Dan's Debacle October 30, 2013

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Dan's Debacle October 30, 2013

Postby ArkieTech » Wed Oct 30, 2013 1:45 am

Code: Select all
 *-----------*
 |...|..4|..2|
 |.1.|.8.|9..|
 |9..|6.2|1..|
 |---+---+---|
 |..1|4..|8..|
 |23.|...|.79|
 |..9|..3|6..|
 |---+---+---|
 |..8|9.6|..4|
 |..5|.4.|.6.|
 |1..|2..|...|
 *-----------*


Play/Print this puzzle online
dan
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Re: Dan's Debacle October 30, 2013

Postby Leren » Wed Oct 30, 2013 5:47 am

Code: Select all
*--------------------------------------------------------------*
| 6     5     37     | 1     9     4      |a37    8     2      |
| 4     1     2      | 35    8     7      | 9    b35    6      |
| 9     8     37     | 6     35    2      | 1     4     5-7    |
|--------------------+--------------------+--------------------|
| 5     7     1      | 4     6     9      | 8     2     3      |
| 2     3     6      | 58    15    158    | 4     7     9      |
| 8     4     9      | 7     2     3      | 6     15    15     |
|--------------------+--------------------+--------------------|
|d37    2     8      | 9     1357  6      | 35-7 c13    4      |
|e37    9     5      | 38    4     18     | 2     6    f178    |
| 1     6     4      | 2     357   58     | 35-7  9     78     |
*--------------------------------------------------------------*

W Wing (37) with pincer transport: (7=3) r1c7 - r2c8 = r7c8 - (3=7) r7c1 - r8c1 = (7) r8c9 => - 7 r3c9, r79c7; stte

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Re: Dan's Debacle October 30, 2013

Postby pjb » Wed Oct 30, 2013 6:01 am

Code: Select all
 6      5      37    | 1      9      4      | 37     8      2     
 4      1      2     | 35     8      7      | 9      35     6     
 9      8      37    | 6      35     2      | 1      4      57     
 --------------------+----------------------+---------------------
 5      7      1     | 4      6      9      | 8      2      3     
 2      3      6     | 58     15     158    | 4      7      9     
 8      4      9     | 7      2      3      | 6      15     15     
 --------------------+----------------------+---------------------
a37     2      8     | 9     b1357   6      | 57-3   1-3    4     
 37     9      5     | 38     4      18     | 2      6      178   
 1      6      4     | 2     c357    58     | d357    9      78     

(3=7) r7c1 - r7c5 = (7-3) r9c5 = r9c7 => -3 r7c78; stte

Phil
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Re: Dan's Debacle October 30, 2013

Postby tlanglet » Wed Oct 30, 2013 12:56 pm

Code: Select all
 *-----------------------------------------------------------*
 | 6     5     37    | 1     9     4     | 37    8     2     |
 | 4     1     2     | 35    8     7     | 9     35    6     |
 | 9     8     37    | 6     35    2     | 1     4     57    |
 |-------------------+-------------------+-------------------|
 | 5     7     1     | 4     6     9     | 8     2     3     |
 | 2     3     6     | 58    15    158   | 4     7     9     |
 | 8     4     9     | 7     2     3     | 6     15    15    |
 |-------------------+-------------------+-------------------|
 | 37    2     8     | 9     1357  6     | 357   13    4     |
 | 37    9     5     |*38    4     18    | 2     6     178   |
 | 1     6     4     | 2     57-3 *58    |*357   9     78    |
 *-----------------------------------------------------------*

AXY-wing(58-3) with (58)r9c6, (38)r8c4 & (35=7)r9c7
1: xy-wing(58-3) => r9c5<>3
2: 7r9c7-(7=81)r98c9-(1=83)r8c64 => r9c5<>3

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Re: Dan's Debacle October 30, 2013

Postby Marty R. » Wed Oct 30, 2013 4:49 pm

Code: Select all
+---------+-------------+------------+
| 6  5 37 | 1  9    4   | 37  8  2   |
| 4  1 2  | 35 8    7   | 9   35 6   |
| 9  8 37 | 6  35   2   | 1   4  57  |
+---------+-------------+------------+
| 5  7 1  | 4  6    9   | 8   2  3   |
| 2  3 6  | 58 15   158 | 4   7  9   |
| 8  4 9  | 7  2    3   | 6   15 15  |
+---------+-------------+------------+
| 37 2 8  | 9  1357 6   | 357 13 4   |
| 37 9 5  | 38 4    18  | 2   6  178 |
| 1  6 4  | 2  357  58  | 357 9  78  |
+---------+-------------+------------+

Play this puzzle online at the Daily Sudoku site

(8=3)r8c4-r2c4=r2c8-(3=1)r7c8-r7c5=1r8c6=>r8c6=1

Does this loop have a name?
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Re: Dan's Debacle October 30, 2013

Postby Sudtyro2 » Wed Oct 30, 2013 8:54 pm

Marty R. wrote:
Code: Select all
+---------+-------------+------------+
| 6  5 37 | 1  9    4   | 37  8  2   |
| 4  1 2  | 35 8    7   | 9   35 6   |
| 9  8 37 | 6  35   2   | 1   4  57  |
+---------+-------------+------------+
| 5  7 1  | 4  6    9   | 8   2  3   |
| 2  3 6  | 58 15   158 | 4   7  9   |
| 8  4 9  | 7  2    3   | 6   15 15  |
+---------+-------------+------------+
| 37 2 8  | 9  1357 6   | 357 13 4   |
| 37 9 5  | 38 4    18  | 2   6  178 |
| 1  6 4  | 2  357  58  | 357 9  78  |
+---------+-------------+------------+

(8=3)r8c4-r2c4=r2c8-(3=1)r7c8-r7c5=1r8c6=>r8c6=1
Does this loop have a name?

In conventional Eureka notation, it would be a simple AIC (Alternating Inference Chain):
(8=3)r8c4-(3)r2c4=(3)r2c8-(3=1)r7c8-(1)r7c5=(1)r8c6 => r8c6<>8
It's not actually a loop, unless you include the two implied weak links [to (8)r8c6] at each end of the chain.
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Re: Dan's Debacle October 30, 2013

Postby Marty R. » Wed Oct 30, 2013 9:29 pm

In conventional Eureka notation, it would be a simple AIC (Alternating Inference Chain):
(8=3)r8c4-(3)r2c4=(3)r2c8-(3=1)r7c8-(1)r7c5=(1)r8c6 => r8c6<>8
It's not actually a loop, unless you include the two implied weak links [to (8)r8c6] at each end of the chain.


Thanks. I was under the impression that any chain that started and ended in the same house was a loop.
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Re: Dan's Debacle October 30, 2013

Postby pjb » Wed Oct 30, 2013 10:20 pm

I might be a bit old fashioned, but to me this is a discontinuous nice loop:
8 (r8c6) - (8=3) r8c4 - r2c4 = r2c8 - (3=1) r7c8 - r7c5 = r8c6 => -8 r8c6
Phil
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Re: Dan's Debacle October 30, 2013

Postby Luke » Wed Oct 30, 2013 10:33 pm

pjb wrote:I might be a bit old fashioned, but to me this is a discontinuous nice loop:
8 (r8c6) - (8=3) r8c4 - r2c4 = r2c8 - (3=1) r7c8 - r7c5 = r8c6 => -8 r8c6
Phil

To be authentically old-fashioned you'd have to use nice-loop notation ... :)

Marty, if you added both (35) cells in that top band, I believe the proper name for the move would be
"XY-Chain That Threw In The Towel In The Last Node."
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