March 21, 2014

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March 21, 2014

Postby ArkieTech » Thu Mar 20, 2014 8:04 pm

Code: Select all
 *-----------*
 |.6.|.2.|1.8|
 |2.9|...|4..|
 |...|...|2.6|
 |---+---+---|
 |...|.71|.4.|
 |5..|2.8|..1|
 |.3.|96.|...|
 |---+---+---|
 |9.8|...|...|
 |..4|...|5.2|
 |3.6|.5.|.8.|
 *-----------*


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Re: March 21, 2014

Postby Leren » Thu Mar 20, 2014 10:11 pm

Code: Select all
*--------------------------------------------------------------*
| 47    6     35     | 3457  2     34579  | 1     579   8      |
| 2     178   9      | 5678  18    567    | 4     57    3      |
| 1478  1478  35     | 34578 189   34579  | 2     579   6      |
|--------------------+--------------------+--------------------|
| 6     89    2      |a35    7     1      | 89-3  4    b59     |
| 5     49    7      | 2     4-3   8      |c369  c36    1      |
| 48    3     1      | 9     6     45     | 78    2     57     |
|--------------------+--------------------+--------------------|
| 9     5     8      | 3467  34    2      | 36    1     47     |
| 17    17    4      | 368   89    369    | 5     36    2      |
| 3     2     6      | 1     5     47     | 79    8     479    |
*--------------------------------------------------------------*

The early bird catches the worm !

(3=5) r4c4 - (5=9) r4c9 - (9=36) r5c78 => - 3 r4c7, r5c5; stte

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Re: March 21, 2014

Postby SteveG48 » Fri Mar 21, 2014 12:40 am

Code: Select all
 *--------------------------------------------------------------------*
 | 47     6      35     | 3457   2      34579  | 1      579    8      |
 | 2      178    9      | 5678   18     567    | 4      57     3      |
 | 1478   1478   35     | 34578  189    34579  | 2      579    6      |
 *----------------------+----------------------+----------------------|
 | 6     a89     2      | 35     7      1      |a389    4      5-9    |
 | 5      49     7      | 2      34     8      |b369   b36     1      |
 | 48     3      1      | 9      6      45     | 78     2      57     |
 *----------------------+----------------------+----------------------|
 | 9      5      8      | 3467   34     2      | 36     1      47     |
 | 17     17     4      | 368    89     369    | 5      36     2      |
 | 3      2      6      | 1      5      47     | 79     8      479    |
 *--------------------------------------------------------------------*


Variation on a theme:

(9=38)r4c27 - (3=69)r5c78 => -9 r4c9 ; stte
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Re: March 21, 2014

Postby Ngisa » Fri Mar 21, 2014 10:37 am

Code: Select all
+--------------+-----------------+--------------+
| 47   6    35 | 3457  2   34579 | 1   579 8  |
| 2    178  9  | 5678  18  567   | 4   57  3   |
| 1478 1478 35 | 34578 189 34579 | 2   579 6   |
+--------------+-----------------+-------------+
| 6    b89   2  | 35    7   1     | 389 4   a59  |
| 5    c49   7  | 2     d34  8     | 369 36  1   |
| 48   3    1  | 9     6   e45    | 78  2   7-5  |
+--------------+-----------------+-------------+
| 9    5    8  | 3467  34  2     | 367 1   47  |
| 17   17   4  | 368   89  369   | 5   36  2   |
| 3    2    6  | 1     5   479   | 79  8   479 |
+--------------+-----------------+-------------+
(5=9)r4c9-(9=8)r4c2-r5c2=(4)r5c5-(4=5)r6c6 =>-5r6c9; stte.
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Re: March 21, 2014

Postby Marty R. » Fri Mar 21, 2014 4:03 pm

Code: Select all
+--------------+-----------------+-------------+
| 47   6    35 | 3457  2   34579 | 1   579 8   |
| 2    178  9  | 5678  18  567   | 4   57  3   |
| 1478 1478 35 | 34578 189 34579 | 2   579 6   |
+--------------+-----------------+-------------+
| 6    89   2  | 35    7   1     | 389 4   59  |
| 5    49   7  | 2     34  8     | 369 36  1   |
| 48   3    1  | 9     6   45    | 78  2   57  |
+--------------+-----------------+-------------+
| 9    5    8  | 3467  34  2     | 36  1   47  |
| 17   17   4  | 368   89  369   | 5   36  2   |
| 3    2    6  | 1     5   47    | 79  8   479 |
+--------------+-----------------+-------------+

Play this puzzle online at the Daily Sudoku site

XY-Chain: (9=7)r9c7-(7=8)r6c7-(8=4)r6c1-(4=9)r5c2=>r5c7<>9
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Re: March 21, 2014

Postby Marty R. » Fri Mar 21, 2014 5:43 pm

Ngisa wrote:
Code: Select all
+--------------+-----------------+--------------+
| 47   6    35 | 3457  2   34579 | 1   579 8  |
| 2    178  9  | 5678  18  567   | 4   57  3   |
| 1478 1478 35 | 34578 189 34579 | 2   579 6   |
+--------------+-----------------+-------------+
| 6    b89   2  | 35    7   1     | 389 4   a59  |
| 5    c49   7  | 2     d34  8     | 369 36  1   |
| 48   3    1  | 9     6   e45    | 78  2   7-5  |
+--------------+-----------------+-------------+
| 9    5    8  | 3467  34  2     | 367 1   47  |
| 17   17   4  | 368   89  369   | 5   36  2   |
| 3    2    6  | 1     5   479   | 79  8   479 |
+--------------+-----------------+-------------+
(5=9)r4c9-(9=8)r4c2-r5c2=(4)r5c5-(4=5)r6c6 =>-5r6c9; stte.


Ngisa,

I'm not understanding the 3rd term. I was expecting the -r5c2 to refer to the previous number (8), but there's no 8 in r5c2 so I'm confused.
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Re: March 21, 2014

Postby SteveG48 » Fri Mar 21, 2014 11:08 pm

Marty R. wrote:
Ngisa wrote:
Code: Select all
+--------------+-----------------+--------------+
| 47   6    35 | 3457  2   34579 | 1   579 8  |
| 2    178  9  | 5678  18  567   | 4   57  3   |
| 1478 1478 35 | 34578 189 34579 | 2   579 6   |
+--------------+-----------------+-------------+
| 6    b89   2  | 35    7   1     | 389 4   a59  |
| 5    c49   7  | 2     d34  8     | 369 36  1   |
| 48   3    1  | 9     6   e45    | 78  2   7-5  |
+--------------+-----------------+-------------+
| 9    5    8  | 3467  34  2     | 367 1   47  |
| 17   17   4  | 368   89  369   | 5   36  2   |
| 3    2    6  | 1     5   479   | 79  8   479 |
+--------------+-----------------+-------------+
(5=9)r4c9-(9=8)r4c2-r5c2=(4)r5c5-(4=5)r6c6 =>-5r6c9; stte.


Ngisa,

I'm not understanding the 3rd term. I was expecting the -r5c2 to refer to the previous number (8), but there's no 8 in r5c2 so I'm confused.


I think he meant - (9)r4c2 = (9-4)r5c2 ....
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Re: March 21, 2014

Postby Ngisa » Sat Mar 22, 2014 7:53 am

Marty/Steve,
If 9 is in r4c9 it cannot be in r4c2, 8 remains in r2c4. There are only two 9's in col 2 so, 9 must go in r5c2 pushing 4 to r5c5 leaving 5 in r6c6, so the elimination of 5 inr6c9, is it clear?
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Re: March 21, 2014

Postby SteveG48 » Sat Mar 22, 2014 2:06 pm

Ngisa wrote:Marty/Steve,
If 9 is in r4c9 it cannot be in r4c2, 8 remains in r2c4. There are only two 9's in col 2 so, 9 must go in r5c2 pushing 4 to r5c5 leaving 5 in r6c6, so the elimination of 5 inr6c9, is it clear?


Ngisa, your solution is clear and valid. It's the notation that's confusing. You wrote:

(5=9)r4c9-(9=8)r4c2-r5c2=(4)r5c5-(4=5)r6c6 =>-5r6c9

The fact that 8 remains in r4c2 is irrelevant to the solution and doesn't contribute to the following term. I think you meant to write:

(5=9)r4c9-(9)r4c2 = (9-4)r5c2=(4)r5c5-(4=5)r6c6 =>-5r6c9
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