September 6, 2016

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September 6, 2016

Postby ArkieTech » Mon Sep 05, 2016 11:25 pm

Code: Select all
 *-----------*
 |...|..2|.1.|
 |6..|...|48.|
 |1.4|...|..5|
 |---+---+---|
 |2.6|.8.|74.|
 |8..|.7.|..3|
 |.1.|93.|2..|
 |---+---+---|
 |...|..8|.7.|
 |..3|..7|...|
 |97.|...|...|
 *-----------*


Play/Print this puzzle online
Last edited by ArkieTech on Tue Sep 06, 2016 2:04 am, edited 1 time in total.
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Re: September 6, 2016

Postby Leren » Mon Sep 05, 2016 11:29 pm

Code: Select all
*-----------------------------------------------------*
| 3    5    7     | 8    4    2     | 9    1    6     |
| 6    9    2     | 15   15   3     | 4    8    7     |
| 1    8    4     | 7    6    9     | 3    2    5     |
|-----------------+-----------------+-----------------|
| 2    3    6     | 15   8    15    | 7    4    9     |
| 8    4    9     | 2    7    6     | 1    5    3     |
| 7    1    5     | 9    3    4     | 2    6    8     |
|-----------------+-----------------+-----------------|
|a45   26   1     | 3    9    8     |b56   7    2-4   |
| 45   26   3     | 46   125  7     | 8    9    124   |
| 9    7    8     |d46   125  15    |c56   3   e124   |
*-----------------------------------------------------*

(4=5) r7c1 - r7c7 = (5-6) r9c7 = (6-4) r9c4 = (4) r9c9 => - 4 r7c9; stte

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Re: September 6, 2016

Postby SteveG48 » Mon Sep 05, 2016 11:48 pm

Code: Select all
 *--------------------------------------------------*
 | 3    5    7    | 8    4    2    | 9    1    6    |
 | 6    9    2    | 15   15   3    | 4    8    7    |
 | 1    8    4    | 7    6    9    | 3    2    5    |
 *----------------+----------------+----------------|
 | 2    3    6    | 15   8    15   | 7    4    9    |
 | 8    4    9    | 2    7    6    | 1    5    3    |
 | 7    1    5    | 9    3    4    | 2    6    8    |
 *----------------+----------------+----------------|
 | 4-5 a26   1    | 3    9    8    |a56   7    24   |
 |b45  b26   3    |b46   125  7    | 8    9    124  |
 | 9    7    8    | 46   125  15   | 56   3    124  |
 *--------------------------------------------------*


(5=26)r7c27 - (2=456)r8c124 => -5 r7c1 ; stte
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Re: September 6, 2016

Postby Marty R. » Mon Sep 05, 2016 11:57 pm

Dan, clicking the link yields a different grid.
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Re: September 6, 2016

Postby pjb » Tue Sep 06, 2016 12:01 am

This is the sort of puzzle where I think screw the one stepper and do the obvious, ie
BUG-lite (type 1) at r2c45, r4c46, r9c56 => -15 r9c5
BUG+1 pattern => r8c9=4; stte

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Re: September 6, 2016

Postby Marty R. » Tue Sep 06, 2016 2:02 am

Code: Select all
+---------+-----------+----------+
| 3  5  7 | 8  4   2  | 9  1 6   |
| 6  9  2 | 15 15  3  | 4  8 7   |
| 1  8  4 | 7  6   9  | 3  2 5   |
+---------+-----------+----------+
| 2  3  6 | 15 8   15 | 7  4 9   |
| 8  4  9 | 2  7   6  | 1  5 3   |
| 7  1  5 | 9  3   4  | 2  6 8   |
+---------+-----------+----------+
| 45 26 1 | 3  9   8  | 56 7 24  |
| 45 26 3 | 46 125 7  | 8  9 124 |
| 9  7  8 | 46 125 15 | 56 3 124 |
+---------+-----------+----------+

Play this puzzle online at the Daily Sudoku site

(4=5)r7c1-(5=462)r8c142-(2=6)r7c2 contradiction: 3 cells (r7c127) for 2 numbers (56)=> -5r7c1
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Re: September 6, 2016

Postby ArkieTech » Tue Sep 06, 2016 2:05 am

Marty R. wrote:Dan, clicking the link yields a different grid.


I did it again - sorry :oops:
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Re: September 6, 2016

Postby Ngisa » Tue Sep 06, 2016 7:38 am

Code: Select all
+---------+-----------+----------+
| 3  5  7 | 8  4   2  | 9  1 6   |
| 6  9  2 | 15 15  3  | 4  8 7   |
| 1  8  4 | 7  6   9  | 3  2 5   |
+---------+-----------+----------+
| 2  3  6 | 15 8   15 | 7  4 9   |
| 8  4  9 | 2  7   6  | 1  5 3   |
| 7  1  5 | 9  3   4  | 2  6 8   |
+---------+-----------+----------+
| c45 26 1 | 3  9   8  | b56 7 24  |
| d45 26 3 | e46 125 7  | 8  9 124 |
| 9  7  8 | 4-6 125 15 | a56 3 124 |
+---------+-----------+----------+

(6=5)r9c7 -r7c7 = (5-4)r7c1 = r8c1 - (4=6)r8c4 => -6 r9c4; stte

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Re: September 6, 2016

Postby bat999 » Tue Sep 06, 2016 11:11 am

Code: Select all
.--------------.--------------.--------------.
|  3    5    7 |  8   4    2  | 9   1   6    |
|  6    9    2 |  15  15   3  | 4   8   7    |
|  1    8    4 |  7   6    9  | 3   2   5    |
:--------------+--------------+--------------:
|  2    3    6 |  15  8    15 | 7   4   9    |
|  8    4    9 |  2   7    6  | 1   5   3    |
|  7    1    5 |  9   3    4  | 2   6   8    |
:--------------+--------------+--------------:
| a45   6-2  1 |  3   9    8  | 56  7  a24   |
| b45  b26   3 | b46  125  7  | 8   9   14-2 |
|  9    7    8 |  46  125  15 | 56  3   124  |
'--------------'--------------'--------------'
(2=5)r7c19 - (5=2)r8c124 => -2 r7c2,r8c9; stte
8-)
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Re: September 6, 2016

Postby Sudtyro2 » Tue Sep 06, 2016 9:17 pm

1r8c9 is also an stte elimination. Can anyone supply the chain(s) or network?

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Re: September 6, 2016

Postby SteveG48 » Tue Sep 06, 2016 11:45 pm

Sudtyro2 wrote:1r8c9 is also an stte elimination. Can anyone supply the chain(s) or network?

SteveC


-1 r9c9 => 2/4/6 r78c2,r89c4,r79c9. This pattern has no solution, so r9c9=1.

More formally,

1r9c9 = [[4r9c9 = r9c4 - (4=6)r8c4 - r8c2 = (6-2)r7c2 = r7c9] - [2r9c9 = 4r9c9 - (4=6)r9c4 - r8c4 = r8c2 - (6=2)r7c2 - (2=4)r7c9]] => -24 r9c9
Last edited by SteveG48 on Tue Sep 06, 2016 11:59 pm, edited 1 time in total.
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Re: September 6, 2016

Postby Leren » Tue Sep 06, 2016 11:51 pm

The full list of single candidate elimination stte opportunities for this puzzle is : 5 r2c4, 1 r2c5, 1 r4c4, 5 r4c6, 5 r7c1, 2 r7c2, 6 r7c7, 4 r7c9, 4 r8c1, 6 r8c2, 4 r8c4, 5 r8c5, 1 r8c9, 6 r9c4, 1 r9c6, 5 r9c7 & 4 r9c9

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Re: September 6, 2016

Postby Sudtyro2 » Wed Sep 07, 2016 12:46 am

Special thanks to Steve and Leren for the helpful feedback!
Still much to learn in this tyro stage!
I like to pick a stte candidate that's not part of a linked cluster, but 1r8c9 was too tough for my Medusa coloring scheme.

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