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Vanhegan Extreme Nov 20

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tlanglet

Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

Posted: Sat Nov 20, 2010 10:28 pm Post subject: Vanhegan Extreme Nov 20

Code:

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

Play this puzzle online at the Daily Sudoku site

My first pass was two steps.....

Quote:

AUR(36)r27c23 external SIS r5c2=3,r1c1=6,r9c3=6; r5c1=2
(3)r5c2-(2)r5c2=(2)r5c1;
||
(6)r1c1-(2)r1c1=(2)r5c1;
||
(6)r9c3-(6=5)r6c3-r6c7=r5c8-(5=9)r3c8-(9=2)r3c3-r1c1=(2)r5c1;

xy-wing 26-8 vertex (26)r7c2; r9c5<>8

Ted

keith

Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

Posted: Sat Nov 20, 2010 11:55 pm Post subject:

Ted,

Is this the original puzzle? There seem to be a lot of givens. Anyway:

Code:

+----------------+----------------+----------------+
| 236 8 4 | 5 7 9 | 236 1 26 |
| 5 36 369 | 8 1 2 | 369 4 7 |
| 7 1 29 | 3 4 6 | 259 59 8 |
+----------------+----------------+----------------+
| 38 9 7 | 2 5 138 | 18 6 4 |
| 238 235 1 | 4 6 38 | 7 58 9 |
| 68 4 56 | 7 9 18 | 158 2 3 |
+----------------+----------------+----------------+
| 9 236 2368 | 1 28 4 | 268 7 5 |
| 4 25 258 | 6 3 7 | 289 89 1 |
| 1 7 268 | 9 28 5 | 4 3 26 |
+----------------+----------------+----------------+

M-wing 25 takes out 2 in R789C3.

W-wing 26 takes out 6 in R8C7, and the puzzle is toast.

Keith Cool

Marty R.

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

Posted: Sun Nov 21, 2010 2:38 am Post subject:

That's not the original. http://www.playr.co.uk/sudoku/index.php?class=6&date=2010-11-20

keith

Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

Posted: Sun Nov 21, 2010 3:09 am Post subject:

Yes,

Here is the original:

Code:

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

Keith

peterj

Joined: 26 Mar 2010
Posts: 974
Location: London, UK

Posted: Sun Nov 21, 2010 9:21 am Post subject:

Here's a one-stepper...

Code:

Almost xy-wing(25-9) r8c3 fin (5)r8c3
xy-wing (9=2)r3c3 - (2=8)r8c3 - (8=9)r8c8 ; r3c8<>9
||
(5)r8c3 - r6c3=r5c2 - r5c8=r3c8 ; r3c8<>9

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