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Free Press December 16, 2011

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Dec 17, 2011 3:00 pm    Post subject: Free Press December 16, 2011 Reply with quote
Not yet started.
Code:
Puzzle: FP121611
+-------+-------+-------+
| . . . | 1 . 9 | . . . |
| 1 . . | 5 . . | 4 . 3 |
| . 9 . | . . . | . 1 2 |
+-------+-------+-------+
| . . . | . . 6 | 7 . . |
| . 6 . | 2 9 1 | . 8 . |
| . . 4 | 3 . . | . . . |
+-------+-------+-------+
| 6 1 . | . . . | . 4 . |
| 5 . . | . . 3 | . . 6 |
| . . . | 7 . 8 | . . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

Keith
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
PostPosted: Sat Dec 17, 2011 4:02 pm    Post subject: Reply with quote
Death Blossom : ANP(27=8)r8c7.r7c9-(8=3)r7c7-ANQ(3=1259)r56c7.r45c9 => -2r89c7, -2r4c8
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Sat Dec 17, 2011 6:13 pm    Post subject: Reply with quote
Code:
 *-----------------------------------------------------------*
 | 2348  345   2358  | 1     238   9     | 6     57    78    |
 | 1     278   6     | 5     278   27    | 4     9     3     |
 | 378   9     3578  | 6     378   4     | 58    1     2     |
 |-------------------+-------------------+-------------------|
 | 29   c35    1     | 8     4     6     | 7    b235  d9-5   |
 | 37    6     357   | 2     9     1     | 35    8     4     |
 | 289   28    4     | 3     57    57    | 129   6     19    |
 |-------------------+-------------------+-------------------|
 | 6     1     37    | 9     25    25    | 38    4     78    |
 | 5     278   2789  | 4     1     3     | 29    27    6     |
 | 234   34    239   | 7     6     8     | 129  a235  e15-9  |
 *-----------------------------------------------------------*

s-wing
3)r9c8=(3)r4c8-(3=5)r4c2-(5)r4c9=(5)r9c9 => r9c8<>5

Chain corrected..Thanks Danny!

Last edited by arkietech on Sat Dec 17, 2011 8:50 pm; edited 1 time in total
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SudoQ



Joined: 02 Aug 2011
Posts: 127
PostPosted: Sat Dec 17, 2011 6:49 pm    Post subject: Reply with quote
This is a short one:
Code:
r1c8/r3c7=5, (r7c7=8) => r9c8<>5 
/SudoQ
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Dec 17, 2011 8:23 pm    Post subject: Reply with quote
arkietech wrote:
Is this an s-wing?
(5-3)r9c8=(3)r4c8-(3=5)r4c2-(5)r4c9=(5)r9c9 => r4c9<>5, r9c9<>9

No. Your chain is invalid. However, it can be corrected to be an S-Wing.

(3)r9c8=(3)r4c8-(3=5)r4c2-(5)r4c9=(5)r9c9 => r9c8<>5

Regards, Danny
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Dec 17, 2011 9:06 pm    Post subject: Reply with quote
JC Van Hay wrote:
Death Blossom : ANP(27=8)r8c8.r7c9-(8=3)r7c7-ANQ(3=1259)r56c7.r46c9 => -2r89c7, -2r4c8

I was able to follow your logic; but I would have written it as an XY-Chain with memory:

(2=7=8=3=5=9*=1=*2)r8c8,r7c9,r7c7,r5c7,r4c9,r6c9,r6c7 => r4c8,r89c7<>2

Code:
 +--------------------------------------------------------------+
 |  2348  345   2358  |  1     238   9     |  6     57    78    |
 |  1     278   6     |  5     278   27    |  4     9     3     |
 |  378   9     3578  |  6     378   4     |  58    1     2     |
 |--------------------+--------------------+--------------------|
 |  29    35    1     |  8     4     6     |  7     35-2 e59    |
 |  37    6     357   |  2     9     1     | d35    8     4     |
 |  289   28    4     |  3     57    57    | g129   6    f19    |
 |--------------------+--------------------+--------------------|
 |  6     1     37    |  9     25    25    | c38    4    b78    |
 |  5     278   2789  |  4     1     3     |  9-2  a27    6     |
 |  234   34    239   |  7     6     8     |  19-2  235   159   |
 +--------------------------------------------------------------+

Regards, Danny A. Jones
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Dec 17, 2011 9:34 pm    Post subject: Reply with quote
I couldn't find the magic bullet and used six easy moves. There were plenty of easy moves available but I needed too many of them.
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
PostPosted: Sat Dec 17, 2011 10:20 pm    Post subject: Reply with quote
Marty,

There is no need for a "secret or magic bullet".

In my own case, in the present puzzle, I started wild coloring (Aran's RGT) from B3. I immediately, and fortunately, found -2r89c7, -2r4c8.
The interpretation of these eliminations is straightforwardly given by a t-Chain, as given by Danny.
However, as that chain is based on cell base sets only, I reinterpreted the eliminations as due to a wing having here the special name of Death Blossom.
That's it ! Nevertheless, a nicer solution is given by Dan's S-Wing !

Best Regards, JC.
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