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Puzzle 10/08/29: C

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sun Aug 29, 2010 4:41 pm Post subject: Puzzle 10/08/29: C

Code:

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

Play this puzzle online at the Daily Sudoku site

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Sun Aug 29, 2010 11:53 pm Post subject:

Code:

+------------+---------------+-------------------+
| 1 49 3 | 6 8 7-9 | 279 247-9 5 |
| 5 49 8 | 2 19 137-9 | 3679 3467-9 34 |
| 6 7 2 | 5 4 3(9) | 8 3(9) 1 |
+------------+---------------+-------------------+
| 4 8 5 | 37 16 16 | 237 237 9 |
| 2 13 9 | 37 5 8 | 4 137 6 |
| 37 6 17 | 9 2 4 | 13 5 8 |
+------------+---------------+-------------------+
| 8 13 6 | 14 7 2(9) | 5 34(9) 234 |
| 37 5 17 | 14 69 26-9 | 39 8 234 |
| 9 2 4 | 8 3 5 | 16 16 7 |
+------------+---------------+-------------------+

#1... X-wing 9; r128c68 <> 9

---------------

Code:

+------------+------------+-------------------+
| 1 49 3 | 6 8 7 | 2-9 24 5 |
| 5 49 8 | 2 19 13 | 67 67 34 |
| 6 7 2 | 5 4 39 | 8 (39) 1 |
+------------+------------+-------------------+
| 4 8 5 | 37 16 16 | 27(3) 27(3) 9 |
| 2 13 9 | 37 5 8 | 4 17(3) 6 |
| 37 6 17 | 9 2 4 | 1(3) 5 8 |
+------------+------------+-------------------+
| 8 13 6 | 14 7 29 | 5 34-9 234 |
| 37 5 17 | 14 69 26 | (39) 8 234 |
| 9 2 4 | 8 3 5 | 16 16 7 |
+------------+------------+-------------------+

(9=3)r3c8 - (3)r45c8 = (3)r46c7 - (3=9)r8c7; r1c7 and r7c8 <> 9

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Mon Aug 30, 2010 12:06 am Post subject:

Norm, Your second step looks like a W-Wing using a grouped strong link.

JC Van Hay

Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

Posted: Mon Aug 30, 2010 8:39 am Post subject:

Quote:

Equivalent to Norm's proof ...

X Wing on 9 : (9)R37/c68 : =>r128c68<>9
XY Wing Style: 4C8 (43)R2C9 (39)R3C8 : (4)r7c8=(9)r3c8 => r7c8<>9

Marty R.

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

Posted: Mon Aug 30, 2010 9:57 pm Post subject:

The W-Wing on 39 was enough for me.

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