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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Fri Mar 01, 2013 11:06 pm Post subject: Impossible Menneske No. 03 |
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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 |
+-------+-------+-------+
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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 |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Sat Mar 02, 2013 10:09 am Post subject: |
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#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
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4r2c1-4r7c1=(4-9)r7c4=9r7c7
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7r2c1-(7=3)r9c1-(3=1)r7c3 |
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oaxen
Joined: 10 Jul 2006
Posts: 96
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| Posted: Sat Mar 02, 2013 4:00 pm Post subject: |
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| We will se. Now I shall ask my butler to prepare a nice cup of tea and start the work. |
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DonM
Joined: 15 Sep 2009
Posts: 51
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| Posted: Sun Mar 03, 2013 12:37 am Post subject: |
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| 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.  |
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oaxen
Joined: 10 Jul 2006
Posts: 96
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| Posted: Sun Mar 03, 2013 11:47 am Post subject: |
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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 |
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DonM
Joined: 15 Sep 2009
Posts: 51
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| Posted: Mon Mar 11, 2013 7:49 pm Post subject: |
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| 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 |
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DonM
Joined: 15 Sep 2009
Posts: 51
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| Posted: Mon Mar 11, 2013 8:01 pm Post subject: |
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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 |
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oaxen
Joined: 10 Jul 2006
Posts: 96
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| Posted: Tue Mar 12, 2013 9:15 am Post subject: |
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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 |
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DonM
Joined: 15 Sep 2009
Posts: 51
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| Posted: Tue Mar 12, 2013 9:49 pm Post subject: |
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| 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. |
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