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Vanhegan fiendish September 6, 2012

 
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arkietech



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

PostPosted: Fri Sep 07, 2012 5:26 am    Post subject: Vanhegan fiendish September 6, 2012 Reply with quote

Code:

 *-----------*
 |...|.9.|.83|
 |9..|15.|.2.|
 |...|2.7|...|
 |---+---+---|
 |.98|...|.4.|
 |5..|6.2|..9|
 |.1.|...|65.|
 |---+---+---|
 |...|3.5|...|
 |.3.|.19|..4|
 |17.|.6.|...|
 *-----------*
 

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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Fri Sep 07, 2012 7:02 am    Post subject: Reply with quote

Code after Basics
Code:

+------------+----------+--------------+
| 7   2  1   | 4 9   6  | 5    8   3   |
| 9   68 -346 | 1 5   *38 | 47   2   67  |
| *348 5  346 | 2 38  7  | 149  19  16  |
+------------+----------+--------------+
| 6   9  8   | 5 37  1  | 237  4   27  |
| 5   4  37  | 6 378 2  | 1378 137 9   |
| *23  1  237 | 9 4   *38 | 6    5   78  |
+------------+----------+--------------+
| 48  68 469 | 3 2   5  | 1789 179 178 |
| 28  3  5   | 7 1   9  | 28   6   4   |
| 1   7  29  | 8 6   4  | 2 39  39  5   |
+------------+----------+--------------+
Skyscraper on 3 in r6c16; r2c3<>3.
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arkietech



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

PostPosted: Fri Sep 07, 2012 12:17 pm    Post subject: Reply with quote

Another method with same result:
Code:

 *-----------------------------------------------------------*
 | 7     2     1     | 4     9     6     | 5     8     3     |
 | 9     68    46-3  | 1     5    a38    | 47    2     67    |
 | 348   5     346   | 2     38    7     | 149   19    16    |
 |-------------------+-------------------+-------------------|
 | 6     9     8     | 5     37    1     | 37    4     2     |
 | 5     4    d37    | 6     378   2     | 1378  137   9     |
 |c23    1    c237   | 9     4    b38    | 6     5     78    |
 |-------------------+-------------------+-------------------|
 | 48    68    469   | 3     2     5     | 1789  179   178   |
 | 28    3     5     | 7     1     9     | 28    6     4     |
 | 1     7     29    | 8     6     4     | 239   39    5     |
 *-----------------------------------------------------------*
Empty Rectangle (ER)
3r2c6=r6c6-r6c13=3r5c3 => -3r2c3; stte

if r2c6 is not a 3 then r5c3 is a 3

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Marty R.



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

PostPosted: Fri Sep 07, 2012 3:58 pm    Post subject: Reply with quote

arkietech wrote:
Another method with same result:
Code:

 *-----------------------------------------------------------*
 | 7     2     1     | 4     9     6     | 5     8     3     |
 | 9     68    46-3  | 1     5    a38    | 47    2     67    |
 | 348   5     346   | 2     38    7     | 149   19    16    |
 |-------------------+-------------------+-------------------|
 | 6     9     8     | 5     37    1     | 37    4     2     |
 | 5     4    d37    | 6     378   2     | 1378  137   9     |
 |c23    1    c237   | 9     4    b38    | 6     5     78    |
 |-------------------+-------------------+-------------------|
 | 48    68    469   | 3     2     5     | 1789  179   178   |
 | 28    3     5     | 7     1     9     | 28    6     4     |
 | 1     7     29    | 8     6     4     | 239   39    5     |
 *-----------------------------------------------------------*
Empty Rectangle (ER)
3r2c6=r6c6-r6c13=3r5c3 => -3r2c3; stte

if r2c6 is not a 3 then r5c3 is a 3

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Two more possibilities.

1) XY-Wing (238), pivot r6c1, flightless, with transport from r8c1 to r2c2; r2c6<>8.

2) M-Wing (38) in r2c6 and r3c1; pincer 3; r6c6<>3.
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Fri Sep 07, 2012 5:58 pm    Post subject: Vanhagen fiendish September 6, 2012 Reply with quote

arkietech
Thanks, you have reminded me of the ER's. I have almost stoped looking for them because they occur rarely. However they are good and fun. There are two ER's in this puzzle based on 3's, the one in BOX 2 removes the 3 in r6c6 and the other in BOX 4 removes the 3 in r2c3 Very Happy.
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