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Free Press, January 13, 2012

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keith

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

Posted: Sat Jan 14, 2012 1:03 am Post subject: Free Press, January 13, 2012

As almost always, not yet started.

Code:

Puzzle: FP011312
+-------+-------+-------+
| . 2 1 | . . . | 8 . . |
| . 5 . | . . 1 | . 7 . |
| 7 . . | . 9 . | . . . |
+-------+-------+-------+
| . . . | 6 . . | . . 3 |
| . 6 . | . . . | . 5 . |
| 5 . . | 2 . 7 | . . 4 |
+-------+-------+-------+
| . . . | . 2 . | . . 5 |
| . 3 . | 4 . 5 | . 1 . |
| . . . | . . . | 9 4 . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

Keith

Marty R.

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

Posted: Sat Jan 14, 2012 2:53 am Post subject:

W-Wing (69), SL 6 in c8, flightless with transport; r5c9<>9.

arkietech

Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

Posted: Sat Jan 14, 2012 7:31 am Post subject:

Code:

*-----------------------------------------------------------*
| 36 2 1 | 5 7 4 | 8 369 69 |
| 389 5 389 | 38 6 1 | 4 7 2 |
| 7 48 3468 | 38 9 2 | 5 36 1 |
|-------------------+-------------------+-------------------|
| 4-8 479-8 47-8 | 6 5 d89 | 1 2 3 |
|b138 6 2 | 19 4 c389 | 7 5 89 |
| 5 189 a38 | 2 13 7 | 6 89 4 |
|-------------------+-------------------+-------------------|
| 1468 1478 4678 | 179 2 69 | 3 68 5 |
| 69 3 679 | 4 8 5 | 2 1 67 |
| 2 178 5 | 17 13 36 | 9 4 678 |
*-----------------------------------------------------------*
m-wing
(8=3)r6c3-(3)r5c1=(3-8)r5c6=(8)r4c6 => r4c123<>8

keith

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

Posted: Thu Jan 26, 2012 1:49 am Post subject:

After basics:

Code:

+----------------+----------------+----------------+
| 36 2 1 | 5 7 4 | 8 369 69 |
| 389 5 389 | 38 6 1 | 4 7 2 |
| 7 48 3468 | 38 9 2 | 5 36 1 |
+----------------+----------------+----------------+
| 48 4789 478 | 6 5 89 | 1 2 3 |
| 138 6 2 |a19 4 389 | 7 5 8-9 |
| 5 b189 38 | 2 13 7 | 6 c89 4 |
+----------------+----------------+----------------+
| 1468 1478 4678 | 179 2 69 | 3 68 5 |
| 69 3 679 | 4 8 5 | 2 1 67 |
| 2 178 5 | 17 13 36 | 9 4 678 |
+----------------+----------------+----------------+

M-wing: 1 in a forces 1 in b; Not 9 in b forces 9 in c. ac are pincers on 9.

How sweet it is! (But, no more sweet than Dan's m-wing.)

Keith

SudoQ

Joined: 02 Aug 2011
Posts: 127

Posted: Thu Jan 26, 2012 9:40 am Post subject:

It is also easy to show that r4c6<>9. -> r5c4=1 -> contradiction in q4. /SudoQ

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