dailysudoku.com Forum Index dailysudoku.com
Discussion of Daily Sudoku puzzles
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Impossible Menneske No. 03

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other puzzles
View previous topic :: View next topic  
Author Message
keith



Joined: 19 Sep 2005
Posts: 3178
Location: near Detroit, Michigan, USA

PostPosted: Fri Mar 01, 2013 11:06 pm    Post subject: Impossible Menneske No. 03 Reply with quote

Not as impossible as No. 2?

Code:
 M6912824 Impossible (4007)
+-------+-------+-------+
| 8 3 . | 7 4 . | . . . |
| . . 6 | . . . | . . 9 |
| 2 . . | 6 . . | . 8 . |
+-------+-------+-------+
| . . 4 | . . 8 | . . . |
| . 9 . | . . . | . 3 . |
| . . . | 1 . . | 7 . . |
+-------+-------+-------+
| . 5 . | . . 2 | . . 8 |
| 9 . . | . . . | 5 . . |
| . . . | . 1 . | . 6 4 |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

Keith


Last edited by keith on Sun Mar 17, 2013 4:31 am; edited 1 time in total
Back to top
View user's profile Send private message
JC Van Hay



Joined: 13 Jun 2010
Posts: 372
Location: Charleroi, Belgium

PostPosted: Sat Mar 02, 2013 10:09 am    Post subject: Reply with quote

#1. LS and LC; UP25

Solving NP(37)r38c9 ...
Code:
+-----------------------+------------------+-------------------+
| 8        3      (59)  | 7    4      159  | 126   125    1256 |
| 1-5(47)  14(7)  6     | 28   28     135  | 134   15(7)  9    |
| 2        147    (579) | 6    359    1359 | 134   8      37   |
+-----------------------+------------------+-------------------+
| 13567    1267   4     | 235  23567  8    | 1269  1259   1256 |
| 1567     9      257   | 245  2567   4567 | 8     3      1256 |
| 356      268    2358  | 1    23569  3569 | 7     4      256  |
+-----------------------+------------------+-------------------+
| (46)     5      13(7) | 349  3(67)  2    | 139   19(7)  8    |
| 9        46     12    | 348  3678   3467 | 5     12     37   |
| 37       278    2378  | 359  1      357  | 239   6      4    |
+-----------------------+------------------+-------------------+
#2. Chain[6] : 4r2c1=(4-6)r7c1=(6-7)r7c5=FXWing(7R27)-(7=59)r13c3 :=> -5r2c1
#3. Chain[3] : 7r3c9=(7-5)r2c8=(5-3)r2c6=3r2c7 :=> -3r3c9; LS and LC -> UP31

Solving B9 ...
Code:
+------------------------+--------------------+------------------+
| 8       3       59     | 7      4      159  | 126    125  126  |
| (147)   147     6      | 28     28     135  | 34     15   9    |
| 2       (14)    59     | 6      5(3)   1359 | (34)   8    7    |
+------------------------+--------------------+------------------+
| 156(7)  126(7)  4      | 23     2(37)  8    | 126    9    1256 |
| 16      9       2(7)   | 245    257    47   | 8      3    16   |
| 35      28      238    | 1      9      6    | 7      4    25   |
+------------------------+--------------------+------------------+
| 6(4)    5       (13)   | 3(49)  6(3)   2    | -1(9)  7    8    |
| 9       46      12     | 48     678    47   | 5      12   3    |
| (37)    278     238(7) | 359    1      35   | 29     6    4    |
+------------------------+--------------------+------------------+
#4. Chain[10] : Kraken Cell (147)r2c1 -> 1r7c3=9r7c7 :=> -1r7c9

1r2c1-(1=4)r3c2-(4=3)r3c7-3r3c5=*[3r7c5=(3-7)r4c5=7r4c12-7r5c3=7r9c3-(7=3)r9c1]-(3=1)r7c3
||
4r2c1-4r7c1=(4-9)r7c4=9r7c7
||
7r2c1-(7=3)r9c1-(3=1)r7c3
Back to top
View user's profile Send private message
oaxen



Joined: 10 Jul 2006
Posts: 96

PostPosted: Sat Mar 02, 2013 4:00 pm    Post subject: Reply with quote

We will se. Now I shall ask my butler to prepare a nice cup of tea and start the work.
Back to top
View user's profile Send private message Visit poster's website
DonM



Joined: 15 Sep 2009
Posts: 51

PostPosted: Sun Mar 03, 2013 12:37 am    Post subject: Reply with quote

oaxen wrote:
We will se. Now I shall ask my butler to prepare a nice cup of tea and start the work.


Don't forget the pencil & paper so you don't forget the solution this time. Wink
Back to top
View user's profile Send private message
oaxen



Joined: 10 Jul 2006
Posts: 96

PostPosted: Sun Mar 03, 2013 11:47 am    Post subject: Reply with quote

Don't forget the pencil & paper so you don't forget the solution this time.

I started in block H to find out wich ones of the fives is correct. Turned out to be R9C6. That gives a few other correct numbers and eliminations. My next step was to check the sixes in the same block H. Six in R7C5 leads to a complete solution.
Best with Menneske is that they always demand at least a two step solution. Thank you Keith for providing them to this site. It is more fun to take part in a discussion.
Lars
Back to top
View user's profile Send private message Visit poster's website
DonM



Joined: 15 Sep 2009
Posts: 51

PostPosted: Mon Mar 11, 2013 7:49 pm    Post subject: Reply with quote

oaxen wrote:
Don't forget the pencil & paper so you don't forget the solution this time.

I started in block H to find out wich ones of the fives is correct. Turned out to be R9C6.

oaxen, I'm just interested: How did you determine which of the 5s were correct in box 8 (your block H)?


Last edited by DonM on Mon Mar 11, 2013 8:06 pm; edited 1 time in total
Back to top
View user's profile Send private message
DonM



Joined: 15 Sep 2009
Posts: 51

PostPosted: Mon Mar 11, 2013 8:01 pm    Post subject: Reply with quote

Finally got some time to get to this which IMO was the more difficult of the first 4 Menneske Impossibles:

Menneske Impossible 4 (ER=8.3) SSTS (post Simple Sudoku Technique Set):
Code:
 
 *--------------------------------------------------------------------*
 | 8      3      59     | 7      4      159    | 126    125    1256   |
 | 1457   147    6      | 28     28     135    | 134    157    9      |
 | 2      147    579    | 6      359    1359   | 134    8      37     |
 |----------------------+----------------------+----------------------|
 | 13567  1267   4      | 235    23567  8      | 1269   1259   1256   |
 | 1567   9      257    | 245    2567   4567   | 8      3      1256   |
 | 356    268    2358   | 1      23569  3569   | 7      4      256    |
 |----------------------+----------------------+----------------------|
 | 46     5      137    | 349    367    2      | 139    179    8      |
 | 9      46     12     | 348    3678   467    | 5      12     37     |
 | 37     278    2378   | 359    1      357    | 239    6      4      |
 *--------------------------------------------------------------------*

1. aur(14)r23c27[(7)r23c2=(3)r23c7]-(3=7)r3c9 => -7r3c3 -> np(59)r13c3: -5r2c1, -5r56c3
2. (5)r2c8=(5-3)r2c6=r2c7-grp(3)r79c7=r8c9-(3=7)r3c9 => -7r2c8 -> several singles -> lc(7)b8: -7r9c6 -> nq(1359)r1239c6 => r6c6=6 -> r6c5=9

Code:

 *--------------------------------------------------------------------*
 | 8      3      59     | 7      4      159    | 126    125    1256   |
 | 147    147    6      | 28     28     135    | 134    15     9      |
 | 2      14     59     | 6      35     1359   | 134    8      7      |
 |----------------------+----------------------+----------------------|
 | 13567  1267   4      | 235    2357   8      | 126    9      1256   |
 | 1567   9      27     | 245    257    47     | 8      3      1256   |
 | 35     28     238    | 1      9      6      | 7      4      25     |
 |----------------------+----------------------+----------------------|
 | 46     5      13     | 349    36     2      | 19     7      8      |
 | 9      46     12     | 48     678    47     | 5      12     3      |
 | 37     278    2378   | 359    1      35     | 29     6      4      |
 *--------------------------------------------------------------------*

3. aur(28)r69c23[(3)r6c3=(2)r9c7]-r8c8=(2-1)r8c3=(1)r7c3 => -3r7c3
stte
Back to top
View user's profile Send private message
oaxen



Joined: 10 Jul 2006
Posts: 96

PostPosted: Tue Mar 12, 2013 9:15 am    Post subject: Reply with quote

I started in block H to find out wich ones of the fives is correct. Turned out to be R9C6.[/quote]
oaxen, I'm just interested: How did you determine which of the 5s were correct in box 8 (your block H)?[/quote]

I checked them both simultaneously. I guess that is the meaning with Sudoko. Find some favourable bivalues and work further from them. Rather soon one find that in the both cases one or more boxes have the same values - and after that it is normal to go on with pure basics technique
Back to top
View user's profile Send private message Visit poster's website
DonM



Joined: 15 Sep 2009
Posts: 51

PostPosted: Tue Mar 12, 2013 9:49 pm    Post subject: Reply with quote

oaxen wrote:
I started in block H to find out wich ones of the fives is correct. Turned out to be R9C6.

DonM wrote:

oaxen, I'm just interested: How did you determine which of the 5s were correct in box 8 (your block H)?


oaxen wrote:

I checked them both simultaneously. I guess that is the meaning with Sudoko. Find some favourable bivalues and work further from them. Rather soon one find that in the both cases one or more boxes have the same values - and after that it is normal to go on with pure basics technique

Thanks. I think I've got it.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other puzzles All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group