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x-chain

 
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Sun Feb 12, 2012 9:30 pm    Post subject: x-chain Reply with quote
au 2/12/12 tough
Code:
 *-----------*
 |.6.|8..|2..|
 |.4.|..2|...|
 |..5|1..|.9.|
 |---+---+---|
 |...|7..|..9|
 |..7|.8.|4..|
 |8..|..1|...|
 |---+---+---|
 |.9.|..3|1..|
 |...|6..|.2.|
 |..3|..5|.6.|
 *-----------*
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Feb 13, 2012 1:24 am    Post subject: Reply with quote
Finned X-Wing in c16; r1c3<>9

Code:

+------------------+------------------+--------------------+
| 1379   6    19   | 8     3459   479 | 2     13457 13457  |
| 1379   4    189  | 359   3569   2   | 35678 13578 135678 |
| 237    2378 5    | 1     346    467 | 3678  9     34678  |
+------------------+------------------+--------------------+
| 123456 1235 1246 | 7     23456  46  | 3568  1358  9      |
| 123569 1235 7    | 2359  8      69  | 4     135   12356  |
| 8      235  2469 | 23459 234569 1   | 3567  357   23567  |
+------------------+------------------+--------------------+
| 24567  9    2468 | 24    247    3   | 1     4578  4578   |
| 1457   157  14   | 6     1479   8   | 3579  2     3457   |
| 1247   1278 3    | 249   12479  5   | 789   6     478    |
+------------------+------------------+--------------------+

Play this puzzle online at the Daily Sudoku site
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Mon Feb 13, 2012 1:33 am    Post subject: Reply with quote
Code:
 *-----------------------------------------------------------------------------*
 | 1379    6       1-9     | 8       3459   a479     | 2       13457   13457   |
 | 1379    4       189     | 359     3569    2       | 35678   13578   135678  |
 | 237     2378    5       | 1       346     467     | 3678    9       34678   |
 |-------------------------+-------------------------+-------------------------|
 | 123456  1235    1246    | 7       23456   46      | 3568    1358    9       |
 |c123569  1235    7       | 2359    8      b69      | 4       135     12356   |
 | 8       235    d2469    | 23459   234569  1       | 3567    357     23567   |
 |-------------------------+-------------------------+-------------------------|
 | 24567   9       2468    | 24      247     3       | 1       4578    4578    |
 | 1457    157     14      | 6       1479    8       | 3579    2       3457    |
 | 1247    1278    3       | 249     12479   5       | 789     6       478     |
 *-----------------------------------------------------------------------------*
x-chain
(9)r1c6=r5c6-r5c1=r6c3 => r1c3<>9
also known as a turbot fish
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Feb 13, 2012 1:43 am    Post subject: Reply with quote
Dan, help me out. I did the puzzle with pencil and paper and finished with the one move. We had the same grids and did the same elimination. Then I tried to confirm my solution by doing it online and got stuck. Do you see what I'm missing?

Code:

+-----------+---------------+-----------------+
| 379 6   1 | 8    359   47 | 2    3457 3457  |
| 379 4   8 | 359  3569  2  | 3567 1357 13567 |
| 37  2   5 | 1    36    47 | 3678 9    34678 |
+-----------+---------------+-----------------+
| 4   135 2 | 7    35    6  | 358  1358 9     |
| 6   135 7 | 235  8     9  | 4    135  1235  |
| 8   35  9 | 2345 2345  1  | 3567 357  23567 |
+-----------+---------------+-----------------+
| 25  9   6 | 24   247   3  | 1    4578 4578  |
| 15  7   4 | 6    19    8  | 359  2    35    |
| 12  8   3 | 249  12479 5  | 79   6    47    |
+-----------+---------------+-----------------+

Play this puzzle online at the Daily Sudoku site
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Mon Feb 13, 2012 2:08 am    Post subject: Reply with quote
Marty R. wrote:
Dan, help me out. I did the puzzle with pencil and paper and finished with the one move. We had the same grids and did the same elimination. Then I tried to confirm my solution by doing it online and got stuck. Do you see what I'm missing?

Code:

+-----------+---------------+-----------------+
| 379 6   1 | 8    359   47 | 2    3457 3457  |
| 379 4   8 | 359  3569  2  | 3567 1357 13567 |
| 37  2   5 | 1    36    47 | 3678 9    34678 |
+-----------+---------------+-----------------+
| 4   135 2 | 7    35    6  | 358  1358 9     |
| 6   135 7 | 235  8     9  | 4    135  1235  |
| 8   35  9 | 2345 2345  1  | 3567 357  23567 |
+-----------+---------------+-----------------+
| 25  9   6 | 24   247   3  | 1    4578 4578  |
| 15  7   4 | 6    19    8  | 359  2    35    |
| 12  8   3 | 249  12479 5  | 79   6    47    |
+-----------+---------------+-----------------+


Look at c5
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Feb 13, 2012 2:43 am    Post subject: Reply with quote
How do I miss this stuff after checking rows, columns and boxes a dozen times? Embarassed
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Mon Feb 13, 2012 3:19 am    Post subject: Reply with quote
Marty R. wrote:
How do I miss this stuff after checking rows, columns and boxes a dozen times? Embarassed


To me quads and ALS's are the hardest to spot. Twisted Evil
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