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Sep 7 VH

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Clement

Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

Posted: Sun Sep 06, 2015 10:37 pm Post subject: Sep 7 VH

Code:

+-------------+--------+------------+
| 8 6 5 | 9 3 2 | 4 7 1 |
| 7 12 12 | 4 5 8 | 36 9 36 |
| 3 4 9 | 6 7 1 | 2 8 5 |
+-------------+--------+------------+
| 15 7 16 | 2 8 49 | 1569 3 46 |
| 9 1235 123 | 7 6 34 | 15 45 8 |
| 4 8 36 | 5 1 39 | 69 2 7 |
+-------------+--------+------------+
| 6 9 7 | 3 4 5 | 8 1 2 |
| 15 135 4 | 8 2 7 | 35 6 9 |
| 2 35 8 | 1 9 6 | 7 45 34 |
+-------------+--------+------------+

XY-Wing 46-9 pivoted in r4c9; r6c6<>9; stte

bat999

Joined: 09 Jul 2015
Posts: 55
Location: UK

Posted: Mon Sep 07, 2015 12:29 am Post subject:

Code:

.---------------.------------.----------------.
| 8 6 5 | 9 3 2 | 4 7 1 |
| 7 12 b12 | 4 5 8 | 36 9 36 |
| 3 4 9 | 6 7 1 | 2 8 5 |
:---------------+------------+----------------:
| 15 7 b16 | 2 8 9-4 | 1569 3 c46 |
| 9 125 b123 | 7 6 a34 | 15 5-4 8 |
| 4 8 36 | 5 1 39 | 69 2 7 |
:---------------+------------+----------------:
| 6 9 7 | 3 4 5 | 8 1 2 |
| 15 135 4 | 8 2 7 | 35 6 9 |
| 2 35 8 | 1 9 6 | 7 45 34 |
'---------------'------------'----------------'

(4=3)r5c6 - (3=6)r245c3 - (6=4)r4c9 => -4 r4c6,r5c8; stte
Cool

Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Mon Sep 07, 2015 5:12 am Post subject:

The grid has a couple of cells with one extra candidate. Also an XYZ-Wing (169) hinged in r4c7=> -6r4c9.

hughwill

Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

Posted: Mon Sep 07, 2015 12:03 pm Post subject:

After basics:

Code:

+------------+--------+------------+
| 8 6 5 | 9 3 2 | 4 7 1 |
| 7 12 12 | 4 5 8 | 36 9 36 |
| 3 4 9 | 6 7 1 | 2 8 5 |
+------------+--------+------------+
| 15 7 16 | 2 8 49 | 1569 3 46 |
| 9 125 123 | 7 6 34 | 15 45 8 |
| 4 8 36 | 5 1 39 | 69 2 7 |
+------------+--------+------------+
| 6 9 7 | 3 4 5 | 8 1 2 |
| 15 135 4 | 8 2 7 | 35 6 9 |
| 2 35 8 | 1 9 6 | 7 45 34 |
+------------+--------+------------+

Play this puzzle online at the Daily Sudoku site

I couldn't get rid of the 5 in r4c7 to see Marty's XYZ wing- except if r4c7 were
5 then r5c8=4 and r4c9=6. Then since r4c6 cannot be both of r4's needed 4 and 9
this answer is impossible. Therefore 5 can be removed from r4c7 and the
XYZ wing stands......or have I lost the plot somewhere?

Hugh

Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Mon Sep 07, 2015 2:46 pm Post subject:

Quote:

or have I lost the plot somewhere?

No, I have. Embarassed

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