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Puzzle 10/02/05 (C)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Fri Feb 05, 2010 11:32 am    Post subject: Puzzle 10/02/05 (C) Reply with quote
Rated XY.

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

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: Sat Feb 06, 2010 12:01 am    Post subject: Reply with quote
Two steps are better than four. (no xy's in sight)
Code:
skyscraper 7
 *--------------------------------------------------------------------*
 | 1      4      5679   | 2      57     8      |a357   (3)569  56     |
 | 2      5789   5789   | 3      57     6      | 1      589    4      |
 | 78     5678   3      | 9      4      1      |b578    568    2      |
 |----------------------+----------------------+----------------------|
 | 6      78     78     | 4      1      3      | 25     25     9      |
 | 5      12     12     | 8      6      9      | 4      7      3      |
 | 9      3      4      | 5      2      7      | 6      1      8      |
 |----------------------+----------------------+----------------------|
 | 4      1568   1568   | 7      3      2      | 9      568    56     |
 |d38     2568   2568   | 1      9      4      |c2358  e23568  7      |
 | 37     279    279    | 6      8      5      | 23     4      1      |
 *--------------------------------------------------------------------*
(3)r1c8 = (3-7)r1c7 = (7-8)r3c7 = (8)r8c7 - (8=3)r8c1 - (3)r8c8 = (3)r1c8 => r1c8=3
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Feb 06, 2010 2:49 am    Post subject: Reply with quote
Three standard VH steps.

skyscraper 7,
x-wing 8,
xy--378.

Ted
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Feb 06, 2010 4:36 am    Post subject: Reply with quote
tlanglet wrote:
Three standard VH steps.

skyscraper 7,
x-wing 8,
xy--378.

I get to here after your Skyscraper and X-Wing. I don't see an XY-Wing.

Code:
 +--------------------------------------------------------------+
 |  1     4     5679  |  2     57    8     |  37    39    56    |
 |  2     5789  5789  |  3     57    6     |  1     89    4     |
 |  78    56    3     |  9     4     1     |  78    56    2     |
 |--------------------+--------------------+--------------------|
 |  6     78    78    |  4     1     3     |  25    25    9     |
 |  5     12    12    |  8     6     9     |  4     7     3     |
 |  9     3     4     |  5     2     7     |  6     1     8     |
 |--------------------+--------------------+--------------------|
 |  4     1568  1568  |  7     3     2     |  9     568   56    |
 |  38    256   256   |  1     9     4     |  2358  2356  7     |
 |  37    279   279   |  6     8     5     |  23    4     1     |
 +--------------------------------------------------------------+
 # 51 eliminations remain
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Feb 06, 2010 5:46 am    Post subject: Reply with quote
Ouch! I had nine moves, including four ERs, plus X-Wing, Kite, Coloring, Hidden UR and XYZ-Wing. But I had fun with it.
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sat Feb 06, 2010 8:53 am    Post subject: Reply with quote
skyscraper 7
x-wing 8
remote pair 56

Code:
+------------------+----------+-----------------+
| 1     4     5679 | 2  57  8 | 37    (39)   56 |
| 2     5789  5789 | 3  57  6 | 1     (89)   4  |
| 7(8)  56    3    | 9  4   1 | 7(8)  56     2  |
+------------------+----------+-----------------+
| 6     78    78   | 4  1   3 | 25    25     9  |
| 5     12    12   | 8  6   9 | 4     7      3  |
| 9     3     4    | 5  2   7 | 6     1      8  |
+------------------+----------+-----------------+
| 4     18    1568 | 7  3   2 | 9     568    56 |
| (38)  256   256  | 1  9   4 | 2358  256-3  7  |
| 37    279   279  | 6  8   5 | 23    4      1  |
+------------------+----------+-----------------+

(3=8)r8c1 - (8)r3c1 = (8)r3c7 - (8=9)r2c8 - (9=3)r1c8; r8c8 <> 3
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Feb 06, 2010 3:08 pm    Post subject: Reply with quote
daj95376 wrote:
tlanglet wrote:
Three standard VH steps.

skyscraper 7,
x-wing 8,
xy--378.

I get to here after your Skyscraper and X-Wing. I don't see an XY-Wing.

Code:
 +--------------------------------------------------------------+
 |  1     4     5679  |  2     57    8     |  37    39    56    |
 |  2     5789  5789  |  3     57    6     |  1     89    4     |
 |  78    56    3     |  9     4     1     |  78    56    2     |
 |--------------------+--------------------+--------------------|
 |  6     78    78    |  4     1     3     |  25    25    9     |
 |  5     12    12    |  8     6     9     |  4     7     3     |
 |  9     3     4     |  5     2     7     |  6     1     8     |
 |--------------------+--------------------+--------------------|
 |  4     1568  1568  |  7     3     2     |  9     568   56    |
 |  38    256   256   |  1     9     4     |  2358  2356  7     |
 |  37    279   279   |  6     8     5     |  23    4     1     |
 +--------------------------------------------------------------+
 # 51 eliminations remain


Danny,

Normally I provide more detail about the steps I make, but I was in a hurry and failed to do so on this post. I remember when I was first learning about VH and VH+ techniques and would study other posts, but many times they lacked sufficient detail to be informative.

The xy-wing -378 has the vertex 78 in r3c7, pincer 37 in r1c7 and pincer 38 is a pseudocell in r39c1; r9c7<>3.

Ted
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