September 16, 2017

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September 16, 2017

Postby ArkieTech » Fri Sep 15, 2017 11:21 pm

Code: Select all
 *-----------*
 |7..|.32|...|
 |.4.|1..|.6.|
 |21.|.7.|.5.|
 |---+---+---|
 |6..|72.|.8.|
 |...|...|...|
 |.2.|.83|..6|
 |---+---+---|
 |.8.|.6.|.24|
 |.5.|..8|.3.|
 |...|24.|..9|
 *-----------*


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dan
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Re: September 16, 2017

Postby Leren » Fri Sep 15, 2017 11:59 pm

Code: Select all
*------------------------------------------*
| 7   c69  5    | 468 3 2   | 149   49  18 |
| 8    4   3    | 1   5 9   | 7     6   2  |
| 2    1  b69   | 468 7 46  |a49-3  5   38 |
|---------------+-----------+--------------|
| 6   d39  149  | 7   2 14  |e134-9 8   5  |
| 15   37  8    | 456 9 146 | 2     47  13 |
| 159  2   1479 | 45  8 3   | 149   479 6  |
|---------------+-----------+--------------|
| 19   8   19   | 3   6 7   | 5     2   4  |
| 4    5   2    | 9   1 8   | 6     3   7  |
| 3    67  67   | 2   4 5   | 8     1   9  |
*------------------------------------------*

L2 Wing: (9) r3c7 = r3c3 - r1c2 = (9-3) r4c2 = (3) r4c7 => - 3 r3c7, - 9 r4c7; stte

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Re: September 16, 2017

Postby SteveG48 » Sat Sep 16, 2017 12:06 am

Code: Select all
 *-----------------------------------------------------------*
 | 7    b69    5     | 468   3     2     | 149  a49    18    |
 | 8     4     3     | 1     5     9     | 7     6     2     |
 | 2     1    c69    | 468   7     46    | 349   5     38    |
 *-------------------+-------------------+-------------------|
 | 6     39   c149   | 7     2     14    | 1349  8     5     |
 | 15    3-7   8     | 456   9     146   | 2    a47    13    |
 | 159   2    c1479  | 45    8     3     | 149   49-7  6     |
 *-------------------+-------------------+-------------------|
 | 19    8    c19    | 3     6     7     | 5     2     4     |
 | 4     5     2     | 9     1     8     | 6     3     7     |
 | 3     67    67    | 2     4     5     | 8     1     9     |
 *-----------------------------------------------------------*


(7=49)r15c8 - (9=6)r1c2 - (6=1479)r3467c3 => -7 r5c2,r6c8 ; stte

How come my death blossoms never grow more than two petals? :(
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Re: September 16, 2017

Postby Marty R. » Sat Sep 16, 2017 1:43 am

Code: Select all
+-------------+-----------+-------------+
| 7   69 5    | 468 3 2   | 149  49  18 |
| 8   4  3    | 1   5 9   | 7    6   2  |
| 2   1  69   | 468 7 46  | 349  5   38 |
+-------------+-----------+-------------+
| 6   39 149  | 7   2 14  | 1349 8   5  |
| 15  37 8    | 456 9 146 | 2    47  13 |
| 159 2  1479 | 45  8 3   | 149  479 6  |
+-------------+-----------+-------------+
| 19  8  19   | 3   6 7   | 5    2   4  |
| 4   5  2    | 9   1 8   | 6    3   7  |
| 3   67 67   | 2   4 5   | 8    1   9  |
+-------------+-----------+-------------+

Play this puzzle online at the Daily Sudoku site

M-Wing (9=3)r4c2-r4c7=(3-9)r3c7=r1c78=> -9r1c2
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Re: September 16, 2017

Postby Marty R. » Sat Sep 16, 2017 1:44 am

How come my death blossoms never grow more than two petals? :(


Because they're dead?
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Re: September 16, 2017

Postby SteveG48 » Sat Sep 16, 2017 1:38 pm

Marty R. wrote:
How come my death blossoms never grow more than two petals? :(


Because they're dead?


Good point! :lol:
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Re: September 16, 2017

Postby Sudtyro2 » Sat Sep 16, 2017 8:05 pm

Code: Select all
*--------------------------------------------------------*
| 7    *69    5    | 468   3     2    | 149  c49    18   |
| 8     4     3    | 1     5     9    | 7     6     2    |
| 2     1     69   | 468   7     46   |*349   5     38   |
|------------------+------------------+------------------|
| 6    b39   a149  | 7     2     14   | 1349  8     5    |
| 15   b37    8    | 456   9     146  | 2    c47    13   |
| 159   2     1479 | 45    8     3    | 149  *497   6    |
|------------------+------------------+------------------|
| 19    8     19   | 3     6     7    | 5     2     4    |
| 4     5     2    | 9     1     8    | 6     3     7    |
| 3     67    67   | 2     4     5    | 8     1     9    |
*--------------------------------------------------------*
Some easy patterns in the 9s grid...
The three cells marked (*) are stte exclusions. Except for 9r4c3, all other unmarked 9s can eventually "see" a marked exclusion in b13 via X-chains, but 9r4c3 does need an X-Y chain. So, here are just a few simple patterns having those two stte exclusions. Chains for the fins(f), guardians(g), and kraken digits are left for the reader to easily construct. The special X-Y chain fragment needed for 9r4c3 is 9r4c3 - (9=37)r45c2 - (7=49)r15c8 ... as labeled above.
Code: Select all
Finned 1-Fish:
        r4\c2 + rfr4c37  => -9r1c2;
        c3\r3 + rfr467c3 => -9r3c7;
Franken c3\b1 + rfr467c3 => -9r1c2;

Code: Select all
5-Link Oddagon:
r4c2,b1p29,r34c7 + gr16c7,r4c3 => -9r1c2 or -9r3c7

Code: Select all
Kraken units:
Row r4 => -9r1c2 or -9r3c7;
Box b4 => -9r1c2 or -9r3c7;
Col c3 => -9r1c2 or -9r3c7;

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