May 13, 2014

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May 13, 2014

Postby ArkieTech » Mon May 12, 2014 11:21 pm

Code: Select all
 *-----------*
 |9..|.2.|6..|
 |.6.|...|.2.|
 |.32|6..|..7|
 |---+---+---|
 |..9|.7.|..8|
 |81.|.6.|.35|
 |3..|.1.|2..|
 |---+---+---|
 |5..|..1|78.|
 |.9.|...|.4.|
 |..3|.9.|..2|
 *-----------*


Play/Print this puzzle online
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Re: May 13, 2014

Postby Leren » Tue May 13, 2014 12:17 am

Code: Select all
*--------------------------------------------------------------*
| 9     78    18     | 13    2     37     | 6     5     4      |
| 147   6     5      | 19   b48    79     |c138   2     13     |
| 14    3     2      | 6     458   58     | 18    9     7      |
|--------------------+--------------------+--------------------|
| 6     2     9      | 35    7     35     | 4     1     8      |
| 8     1     7      | 4     6     2      | 9     3     5      |
| 3     5     4      | 89    1     89     | 2     7     6      |
|--------------------+--------------------+--------------------|
| 5     4     6      | 2     3     1      | 7     8     9      |
| 2     9     18     | 7    a58    6      |d13-5  4     13     |
| 17    78    3      | 58    9     4      | 15    6     2      |
*--------------------------------------------------------------*

H2 Wing: (5=8) r8c5 - r2c5 = (8-3) r2c7 = (3) r8c7 => - 5 r8c7; stte

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Re: May 13, 2014

Postby SteveG48 » Tue May 13, 2014 12:22 am

Code: Select all
 *---------------------------------------------------*
 | 9    78   18   | 13   2    37   |  6    5    4    |
 | 147  6    5    | 19   4-8  79   |a*138  2   *13   |
 | 14   3    2    | 6    458  58   |  18   9    7    |
 *----------------+----------------+-----------------|
 | 6    2    9    | 35   7    35   |  4    1    8    |
 | 8    1    7    | 4    6    2    |  9    3    5    |
 | 3    5    4    | 89   1    89   |  2    7    6    |
 *----------------+----------------+-----------------|
 | 5    4    6    | 2    3    1    |  7    8    9    |
 | 2    9    18   | 7   c58   6    |b*135  4   *13   |
 | 17   78   3    | 58   9    4    |  15   6    2    |
 *---------------------------------------------------*


[(8)r2c7 = (5)r8c7][UR 1/3 r28c79] - (5=8)r8c5 => -8 r2c5 ; stte
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Re: May 13, 2014

Postby Marty R. » Tue May 13, 2014 12:56 am

Something's staring me in the face that I'm not seeing. Doing basics, how'd you get rid of the 8s in r2c46? :oops:
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Re: May 13, 2014

Postby SteveG48 » Tue May 13, 2014 1:50 am

Marty R. wrote:Something's staring me in the face that I'm not seeing. Doing basics, how'd you get rid of the 8s in r2c46? :oops:


Naked triple 4/5/8 B2.
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Re: May 13, 2014

Postby ArkieTech » Tue May 13, 2014 10:53 am

Code: Select all
*--------------------------------------------------*
 | 9    78   18   | 13   2    37   | 6    5    4    |
 | 147  6    5    | 19   48   79   | 138  2    13   |
 | 14   3    2    | 6    458  5-8  |c18   9    7    |
 |----------------+----------------+----------------|
 | 6    2    9    | 35   7    35   | 4    1    8    |
 | 8    1    7    | 4    6    2    | 9    3    5    |
 | 3    5    4    |b89   1   a89   | 2    7    6    |
 |----------------+----------------+----------------|
 | 5    4    6    | 2    3    1    | 7    8    9    |
 | 2    9    18   | 7    58   6    | 135  4    13   |
 | 17   78   3    |b58   9    4    |c15   6    2    |
 *--------------------------------------------------*
(8=9)r6c6-(9=5)r69c4-(5=8)r39c7 => -8r3c6; ste
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Re: May 13, 2014

Postby Marty R. » Tue May 13, 2014 3:09 pm

SteveG48 wrote:
Marty R. wrote:Something's staring me in the face that I'm not seeing. Doing basics, how'd you get rid of the 8s in r2c46? :oops:


Naked triple 4/5/8 B2.


Thanks. Nobody can accuse me of not willing to embarrass myself in public. :lol:
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Re: May 13, 2014

Postby Marty R. » Tue May 13, 2014 3:24 pm

Code: Select all
+-----------+-----------+----------+
| 9   78 18 | 13 2   37 | 6   5 4  |
| 147 6  5  | 19 48  79 | 138 2 13 |
| 14  3  2  | 6  458 58 | 18  9 7  |
+-----------+-----------+----------+
| 6   2  9  | 35 7   35 | 4   1 8  |
| 8   1  7  | 4  6   2  | 9   3 5  |
| 3   5  4  | 89 1   89 | 2   7 6  |
+-----------+-----------+----------+
| 5   4  6  | 2  3   1  | 7   8 9  |
| 2   9  18 | 7  58  6  | 135 4 13 |
| 17  78 3  | 58 9   4  | 15  6 2  |
+-----------+-----------+----------+

Play this puzzle online at the Daily Sudoku site

XY-Wing (18-5) with transport.

(5=8)r3c6-(8=1)r3c7-(1=5)r9c7-r9c4=r8c5=>r3c5<>5
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Re: May 13, 2014

Postby Ngisa » Tue May 13, 2014 6:19 pm

Code: Select all
+-----------+-------------+----------+
| 9   78 18 | 13  2   37  | 6   5 4  |
| 17-4 6  5  | 189 a48  789 | 138 2 13 |
| f14  3  2  | 6   458 58  | 18  9 7  |
+-----------+-------------+----------+
| 6   2  9  | 35  7   35  | 4   1 8  |
| 8   1  7  | 4   6   2   | 9   3 5  |
| 3   5  4  | 89  1   89  | 2   7 6  |
+-----------+-------------+----------+
| 5   4  6  | 2   3   1   | 7   8 9  |
| 2   9  18 | 7   b58  6   | 135 4 13 |
| e17  d78 3  | c58  9   4   | 15  6 2  |
+-----------+-------------+----------+
(4=8)r2c5-(8=5)r8c5-(5=8)r9c4-(8=7)r9c2-(7=1)r9c1-(1=4)r3c1 => -4r2c1; stte.
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Re: May 13, 2014

Postby SteveG48 » Tue May 13, 2014 9:07 pm

Ngisa wrote:
Code: Select all
+-----------+-------------+----------+
| 9   78 18 | 13  2   37  | 6   5 4  |
| 17-4 6  5  | 189 a48  789 | 138 2 13 |
| f14  3  2  | 6   458 58  | 18  9 7  |
+-----------+-------------+----------+
| 6   2  9  | 35  7   35  | 4   1 8  |
| 8   1  7  | 4   6   2   | 9   3 5  |
| 3   5  4  | 89  1   89  | 2   7 6  |
+-----------+-------------+----------+
| 5   4  6  | 2   3   1   | 7   8 9  |
| 2   9  18 | 7   b58  6   | 135 4 13 |
| e17  d78 3  | c58  9   4   | 15  6 2  |
+-----------+-------------+----------+
(4=8)r2c5-(8=5)r8c5-(5=8)r9c4-(8=7)r9c2-(7=1)r9c1-(1=4)r3c1 => -4r2c1; stte.


Nice one, Ngisa. If you like, you can shorten it a bit by eliminating the unnecessary 5's in terms b and c, and by using an ALS to combine terms d and e. Like this:

(4=8)r2c5-r8c5=r9c4-(8=17)r9c12-(1=4)r3c1

Danny made that last point for me just a couple of days ago, where I had a 2 cell ALS that could be expanded to 3 cells. The flag suggesting the possibility is having an element of the set (just 7 in your case) followed by a strong link from that element to one more element in the same house in the next step.
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Re: May 13, 2014

Postby Ngisa » Wed May 14, 2014 3:50 pm

Thanks, Steve.
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