Dan's Dozy Disaster December 26, 2013

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Dan's Dozy Disaster December 26, 2013

Postby ArkieTech » Thu Dec 26, 2013 12:23 am

Code: Select all
 *-----------*
 |.7.|...|13.|
 |.1.|9..|.7.|
 |5..|.1.|.86|
 |---+---+---|
 |8..|2..|...|
 |3..|186|..2|
 |...|..4|..8|
 |---+---+---|
 |15.|.3.|..7|
 |.3.|..5|.1.|
 |.84|...|.6.|
 *-----------*


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Last edited by ArkieTech on Thu Dec 26, 2013 4:55 pm, edited 1 time in total.
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Re: Dan's Dozy Disaster Disaster

Postby Leren » Thu Dec 26, 2013 12:30 am

Code: Select all
*--------------------------------------------------------------*
| 469   7     689    |d456-8 456   2      | 1     3     459    |
| 246   1     38     | 9     456  a38     | 24    7     45     |
| 5     29    239    | 34    1     7      | 249   8     6      |
|--------------------+--------------------+--------------------|
| 8     469   579    | 2     579  b39     | 36    459   1      |
| 3     49    59     | 1     8     6      | 7     459   2      |
| 279   269   1      |c35    579   4      | 36    59    8      |
|--------------------+--------------------+--------------------|
| 1     5     69     | 468   3     89     | 489   2     7      |
| 2679  3     2679   | 468   2469  5      | 489   1     49     |
| 29    8     4      | 7     29    1      | 5     6     3      |
*--------------------------------------------------------------*

H2 Wing: (8=3) r2c6 - r4c6 = (3-5) r6c4 = (5) r1c4 => - 8 r1c4; stte

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Last edited by Leren on Thu Dec 26, 2013 2:36 am, edited 1 time in total.
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Re: Dan's Dozy Disaster Disaster

Postby SteveG48 » Thu Dec 26, 2013 1:32 am

Code: Select all
 *-----------------------------------------------------------*
 | 469   7     689   | 4568  456   2     | 1     3     459   |
 | 246   1     38    | 9     456  a8-3   | 24    7     45    |
 | 5     29    239   |d34    1     7     | 249   8     6     |
 *-------------------+-------------------+-------------------|
 | 8     469   579   | 2     579   39    | 36    459   1     |
 | 3     49    59    | 1     8     6     | 7     459   2     |
 | 279   269   1     | 35    579   4     | 36    59    8     |
 *-------------------+-------------------+-------------------|
 | 1     5     69    |c468   3    b89    | 489   2     7     |
 | 2679  3     2679  |c468   2469  5     | 489   1     49    |
 | 29    8     4     | 7     29    1     | 5     6     3     |
 *-----------------------------------------------------------*


(3-8)r2c6 = r7c6 - (8=46)r78c4 - (4=3)r3c4 => -3 r2c6 ; stte
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Re: Dan's Dozy Disaster Disaster

Postby pjb » Thu Dec 26, 2013 2:23 am

Code: Select all
469    7      689    | 468-5 c456    2      | 1      3      459   
246    1      38     | 9     c456    38     | 24     7      45     
5      29     239    |b34     1      7      | 249    8      6     
---------------------+----------------------+---------------------
8      469    579    | 2      79-5   39     | 36     459    1     
3      49     59     | 1      8      6      | 7      459    2     
279    269    1      |a35     79-5   4      | 36     59     8     
---------------------+----------------------+---------------------
1      5      69     | 468    3      89     | 489    2      7     
2679   3      2679   | 468    2469   5      | 489    1      49     
29     8      4      | 7      29     1      | 5      6      3     

(5=3) r6c4 - (3=4) r3c4 - (4=56) r12c5 => -5 r1c4, r46c5; stte

Phil

PS Leren, not that it matters, but did you run the X-wing of 4s first?
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Re: Dan's Dozy Disaster Disaster

Postby SteveG48 » Thu Dec 26, 2013 2:40 am

Code: Select all
 *-----------------------------------------------------------*
 | 469   7     689   | 4568  456   2     | 1     3    a459   |
 | 246   1     38    | 9     456  j38    | 24    7     45    |
 | 5   cd29 ceh239   |i34    1     7     |b249   8     6     |
 *-------------------+-------------------+-------------------|
 | 8     469   579   | 2     579   39    | 36    459   1     |
 | 3     49    59    | 1     8     6     | 7     459   2     |
 | 279   269   1     | 35    579   4     | 36    59    8     |
 *-------------------+-------------------+-------------------|
 | 1     5     69    |L468   3    k89    | 489   2     7     |
 | 2679  3    f2679  |L468 gmn2469 5     | 489   1     4-9   |
 | 29    8     4     | 7     29    1     | 5     6     3     |
 *-----------------------------------------------------------*


And now, just for fun, the icky one.

(9)r1c9 = r3c7 - r3c23 = (2)r3c2 - r3c3 = {(2)r8c3-r8c5}|{(3)r3c3 - r3c4 = (3-8)r2c6 = r7c6 - (8=46)r78c4 - (46)r8c5} = (9)r8c5 => -9 r8c9 ; stte
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Re: Dan's Dozy Disaster Disaster

Postby Leren » Thu Dec 26, 2013 2:42 am

pjb wrote: PS Leren, not that it matters, but did you run the X-wing of 4s first?

I did - removed X-Wing and replaced my PM. Thanks.

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Re: Dan's Dozy Disaster December 26, 2013

Postby Marty R. » Thu Dec 26, 2013 9:06 pm

Code: Select all
+---------------+--------------+-------------+
| 469  7   689  | 4568 456  2  | 1   3   459 |
| 246  1   38   | 9    456  38 | 24  7   45  |
| 5    29  239  | 34   1    7  | 249 8   6   |
+---------------+--------------+-------------+
| 8    469 579  | 2    579  39 | 36  459 1   |
| 3    49  59   | 1    8    6  | 7   459 2   |
| 279  269 1    | 35   579  4  | 36  59  8   |
+---------------+--------------+-------------+
| 1    5   69   | 468  3    89 | 489 2   7   |
| 2679 3   2679 | 468  2469 5  | 489 1   49  |
| 29   8   4    | 7    29   1  | 5   6   3   |
+---------------+--------------+-------------+

Play this puzzle online at the Daily Sudoku site

What am I doing wrong? It must be some kind of rookie error.
Playing around with the 49 DP in r45c28.

In c2, r4c2 must be=6.
In r45c8 I'm getting a contradiction. If I say either of the two cells must be=5, then r6c8=9. But if I treat those cells as if it were a Type 4 with an SL on 4, then the 5s come out, leaving r6c8=5. Obviously I can't treat the two cells as a Type 4, but I don't know why.
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Re: Dan's Dozy Disaster December 26, 2013

Postby SteveG48 » Thu Dec 26, 2013 10:37 pm

Marty R. wrote:
Code: Select all
+---------------+--------------+-------------+
| 469  7   689  | 4568 456  2  | 1   3   459 |
| 246  1   38   | 9    456  38 | 24  7   45  |
| 5    29  239  | 34   1    7  | 249 8   6   |
+---------------+--------------+-------------+
| 8    469 579  | 2    579  39 | 36  459 1   |
| 3    49  59   | 1    8    6  | 7   459 2   |
| 279  269 1    | 35   579  4  | 36  59  8   |
+---------------+--------------+-------------+
| 1    5   69   | 468  3    89 | 489 2   7   |
| 2679 3   2679 | 468  2469 5  | 489 1   49  |
| 29   8   4    | 7    29   1  | 5   6   3   |
+---------------+--------------+-------------+

Play this puzzle online at the Daily Sudoku site

What am I doing wrong? It must be some kind of rookie error.
Playing around with the 49 DP in r45c28.

In c2, r4c2 must be=6.
In r45c8 I'm getting a contradiction. If I say either of the two cells must be=5, then r6c8=9. But if I treat those cells as if it were a Type 4 with an SL on 4, then the 5s come out, leaving r6c8=5. Obviously I can't treat the two cells as a Type 4, but I don't know why.


I don't understand your reference to r4c2 being a 6, but if it isn't then you do have a Type 4. However, it's the 9's that come out, not the 5's.
Last edited by SteveG48 on Thu Dec 26, 2013 10:40 pm, edited 1 time in total.
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Re: Dan's Dozy Disaster December 26, 2013

Postby Leren » Thu Dec 26, 2013 10:40 pm

Marty R wrote: But if I treat those cells as if it were a Type 4 with an SL on 4, then the 5s come out, leaving r6c8=5. Obviously I can't treat the two cells as a Type 4, but I don't know why.

I don't see a Type 4 DP (49) r45c28 because of the 6 in r4c2. There are Hidden DP (49) moves using those cells that => r4c8 <> 9 and r4c2 <> 9, because of the XWing of 4's in the DP cells, 2 candidates in r5c2 and the grouped S/L on 9
in Row 5. If there were no 6 in r4c2 then a Type 4 DP would eliminate 9 r45c8, not 5 r45c8, leaving r6c8 = 9. Perhaps this is your problem.

Have a look at this link for a discussion of Type 4 UR's http://hodoku.sourceforge.net/en/tech_ur.php#u4

Hope this helps, Leren
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Re: Dan's Dozy Disaster December 26, 2013

Postby Marty R. » Thu Dec 26, 2013 10:45 pm

Thanks Steve and Leren. Of course in c8 the 9s would come out. I had another senior moment, thinking like it was 45 DP even though it's a 49. :oops: :oops: :oops:
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Re: Dan's Dozy Disaster Disaster

Postby Marty R. » Fri Dec 27, 2013 1:24 am

SteveG48 wrote:
Code: Select all
 *-----------------------------------------------------------*
 | 469   7     689   | 4568  456   2     | 1     3     459   |
 | 246   1     38    | 9     456  a8-3   | 24    7     45    |
 | 5     29    239   |d34    1     7     | 249   8     6     |
 *-------------------+-------------------+-------------------|
 | 8     469   579   | 2     579   39    | 36    459   1     |
 | 3     49    59    | 1     8     6     | 7     459   2     |
 | 279   269   1     | 35    579   4     | 36    59    8     |
 *-------------------+-------------------+-------------------|
 | 1     5     69    |c468   3    b89    | 489   2     7     |
 | 2679  3     2679  |c468   2469  5     | 489   1     49    |
 | 29    8     4     | 7     29    1     | 5     6     3     |
 *-----------------------------------------------------------*


(3-8)r2c6 = r7c6 - (8=46)r78c4 - (4=3)r3c4 => -3 r2c6 ; stte


Identical with just a tiny difference in notation.
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