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Free Press February 3, 2012

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Feb 04, 2012 5:13 pm    Post subject: Free Press February 3, 2012 Reply with quote
Not yet started ...
Code:
Puzzle: FP020312
+-------+-------+-------+
| . 2 . | . 7 9 | . 4 . |
| 7 . . | . . . | . . . |
| . . 6 | . 8 . | 7 . 1 |
+-------+-------+-------+
| . 4 . | . . . | 6 . . |
| 9 . . | 2 4 3 | . . 8 |
| . . 1 | . . . | . 2 . |
+-------+-------+-------+
| 5 . 8 | . 1 . | 4 . . |
| . . . | . . . | . . 9 |
| . 1 . | . 2 . | . 7 . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

Keith
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Feb 04, 2012 10:29 pm    Post subject: Reply with quote
After basics:
Code:
+-------------------+-------------------+-------------------+
| 1     2     35    | 356   7     9     | 8     4     36    |
| 7     8     3459  | 13456 356   1456  | 2     59    36    |
| 34    359   6     | 345   8     2     | 7     59    1     |
+-------------------+-------------------+-------------------+
| 28    4     25    | 158   9     158   | 6     3     7     |
| 9     6     7     | 2     4     3     | 5     1     8     |
| 38    35    1     | 7     56    568   | 9     2     4     |
+-------------------+-------------------+-------------------+
| 5     39    8     | 39    1     7     | 4     6     2     |
| 2346  7     234   | 3456  356   456   | 1     8     9     |
| 46    1     49    | 4689  2     468   | 3     7     5     |
+-------------------+-------------------+-------------------+
Keith
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Feb 04, 2012 11:08 pm    Post subject: Reply with quote
Here's a sort of extreme but interesting almost one-stepper:
Code:
+-------------------+-------------------+-------------------+
| 1     2    A35    | 356   7     9     | 8     4     36    |
| 7     8     3459  | 13456 356   1456  | 2     59   D36    |
| 34    359   6     |E345   8     2     | 7     59    1     |
+-------------------+-------------------+-------------------+
| 28    4     25    | 158   9     158   | 6     3     7     |
| 9     6     7     | 2     4     3     | 5     1     8     |
|C38   B35    1     | 7     56    568   | 9     2     4     |
+-------------------+-------------------+-------------------+
| 5    G39    8     | 39    1     7     | 4     6     2     |
| 2346  7     234   | 3456 F356   456   | 1     8     9     |
| 46    1     49    | 4689  2     468   | 3     7     5     |
+-------------------+-------------------+-------------------+

(Ignoring the swordfish)
First, M-wing: 5 in A forces 5 on B, AC are pincers on 3.

(Then, ignoring the X-wing. Nothing fishy here!)

Second, coloring from 3 in A forces 3 in DEFGC. C is 3.

Huh Question

A is 3 or 5. The M-wing says if A is 5, C is 3. The coloring says if A is 3, C is 3. C is 3 for any possibility in A.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Feb 05, 2012 12:31 am    Post subject: Reply with quote
I used your M-Wing followed by a W-Wing on 35 which was exposed by removing the 4 from r3c4, SL 3 in r7.
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sun Feb 05, 2012 9:33 am    Post subject: Reply with quote
keith wrote:
Code:
+-------------------+-------------------+-------------------+
| 1     2    A35    | 356   7     9     | 8     4     36    |
| 7     8     3459  | 13456 356   1456  | 2     59   D36    |
| 34    359   6     |E345   8     2     | 7     59    1     |
+-------------------+-------------------+-------------------+
| 28    4     25    | 158   9     158   | 6     3     7     |
| 9     6     7     | 2     4     3     | 5     1     8     |
|C38   B35    1     | 7     56    568   | 9     2     4     |
+-------------------+-------------------+-------------------+
| 5    G39    8     | 39    1     7     | 4     6     2     |
| 2346  7     234   | 3456 F356   456   | 1     8     9     |
| 46    1     49    | 4689  2     468   | 3     7     5     |
+-------------------+-------------------+-------------------+

(Ignoring the swordfish)
First, M-wing: 5 in A forces 5 on B, AC are pincers on 3.

(Then, ignoring the X-wing. Nothing fishy here!)

Second, coloring from 3 in A forces 3 in DEFGC. C is 3.

A is 3 or 5. The M-wing says if A is 5, C is 3. The coloring says if A is 3, C is 3. C is 3 for any possibility in A.

Alternate:

5 in A forces r3c2,r4c3<>5

3 in A forces 3 in DFG which forces 5 in B and r3c2,r4c3<>5

Equivalent to a 5-SIS W-Wing:

(5=3)r1c3 - r1c9 = r2c9 - r2c5 = r8c5 - r7c4 = r7c2 - (3=5)r6c2 => r3c2,r4c3<>5
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sun Feb 05, 2012 3:26 pm    Post subject: Reply with quote
An almost xy-wing also does the deed..............

xy-wing(34-5)r3c14+r1c3=(3)r3c4-r7c4=r7c2-(3=5)r6c2; r3c2<>5

Ted
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Mon Feb 06, 2012 6:18 pm    Post subject: Free Press February 3, 2012 Reply with quote
The 4 cell XY-Chain:-
If r6c1=8, then r4c1=2 =>r4c3=5 =>r1c3=3; r3c1<>3 opens an x-wing on 3 in row 37; r6c2<>3 solves it.
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