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Daily Sudoku for 14-Oct-2018 - Extreme

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Mon Oct 15, 2018 6:27 pm    Post subject: Daily Sudoku for 14-Oct-2018 - Extreme Reply with quote
Code:

+-------+-------+-------+
| . . . | 7 3 4 | . . . |
| . 1 . | . . . | 9 4 . |
| 6 . . | . . . | . . 7 |
+-------+-------+-------+
| . . . | 4 . . | 8 5 . |
| 7 . 3 | . . . | 4 . 9 |
| . 6 8 | . . 5 | . . . |
+-------+-------+-------+
| 5 . . | . . . | . . 1 |
| . 9 6 | . . . | . 3 . |
| . . . | 5 9 6 | . . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Tue Oct 16, 2018 3:07 am    Post subject: Reply with quote
Hello all.

After Basics:
Code:

+--------------+---------------+--------------+
| 29   8   259 | 7    3    4   | 1   6   25   |
| 23   1   7   | 268  2568 28  | 9   4   2358 |
| 6    34  245 | 128  1258 9   | 235 28  7    |
+--------------+---------------+--------------+
| 19   2   19  | 4    7    3   | 8   5   6    |
| 7    5   3   | 1268 1268 128 | 4   12  9    |
| 4    6   8   | 9    12   5   | 237 127 23   |
+--------------+---------------+--------------+
| 5    47  24  | 3    248  278 | 6   9   1    |
| 28   9   6   | 12   124  127 | 257 3   2458 |
| 1238 347 124 | 5    9    6   | 27  278 248  |
+--------------+---------------+--------------+

Play this puzzle online at the Daily Sudoku site

There are various ways of attacking this one, but I liked what was an "almost" UR Type 6 on 12 in r56c58. Most likely it is merely a deadly pattern on 12. So I went with Paolo's method of finding a possible contradiction. If R5C8=1=>contradiction =>-1R5C8=>solution. A good following rinse leaves a Type 1 UR on 68 in r25c45, with the extra candidate of 5 in r2c5 (which can be placed). stte

cheers all, and great puzzle Clement...immp
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Tue Oct 16, 2018 3:31 am    Post subject: Reply with quote
Here is the grid after the good rinse:

Code:

+----------+-----------+--------+
| 29 8 259 | 7  3   4  | 1 6 25 |
| 3  1 7   | 68 568 28 | 9 4 25 |
| 6  4 25  | 12 15  9  | 3 8 7  |
+----------+-----------+--------+
| 19 2 19  | 4  7   3  | 8 5 6  |
| 7  5 3   | 68 68  1  | 4 2 9  |
| 4  6 8   | 9  2   5  | 7 1 3  |
+----------+-----------+--------+
| 5  7 24  | 3  48  28 | 6 9 1  |
| 28 9 6   | 12 14  7  | 5 3 48 |
| 18 3 14  | 5  9   6  | 2 7 48 |
+----------+-----------+--------+

Play this puzzle online at the Daily Sudoku site

This is where I used the Type 1 UR on 68 in r25c45. r2c5<>68(=5!). There is also a possible BUG+1 on 2 in r1c3, in which r1c3=2.

thanks again Clement...immp
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Wed Oct 17, 2018 8:40 am    Post subject: Daily Sudoku for 14-Oct-2018 - Extreme Reply with quote
Initial elimination using AIC leaves a UR like immpy
Code:

+---------------------+---------------------+---------------------+
| 29      8      f259 | 7       3       4   | 1      6      e25   |
| 23      1       7   | 268     2568    28  | 9      4       2358 |
| 6     ha4-3    g245 | 128     1258    9   |b235    28      7    |
+---------------------+---------------------+---------------------+
| 19      2       19  | 4       7       3   | 8      5       6    |
| 7       5       3   | 1268    1268    128 | 4      12      9    |
| 4       6       8   | 9       12      5   |c237    127    d23   |
+---------------------+---------------------+---------------------+
| 5       47      24  | 3       248     278 | 6      9       1    |
| 28      9       6   | 12      124     127 | 257    3       2458 |
| 1238    347     124 | 5       9       6   | 27     278     248  |
+---------------------+---------------------+---------------------+

(4=3)r3c2 - r3c7 = r6c7 - (3=2)r6c9 - (2=5)r1c9 - r1c3 = (5-4)r3c3 = (4)r3c2 => - 3r3c2 leads to
Code:

+------------------+-------------------+----------------+
| 29     8     259 | 7      3       4  | 1     6     25 |
| 3      1     7   |#68    #5-68    28 | 9     4     25 |
| 6      4     25  | 12     15      9  | 3     8     7  |
+------------------+-------------------+----------------+
| 19     2     19  | 4      7       3  | 8     5     6  |
| 7      5     3   |#68    #68      1  | 4     2     9  |
| 4      6     8   | 9      2       5  | 7     1     3  |
+------------------+-------------------+----------------+
| 5      7     24  | 3      48      28 | 6     9     1  |
| 28     9     6   | 12     14      7  | 5     3     48 |
| 18     3     14  | 5      9       6  | 2     7     48 |
+------------------+-------------------+----------------+

Type 1 UR (68)r25c45 => - 68r2c5; stte
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