Steve Stumble 2/26/2021

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Steve Stumble 2/26/2021

Postby SteveG48 » Fri Feb 26, 2021 1:47 pm

Code: Select all
 *-----------*
 |.7.|8.3|2..|
 |1..|25.|..7|
 |...|...|...|
 |---+---+---|
 |3..|.9.|..1|
 |.49|.3.|56.|
 |6..|.7.|..3|
 |---+---+---|
 |...|...|...|
 |5..|.86|..9|
 |..6|9.5|.4.|
 *-----------*
Steve
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Re: Steve Stumble 2/26/2021

Postby Hajime » Fri Feb 26, 2021 4:41 pm

Hidden Text: Show
Code: Select all
Eliminated candidates per Method and per Sudoku

Method   \  Sudoku |   SER |     1
                   |-------|------
Not counted elims  |     0 |    84
Naked Singles      |   0.1 |    22
Hidden Singles     |   0.2 |    81
Naked Pair    [2]  |     3 |     2
Locked Singles[2]  |   2.8 |     3
Turbot-fish   [4]  |   4.2 |     1
XY-Wing       [3]  |   4.1 |     1
XY-chain      [4]  |   4.6 |     2
                   |-------|------
Eliminated Cand's  |   196 |   196
Sum(SER * Cand's)  |  50.3 |  50.3

Initial Candidates :   196
Maximum SER rating :   4.6 <- Approach
Labour rating      :  50.3 <- Experimental rating
Time needed        : 00:00:00.961

1x TurbotCrane length=4, 1x XY-wing length=3 and 1x XYchain length=4 that eliminates 2 candidates.
Solution:
975863214164259387283741695352698471749132568618574923491327856527486139836915742
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Re: Steve Stumble 2/26/2021

Postby jco » Fri Feb 26, 2021 6:33 pm

Hello,

After basics


Code: Select all
  1   2    3     4  5   6     7    8    9
.--------------+------------+---------------.
| 9   7    5   | 8  46  3   | 2    1    46  | 1
| 1   6-8  4   | 2  5   9   | 368 a38   7   | 2
| 28  268  3   | 7  46  1   | 689  589  456 | 3
|--------------+------------+---------------|
| 3   5    28  | 6  9   248 | 48   7    1   | 4
| 7   4    9   | 1  3   28  | 5    6    28  | 5
| 6  c18   128 | 5  7   248 | 489  29-8 3   | 6
|--------------+------------+---------------|
| 4   9    18  | 3  2   7   | 168  5-8  56  | 7
| 5  c12   7   | 4  8   6   | 13  b23   9   | 8
| 28  3    6   | 9  1   5   | 7    4   b28  | 9
'--------------+------------+---------------'


(8=3)r2c8-(3=82)b9p59*-(2=18)r68c2 => -8*r7c8,-8 r2c2,-8 r6c8; ste

Regards,
jco
Last edited by jco on Fri Feb 26, 2021 10:24 pm, edited 1 time in total.
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Re: Steve Stumble 2/26/2021

Postby SteveG48 » Fri Feb 26, 2021 7:41 pm

Very nice, JCO. A chain within a chain, and all three eliminations necessary for the ste result.
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Re: Steve Stumble 2/26/2021

Postby Cenoman » Fri Feb 26, 2021 9:48 pm

jco wrote:(8=3)r2c8-(3=82)b9p59*-(2=18)r68c2 => -8*r7c8,-8 r2c2,-8 r6c8; ste

SteveG48 wrote:Very nice, JCO. A chain within a chain, and all three eliminations necessary for the ste result.

Agreed ! :D
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Re: Steve Stumble 2/26/2021

Postby pjb » Fri Feb 26, 2021 10:46 pm

Code: Select all
 9       7       5      | 8      46     3      | 2      1      46     
 1       68      4      | 2      5      9      | 368   d38     7     
 2-8     268     3      | 7      46     1      | 689   e589    456   
------------------------+----------------------+---------------------
 3       5       28     | 6      9      248    | 48     7      1     
 7       4       9      | 1      3      28     | 5      6      28     
 6       18      128    | 5      7      248    | 49     29     3     
------------------------+----------------------+---------------------
 4       9       18     | 3      2      7      | 168    58     56     
 5       12      7      | 4      8      6      | 13    c23     9     
a28      3       6      | 9      1      5      | 7      4     b28     

(8)r9c1 = (8*-2)r9c9 = (2-3)r8c8 = (3-8)r2*7c8 = (8)r3c8 => -8 r3c1; stte

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Re: Steve Stumble 2/26/2021

Postby jco » Sat Feb 27, 2021 1:12 am

Hello SteveG48,

SteveG48 wrote:Very nice, JCO. A chain within a chain, and all three eliminations necessary for the ste result.


I really enjoyed solving this puzzle. It is a nice puzzle for Medusa coloring.
I used two pair of opposite colors (',"), (`,``), as follows.

Code: Select all
  1     2   3     4  5   6     7     8      9
.---------------+------------+------------------.
| 9    7    5   | 8  46  3   | 2     1      46  | 1
| 1    68!  4   | 2  5   9   |'368  "3'8    7   | 2
|'2"8 "268  3   | 7  46  1   | 689 ``589    4`56| 3
|---------------+------------+------------------|
| 3    5    28  | 6  9   248 | 48    7      1   | 4
| 7    4    9   | 1  3  '2"8 | 5     6     "2'8 | 5
| 6   '1"8 "128 | 5  7   248 | 489  '298!   3   | 6
|---------------+------------+------------------|
| 4    9   '1"8 | 3  2   7   |"168  `5``8! ``5`6| 7
| 5   "1'2  7   | 4  8   6   |'1"3  "2'3    9   | 8
|"2'8  3    6   | 9  1   5   | 7     4      '2"8| 9
'---------------+------------+------------------'

Since (',") are opposite colors, we immediately have -8r2c2, -8 r6c8 [both see ("8)r6c2,('8)r2c8].
Due to ('8)r2c8 and (``8)r7c8 [in the same column], we cannot have both colors true, so one of
the opposite colors " or ` must be true.
This implies that -8 r7c8, because it sees ("8)r9c9 and (`5)r7c8.
This last elimination implies that all ``-colored digits are false and all `-colored digits are true.
Now, (8)r3c1=(8)r3c2 (LC) implies -8 r3c78, and so r2c8='8.
In turn, this implies that all '-colored digits are true => ste.
Thanks for the puzzle!
Regards,
jco
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Re: Steve Stumble 2/26/2021

Postby SteveG48 » Sat Feb 27, 2021 2:40 pm

Code: Select all
 *--------------------------------------------------*
 | 9    7    5    | 8    46   3    | 2    1    46   |
 | 1    68   4    | 2    5    9    | 368 e8-3  7    |
 |c28  c268  3    | 7    46   1    | 689 d589  456  |
 *----------------+----------------+----------------|
 | 3    5    28   | 6    9    248  | 48   7    1    |
 | 7    4    9    | 1    3    28   | 5    6    28   |
 | 6   c18   128  | 5    7    248  | 489 d289  3    |
 *----------------+----------------+----------------|
 | 4    9   c18   | 3    2    7    | 168 d58   56   |
 | 5  bc12   7    | 4    8    6    | 13  a23   9    |
 | 28   3    6    | 9    1    5    | 7    4    28   |
 *--------------------------------------------------*


Suggested by JCO's solution:

(3=2)r8c8 - 2r8c2 = ((18)b7p35)&((18)r68c2)&((28)r3c12) - 8r367c8 = 8r2c8 => -3 r2c8 ; stte
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Re: Steve Stumble 2/26/2021

Postby jco » Sat Feb 27, 2021 4:37 pm

Hello SteveG48,
SteveG48 wrote:
Code: Select all
 *--------------------------------------------------*
 | 9    7    5    | 8    46   3    | 2    1    46   |
 | 1    68   4    | 2    5    9    | 368 e8-3  7    |
 |c28  c268  3    | 7    46   1    | 689 d589  456  |
 *----------------+----------------+----------------|
 | 3    5    28   | 6    9    248  | 48   7    1    |
 | 7    4    9    | 1    3    28   | 5    6    28   |
 | 6   c18   128  | 5    7    248  | 489 d289  3    |
 *----------------+----------------+----------------|
 | 4    9   c18   | 3    2    7    | 168 d58   56   |
 | 5  bc12   7    | 4    8    6    | 13  a23   9    |
 | 28   3    6    | 9    1    5    | 7    4    28   |
 *--------------------------------------------------*


Suggested by JCO's solution:

(3=2)r8c8 - 2r8c2 = ((18)b7p35)&((18)r68c2)&((28)r3c12) - 8r367c8 = 8r2c8 => -3 r2c8 ; stte


Wow! Very ingenious, great move!

Regards,
jco
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