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MM 1349 March 20

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storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Fri Mar 20, 2009 6:31 am Post subject: MM 1349 March 20

Code:

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

Play this puzzle online at the Daily Sudoku site

probably a VH+
but definitely fun.

keith

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

Posted: Fri Mar 20, 2009 9:10 pm Post subject:

Here's something that is probably a bit different. You can solve this by attacking <4>. After basics:

Code:

+-------------+-------------+-------------+
| 46 1 7 | 346 34 8 | 59 2 59 |
| 5 38 38 | 7 9 2 | 6 1 4 |
| 2 49 469a| 5 1 46b | 3 7 8 |
+-------------+-------------+-------------+
| 46 35 35 | 9 46 7 | 1 8 2 |
| 9 48 1 | 48 2 5 | 7 3 6 |
| 7 2 68 | 1 68 3 | 4 59 59 |
+-------------+-------------+-------------+
| 1 459 2 | 346 345 46b | 8 569 7 |
| 3 7 45a |-468 -458 9 | 2 56 1 |
| 8 6 59 | 2 7 1 | 59 4 3 |
+-------------+-------------+-------------+

The skyscraper aa and bb takes out two <4>'s as shown, leading to:

Code:

+-------------+-------------+-------------+
| 46 1 7 | 346 34 8 | 59 2 59 |
| 5 38 38 | 7 9 2 | 6 1 4 |
| 2 49c 69 | 5 1 46b | 3 7 8 |
+-------------+-------------+-------------+
| 46 35 35 | 9 46f 7 | 1 8 2 |
| 9 48d 1 | 48e 2 5 | 7 3 6 |
| 7 2 68 | 1 68 3 | 4 59 59 |
+-------------+-------------+-------------+
| 1 59 2 | 346 3-45 46a| 8 569 7 |
| 3 7 4 | 68 58 9 | 2 56 1 |
| 8 6 59 | 2 7 1 | 59 4 3 |
+-------------+-------------+-------------+

First, note the hidden (Type 6) UR <34>. R7C4 cannot be <4>, for that forces a Deadly Pattern in R17C45. Then, coloring on <4> abcdef takes out <4> in R7C5. Cell a must be <4> (in R7), and the puzzle is solved.

Keith

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Fri Mar 20, 2009 10:04 pm Post subject:

Keith, very nice.

keith

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

Posted: Fri Mar 20, 2009 11:16 pm Post subject:

storm_norm wrote:

Keith,
very nice.

Norm,

Thank you! I don't know what other solution paths there are, but it is rare to see a Type-6 UR that helps to nail a puzzle.

Keith Smile

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