September 9, 2016

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September 9, 2016

Postby ArkieTech » Thu Sep 08, 2016 10:59 pm

Code: Select all
 *-----------*
 |...|2.6|.4.|
 |..5|...|..8|
 |9.2|.5.|.3.|
 |---+---+---|
 |...|.74|..3|
 |.2.|6.1|.8.|
 |3..|58.|...|
 |---+---+---|
 |.8.|.2.|1.9|
 |4..|...|8..|
 |.5.|7.8|...|
 *-----------*


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dan
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Re: September 9, 2016

Postby SteveG48 » Thu Sep 08, 2016 11:33 pm

Code: Select all
 *-----------------------------------------------------------*
 | 178   137   1378  | 2     19    6     | 579   4    c57    |
 |a167   167   5     |b13    4    b39    |b279  b29    8     |
 | 9     4     2     | 8     5     7     | 6     3     1     |
 *-------------------+-------------------+-------------------|
 | 1568  16    168   | 9     7     4     | 25    12    3     |
 |a57    2     49    | 6     3     1     | 49    8     7-5   |
 | 3     179   1479  | 5     8     2     | 479   19    6     |
 *-------------------+-------------------+-------------------|
 |a67    8     367   | 4     2     35    | 1     57    9     |
 | 4     1379  1379  | 13    6     359   | 8     57    2     |
 | 2     5     19    | 7     19    8     | 3     6     4     |
 *-----------------------------------------------------------*


(5=167)r257c1 - (1=2379)r2c4678 - (7=5)r1c9 => -5 r5c9 ; stte
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Re: September 9, 2016

Postby pjb » Fri Sep 09, 2016 12:13 am

Code: Select all
 178     137     1378   | 2     a19     6      |b57-9   4      57     
 167     167     5      | 13     4      3-9    |d279   e29     8     
 9       4       2      | 8      5      7      | 6      3      1     
------------------------+----------------------+---------------------
 1568    16      168    | 9      7      4      | 25    c12     3     
 57      2       49     | 6      3      1      | 49     8      57     
 3       179     1479   | 5      8      2      | 479    19     6     
------------------------+----------------------+---------------------
 67      8       367    | 4      2      35     | 1      57     9     
 4       1379    1379   | 13     6      359    | 8      57     2     
 2       5       19     | 7      19     8      | 3      6      4     

(9)r1c5 = (9-5)r1c7 = (5-2)r4c7 = r2c7 - (2=9)r2c8 => -9 r1c7, r2c6; stte

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Re: September 9, 2016

Postby Marty R. » Fri Sep 09, 2016 1:02 am

Code: Select all
+----------------+-----------+-----------+
| 178  137  1378 | 2  19 6   | 579 4  57 |
| 167  167  5    | 13 4  39  | 279 29 8  |
| 9    4    2    | 8  5  7   | 6   3  1  |
+----------------+-----------+-----------+
| 1568 16   168  | 9  7  4   | 25  12 3  |
| 57   2    49   | 6  3  1   | 49  8  57 |
| 3    179  1479 | 5  8  2   | 479 19 6  |
+----------------+-----------+-----------+
| 67   8    367  | 4  2  35  | 1   57 9  |
| 4    1379 1379 | 13 6  359 | 8   57 2  |
| 2    5    19   | 7  19 8   | 3   6  4  |
+----------------+-----------+-----------+

Play this puzzle online at the Daily Sudoku site

DP (49)r56c37 using externals

9r6c2=9r6c8
9r6c2-r6c8=r2c8-(9=3)r2c6
9r6c8-(9=47)r56c7-(47=29)r256c7-(9=3)r2c6=> 3r2c6
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Re: September 9, 2016

Postby SteveG48 » Fri Sep 09, 2016 1:39 am

Marty R. wrote:
Code: Select all
+----------------+-----------+-----------+
| 178  137  1378 | 2  19 6   | 579 4  57 |
| 167  167  5    | 13 4  39  | 279 29 8  |
| 9    4    2    | 8  5  7   | 6   3  1  |
+----------------+-----------+-----------+
| 1568 16   168  | 9  7  4   | 25  12 3  |
| 57   2    49   | 6  3  1   | 49  8  57 |
| 3    179  1479 | 5  8  2   | 479 19 6  |
+----------------+-----------+-----------+
| 67   8    367  | 4  2  35  | 1   57 9  |
| 4    1379 1379 | 13 6  359 | 8   57 2  |
| 2    5    19   | 7  19 8   | 3   6  4  |
+----------------+-----------+-----------+

Play this puzzle online at the Daily Sudoku site

DP (49)r56c37 using externals

9r6c2=9r6c8
9r6c2-r6c8=r2c8-(9=3)r2c6
9r6c8-(9=47)r56c7-(47=29)r256c7-(9=3)r2c6=> 3r2c6


Marty, I don't follow the part in red. You seem to be using the presence of 4 and 7 in r56c7 to eliminate them in the same cells, and then going ....?

However, how about this:

9r6c8-(9=457)r56c7,r5c9 -(5|7=29)r24c7-(9=3)r2c6=> 3r2c6
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Re: September 9, 2016

Postby Leren » Fri Sep 09, 2016 5:53 am

Code: Select all
*--------------------------------------------------------------*
| 178   137   1378   | 2     19    6      |d57-9  4     57     |
| 167   167   5      | 13    4     39     |b279  a29    8      |
| 9     4     2      | 8     5     7      | 6     3     1      |
|--------------------+--------------------+--------------------|
| 1568  16    168    | 9     7     4      |c25    12    3      |
| 57    2     49     | 6     3     1      | 49    8     57     |
| 3     179   1479   | 5     8     2      | 479   19    6      |
|--------------------+--------------------+--------------------|
| 67    8     367    | 4     2     35     | 1     57    9      |
| 4     1379  1379   | 13    6     359    | 8     57    2      |
| 2     5     19     | 7     19    8      | 3     6     4      |
*--------------------------------------------------------------*

H2 Wing: (9=2) r2c8 - r2c7 = (2-5) r4c7 = (5) r1c7 => - 9 r1c7; stte

Today's stte list was a record - 31 locations:

8 r1c1, 1 r1c5, 5 r1c7, 9 r1c7, 7 r1c9, 6 r2c1, 3 r2c4, 9 r2c6, 2 r2c8, 5 r4c1, 6 r4c2, 8 r4c3, 2 r4c7, 1 r4c8, 7 r5c1, 9 r5c3, 4 r5c7, 5 r5c9, 4 r6c3, 9 r6c8, 7 r7c1, 6 r7c3, 3 r7c6, 5 r7c8, 9 r8c2, 1 r8c4, 5 r8c6, 7 r8c8, 1 r9c3 & 9 r9c5

No doubt Steve will provide a solution for each one ! :D

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Re: September 9, 2016

Postby Ngisa » Fri Sep 09, 2016 10:05 am

Code: Select all
+----------------+-----------+-----------+
| 178  137  1378 | 2  19 6   | 579 4  57 |
| 167  167  5    | 13 4  39  | 279 29 8  |
| 9    4    2    | 8  5  7   | 6   3  1  |
+----------------+-----------+-----------+
| e1568 16   d168  | 9  7  4   | 25  12 3  |
| af5-7   2    49   | 6  3  1   | 49  8  57 |
| 3    179  1479 | 5  8  2   | 479 19 6  |
+----------------+-----------+-----------+
| b67   8    c367  | 4  2  35  | 1   57 9  |
| 4    1379 1379 | 13 6  359 | 8   57 2  |
| 2    5    19   | 7  19 8   | 3   6  4  |
+----------------+-----------+-----------+

7r5c1 - (7=6)r7c1 - r7c3 = (6-8)r4c3 = (8-5)r4c1 = (5)r5c1 => -7 r5c1; stte

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Re: September 9, 2016

Postby Marty R. » Fri Sep 09, 2016 1:04 pm

SteveG48 wrote:
Marty R. wrote:
Code: Select all
+----------------+-----------+-----------+
| 178  137  1378 | 2  19 6   | 579 4  57 |
| 167  167  5    | 13 4  39  | 279 29 8  |
| 9    4    2    | 8  5  7   | 6   3  1  |
+----------------+-----------+-----------+
| 1568 16   168  | 9  7  4   | 25  12 3  |
| 57   2    49   | 6  3  1   | 49  8  57 |
| 3    179  1479 | 5  8  2   | 479 19 6  |
+----------------+-----------+-----------+
| 67   8    367  | 4  2  35  | 1   57 9  |
| 4    1379 1379 | 13 6  359 | 8   57 2  |
| 2    5    19   | 7  19 8   | 3   6  4  |
+----------------+-----------+-----------+

Play this puzzle online at the Daily Sudoku site

DP (49)r56c37 using externals

9r6c2=9r6c8
9r6c2-r6c8=r2c8-(9=3)r2c6
9r6c8-(9=47)r56c7-(47=29)r256c7-(9=3)r2c6=> 3r2c6


Marty, I don't follow the part in red. You seem to be using the presence of 4 and 7 in r56c7 to eliminate them in the same cells, and then going ....?

However, how about this:

9r6c8-(9=457)r56c7,r5c9 -(5|7=29)r24c7-(9=3)r2c6=> 3r2c6


OK Steve, the term in red was my invented albeit invalid ALS because I didn't know how to notate what I had plotted out on blank grids. In separate chains the 9 yields 7 in r6c7 and a 2 in r2c8 and those two "pince" on r2c7, leaving a 9.

However, I don't understand your 2nd term. First thing is I see four numbers in two cells. And I don't understand 5|7.

Now I see what I could've done (if legal). My 2nd term could've been (7=29)r2c79, meaning that the 7 in r6c7 causes a 29 pair in r2c78.

Thanks, as always, for keeping me honest. :mrgreen:
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Re: September 9, 2016

Postby SteveG48 » Fri Sep 09, 2016 2:05 pm

Marty R. wrote:
SteveG48 wrote:
Marty R. wrote:[code]
Now I see what I could've done (if legal). My 2nd term could've been (7=29)r2c79, meaning that the 7 in r6c7 causes a 29 pair in r2c78.

Thanks, as always, for keeping me honest. :mrgreen:


Excellent, Marty. Your new observation is right on. I won't bother to explain mine, because it was unnecessarily complicated and yours is not.

The notation 5|7 simply means 5 OR 7, as opposed to 5 AND 7. We frequently use notation like 57 to mean either "5 or 7" (5|7) or to mean "5 and 7" (5&7). I think this is bad practice, because sometimes the distinction is important. On the other hand, using 57 to mean the same as "5 and 7" is pretty common everywhere, so I'm trying to discipline myself to always use 5|7 when appropriate, while accepting the shorthand for the "and" function.
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Re: September 9, 2016

Postby Sudtyro2 » Fri Sep 09, 2016 3:42 pm

Code: Select all
                                           | c7 cover
 *-----------------------------------------------------------*
 | 178   137   1378  | 2     19    6     |p579   4     57    |
 |#167b #167a  5     | 13    4     39    |*279   29    8     |- r2 base
 | 9     4     2     | 8     5     7     | 6     3     1     |
 |-------------------+-------------------+-------------------|
 | 1568  16    168   | 9     7     4     | 25    12    3     |
 | 57d   2     49    | 6     3     1     | 49    8     57e   |
 | 3     179   1479  | 5     8     2     | 49-7f 19    6     |
 |-------------------+-------------------+-------------------|
 | 67c   8     367   | 4     2     35    | 1     57    9     |
 | 4     1379  1379  | 13    6     359   | 8     57    2     |
 | 2     5     19    | 7     19    8     | 3     6     4     |
 *-----------------------------------------------------------*

7s finned Kraken 1x1 Fish r2\c7 + rfr2c12:
# Remote fin
* Covered base cell
p Potential elimination
- Eventual elimination
Code: Select all
Remote Fins:
(7-6)r2c2 = r2c1 - (6=7)r7c1 - r5c1 = 7r5c9 - 7r6c7; stte
                             /
7r1c2 -----------------------

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Re: September 9, 2016

Postby ArkieTech » Fri Sep 09, 2016 5:12 pm

Sudtyro2 wrote:
Code: Select all
                                           | c7 cover
 *-----------------------------------------------------------*
 | 178   137   1378  | 2     19    6     |p579   4     57    |
 |#167b #167a  5     | 13    4     39    |*279   29    8     |- r2 base
 | 9     4     2     | 8     5     7     | 6     3     1     |
 |-------------------+-------------------+-------------------|
 | 1568  16    168   | 9     7     4     | 25    12    3     |
 | 57d   2     49    | 6     3     1     | 49    8     57e   |
 | 3     179   1479  | 5     8     2     | 49-7f 19    6     |
 |-------------------+-------------------+-------------------|
 | 67c   8     367   | 4     2     35    | 1     57    9     |
 | 4     1379  1379  | 13    6     359   | 8     57    2     |
 | 2     5     19    | 7     19    8     | 3     6     4     |
 *-----------------------------------------------------------*

7s finned Kraken 1x1 Fish r2\c7 + rfr2c12:
# Remote fin
* Covered base cell
p Potential elimination
- Eventual elimination
Code: Select all
Remote Fins:
(7-6)r2c2 = r2c1 - (6=7)r7c1 - r5c1 = 7r5c9 - 7r6c7; stte
                             /
7r1c2 -----------------------

SteveC


Why not?

[xw:7r12c1237]-7r6c7
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Re: September 9, 2016

Postby Sudtyro2 » Fri Sep 09, 2016 8:09 pm

ArkieTech wrote:
Why not?
[xw:7r12c1237]-7r6c7

Dan,
My 1x1 Fish above is a by-product of a 5-link Oddagon in 7s giving the same elimination. The smaller fish tend to have remote fins to deal with, but I like the challenge.

I assume your "xw" refers to a (finned?) X-Wing (2x2 Fish), but I'm rusty on anything beyond 1x1. Could you elaborate with a diagram?

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Re: September 9, 2016

Postby ArkieTech » Sat Sep 10, 2016 2:31 am

Sudtyro2 wrote:
ArkieTech wrote:
Why not?
[xw:7r12c1237]-7r6c7

Dan,
My 1x1 Fish above is a by-product of a 5-link Oddagon in 7s giving the same elimination. The smaller fish tend to have remote fins to deal with, but I like the challenge.

I assume your "xw" refers to a (finned?) X-Wing (2x2 Fish), but I'm rusty on anything beyond 1x1. Could you elaborate with a diagram?

SteveC


Sorry the more ways I try the more road blocks I find you are right about the challenge. My first thoughts are totally in error.

:?
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