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Puzzle (#62) 11/12/29: Two of Four

 
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SudoQ



Joined: 02 Aug 2011
Posts: 127

PostPosted: Thu Dec 29, 2011 5:16 pm    Post subject: Reply with quote

r6c9=2 -> no space for 7 in c4 (via r3, r8 and c1)
/SudoQ
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Marty R.



Joined: 12 Feb 2006
Posts: 5179
Location: Rochester, NY, USA

PostPosted: Fri Dec 30, 2011 12:48 am    Post subject: Reply with quote

This gave me a load of trouble. After a half-dozen moves all I could do was Medusa my way out of it.
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keith



Joined: 19 Sep 2005
Posts: 3184
Location: near Detroit, Michigan, USA

PostPosted: Fri Dec 30, 2011 1:50 am    Post subject: Reply with quote

After basics:
Code:
+-------------------+-------------------+-------------------+
| 8     13    156   |-25679 259   25679 | 4    @237  -257   |
| 56    7     9     |#256   4     3     |@25    8     1     |
| 35    2     4     | 57    1     8     | 6     37    9     |
+-------------------+-------------------+-------------------+
| 4     6     57    | 8     259   259   | 257   1     3     |
| 235   13    15    |-256   7     256   | 9     4     8     |
| 257   9     8     | 1     3     4     | 257   6     25    |
+-------------------+-------------------+-------------------+
| 1     5     2     | 3     6     79    | 8     79    4     |
| 679   4     67    |#279   8     1     | 3     5    $267   |
| 679   8     3     | 4     259   2579  | 1    $279  -267   |
+-------------------+-------------------+-------------------+
I find one of these a year, which is a relief since there are only two days left!

A really twisted franken swordfish.

Note the strong links on 2 in R2, R8, C8. They make a cycle. Any cell that sees both cells labelled @, or #, or $ cannot be 2.

For the rest of the puzzle, I don't know. But, I may stay at a Holiday Inn Express tonight!

Keith Laughing Laughing
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arkietech



Joined: 31 Jul 2008
Posts: 1733
Location: Northwest Arkansas USA

PostPosted: Fri Dec 30, 2011 3:06 am    Post subject: Reply with quote

Not pretty.
Code:
 skyscraper 7 => r1c6,r8c4<>7
 *--------------------------------------------------------------------*
 | 8     a13     156    |f25679  259    2569   | 4     b27-3   257    |
 | 56     7      9      | 256    4      3      | 25     8      1      |
 | 5-3    2      4      |g57     1      8      | 6     h37     9      |
 |----------------------+----------------------+----------------------|
 | 4      6      57     | 8      259    259    | 257    1      3      |
 | 235    13     15     | 256    7      256    | 9      4      8      |
 | 257    9      8      | 1      3      4      | 257    6      25     |
 |----------------------+----------------------+----------------------|
 | 1      5      2      | 3      6      79     | 8      79     4      |
 | 679    4      67     |e29     8      1      | 3      5     d267    |
 | 679    8      3      | 4      259    2579   | 1     c279    267    |
 *--------------------------------------------------------------------*
aic
(3)r1c2=(3-2)r1c8=(2)r9c8-(2)r8c9=(2-9)r8c4=(9-7)r1c4=(7)r3c4-(7=3)r3c8 => r1c8,r3c1<>3
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Fri Dec 30, 2011 5:15 am    Post subject: Reply with quote

This puzzle has several extraneous eliminations. I was afraid they might create a lot of frustration.

Hint wrote:
Sashimi X-Wings (plural!).


Keith (nice find!): mutant Swordfish r28c8\c4b39
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JC Van Hay



Joined: 13 Jun 2010
Posts: 373
Location: Charleroi, Belgium

PostPosted: Fri Dec 30, 2011 8:44 am    Post subject: Reply with quote

Code:
+--------------+----------------------+--------------------+
| 8    13  156 | 56-2(79)  259  25679 | 4    7-3(2)  257   |
| 56   7   9   | 256       4    3     | 25   8       1     |
| 35   2   4   | 5(7)      1    8     | 6    (37)    9     |
+--------------+----------------------+--------------------+
| 4    6   57  | 8         259  259   | 257  1       3     |
| 235  13  15  | 256       7    256   | 9    4       8     |
| 257  9   8   | 1         3    4     | 257  6       25    |
+--------------+----------------------+--------------------+
| 1    5   2   | 3         6    79    | 8    79      4     |
| 679  4   67  | (279)     8    1     | 3    5       67(2) |
| 679  8   3   | 4         259  2579  | 1    79(2)   267   |
+--------------+----------------------+--------------------+

(3=7)r3c8-AHP(7r3c4=79r18c4)-Kite(2r8c4=r8c9-r9c8=r1c8) : -3r1c8, -2r1c4; stte
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Fri Dec 30, 2011 4:25 pm    Post subject: Reply with quote

JC: Thanks for the "Kite" reference to explain r1c4<>2 as an embedded elimination in the AIC.


The best description of my solver's solution for this puzzle? ... extraneous.

2X Sashimi X-Wing and a W-Wing.

Code:
   c7b6  Locked Candidate 2              <> 7    r6c9   extraneous

 +-----------------------------------------------------------------------+
 |  8      13     156    |  25679  259    25679  |  4      237    257    |
 |  56     7      9      |  256    4      3      |  25     8      1      |
 |  35     2      4      |  57     1      8      |  6      37     9      |
 |-----------------------+-----------------------+-----------------------|
 |  4      6      57     |  8      259    259    |  257    1      3      |
 |  235    13     15     |  256    7      256    |  9      4      8      |
 |  257    9      8      |  1      3      4      |  257    6      25     |
 |-----------------------+-----------------------+-----------------------|
 |  1      5      2      |  3      6      79     |  8      79     4      |
 |  679    4      67     |  279    8      1      |  3      5      267    |
 |  679    8      3      |  4      259    2579   |  1      279    267    |
 +-----------------------------------------------------------------------+
 # 64 eliminations remain

 r24\c47 Sashimi X-Wing                  <> 2    r5c4
 c39\r16 Sashimi X-Wing                  <> 5    r6c1

 r28c4   Skyscraper                      <> 2    r1c9        extraneous
 r8c8    2-String Kite                   <> 2    r1c4        extraneous
 r37c8   Skyscraper                      <> 7    r8c4,r1c6   extraneous

 r6  b6  Locked Candidate 2              <> 5    r4c7   extraneous

 <37+5>  XY-Wing  r3c8/r1c9+r3c1         <> 5    r1c3   extraneous

   c1b1  Locked Candidate 1              <> 5    r5c1   extraneous

 <15+6>  XY-Wing  r5c3/r1c3+r5c4         <> 6    r1c4   extraneous

 +--------------------------------------------------------------+
 |  8     13    16    |  579   259   2569  |  4     237   57    |
 |  56    7     9     |  256   4     3     |  25    8     1     |
 |  35    2     4     |  57    1     8     |  6     37    9     |
 |--------------------+--------------------+--------------------|
 |  4     6     57    |  8     259   259   |  27    1     3     |
 |  23    13    15    |  56    7     256   |  9     4     8     |
 |  27    9     8     |  1     3     4     |  257   6     25    |
 |--------------------+--------------------+--------------------|
 |  1     5     2     |  3     6     79    |  8     79    4     |
 |  679   4     67    |  29    8     1     |  3     5     267   |
 |  679   8     3     |  4     259   2579  |  1     279   267   |
 +--------------------------------------------------------------+
 # 54 eliminations remain

 W-Wing    (6=5)r2c1 - r3c1 = r3c4 - (5=6)r5c4  =>  r2c4<>6

Regards, Danny
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oaxen



Joined: 10 Jul 2006
Posts: 96

PostPosted: Tue Jan 03, 2012 10:45 am    Post subject: Reply with quote

Nice to see that yoyu are back in business Danny. I have missed your forum for a very long time. So please go on and post, I like to start everyday with one of your puzzles

Lars
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