> r1c4≠7; stte |
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bat999
Joined: 09 Jul 2015
Posts: 55
Location: UK
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| Posted: Tue Oct 06, 2015 8:05 pm Post subject: |
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| Code: | .----------.--------------.----------------.
| 6 2 39 | 5-7 357 1 | 8 4 a79 |
| 4 1 7 | 6 9 8 | 3 2 5 |
| 5 8 39 | 2 37 4 | 1 b79 6 |
:----------+--------------+----------------:
| 2 3 1 | 9 6 7 | 4 5 8 |
| 9 6 5 | 8 4 2 | 7 b13 13 |
| 7 4 8 | 3 1 5 | 9 6 2 |
:----------+--------------+----------------:
| 1 5 24 | c47 278 3 | 6 789 49-7 |
| 3 7 6 | c45 c58 9 | 2 b18 14 |
| 8 9 24 | 1 27 6 | 5 b37 347 |
'----------'--------------'----------------' |
(7=9)r1c9 - (9=8)r3589c8 - (8=7)r7c4,r8c45 => -7 r1c4,r7c9; stte
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roaa
Joined: 18 Apr 2009
Posts: 112
Location: Sweden
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| Posted: Thu Oct 08, 2015 6:47 pm Post subject: Oct 6 VH |
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| The XY-Wing 247, pivot r7c4, solves it in one step. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Oct 09, 2015 12:05 am Post subject: Re: Oct 6 VH |
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| roaa wrote: | | The XY-Wing 247, pivot r7c4, solves it in one step. |
I couldn't do it in one step. Got stuck here.
| Code: |
+--------+----------+---------+
| 6 2 39 | 57 357 1 | 8 4 79 |
| 4 1 7 | 6 9 8 | 3 2 5 |
| 5 8 39 | 2 37 4 | 1 79 6 |
+--------+----------+---------+
| 2 3 1 | 9 6 7 | 4 5 8 |
| 9 6 5 | 8 4 2 | 7 13 13 |
| 7 4 8 | 3 1 5 | 9 6 2 |
+--------+----------+---------+
| 1 5 2 | 47 78 3 | 6 89 49 |
| 3 7 6 | 45 58 9 | 2 18 14 |
| 8 9 4 | 1 2 6 | 5 37 37 |
+--------+----------+---------+
|
Play this puzzle online at the Daily Sudoku site |
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dongrave
Joined: 06 Mar 2014
Posts: 568
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| Posted: Fri Oct 09, 2015 1:58 am Post subject: |
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| Me too Marty. I think Roaa just had an off day (because it doesn't look like it solves it to me either). Roaa's and Hugh's 1st XY Wing both look like they get you to Marty's grid (I think). I was surprised to see Hugh's 2nd move though because I missed his 49-7 XY Wing and instead saw the 89-7 XY Wing with pivot in r7c8 so r3c5<>7 which also solves it. |
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