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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Thu Mar 28, 2013 5:55 am Post subject: Impossible Menneske No. 11 |
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| Code: | M6911767 Impossible (4692)
+-------+-------+-------+
| . . . | . 4 . | . . . |
| . . 4 | . . 1 | . 9 . |
| . . . | 7 . . | 6 8 . |
+-------+-------+-------+
| . 8 . | 5 . . | . . . |
| . 9 . | . . . | . 4 . |
| . 6 . | . . 9 | . 3 . |
+-------+-------+-------+
| . 1 . | . . 3 | . . 7 |
| . . . | . . . | 9 . . |
| 6 . . | . 8 2 | . . . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
By the way, please note that I do not filter these puzzles in any way. They come from the Menneske site, based only on the rating of "Impossible". http://www.menneske.no/sudoku/eng/
Keith |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Thu Mar 28, 2013 8:27 am Post subject: |
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#1. UP27
Hidden Singles : r3c9=4, r3c3=6, r4c9=9
Naked Single : r3c6=5, r1c6=8
Hidden Single : r2c1=8
LC(1) :=> -1r1c1
LC(4) :=> -4r78c1
Finned XWing(6C69) :=> -6r5c45 ![Optional]
LC(7) :=> -7r8c123
Finned XWing(8C18) :=> -8r4c3 ![Optional]
Skyscraper (9R19) :=> -9r3c3.r7c1 ![Only -9r3c3 required for the loop below]
#2.
| Code: | +---------------------------+-----------------------+-------------------------+
| -235(79) 235(7) 6 | 23(9) 4 8 | 12357 1257 1235 |
| 8 235(7) 4 | 236 236 1 | 2357 9 235 |
| 1239 23 123 | 7 23(9) 5 | 6 8 4 |
+---------------------------+-----------------------+-------------------------+
| 12347 8 123 | 5 12367 467 | 127 1267 9 |
| 12357 9 12357 | 1238 1237 (67) | 12578 4 1258(6) |
| 12457 6 1257 | 1248 127 9 | 12578 3 1258 |
+---------------------------+-----------------------+-------------------------+
| 25 1 25-8(9) | 46-9 6(59) 3 | 24-5(8) 256 7 |
| 235 2345 2358 | 146 1-6(57) 46(7) | 9 1256 1235(68) |
| 6 345(7) -35(79) | 149 8 2 | 1345 15 135 |
+---------------------------+-----------------------+-------------------------+
Chain[10] : Loop{9r7c3=(9-7)r9c3=7r9c2-7r12c2=(7-9)r1c1=9r1c4-9r3c5=9r7c5}- ...
... -5r7c5=(5-7)r8c5=7r8c6-(7=6)r5c6-6r5c9=(6-8)r8c9=8r7c7
:=> [r9c3=79, r1c1=79, -9r7c4] ![Optional]
:=> [7r8c5=6r8c9 :=> -6r8c5], [5r7c5=8r7c7 :=> -5r7c7] ![Optional]
:=> [9r7c3=8r7c7 :=> -8r7c3 (r7c7=8)]
:=> UP34; XWing(6C69) :=> -6r8c48[+eventually -6r8c8.r5c45]; UP41
LC(5)[+eventually LC(7)] :=> r9c2=3; UP81 |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Thu Mar 28, 2013 6:04 pm Post subject: |
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| Code: | *-----------------------------------------------------------------------------*
| 23579 2357 6 | 239 4 8 | 12357 1257 1235 |
| 8 2357 4 | 236 236 1 | 2357 9 235 |
| 1239 23 1239 | 7 239 5 | 6 8 4 |
|-------------------------+-------------------------+-------------------------|
| 12347 8 1237 | 5 12367 467 | 127 1267 9 |
| 12357 9 12357 | 12368 12367 67 | 12578 4 12568 |
| 12457 6 1257 | 1248 127 9 | 12578 3 1258 |
|-------------------------+-------------------------+-------------------------|
| 259 1 2589 | 469 569 3 | 2458 256 7 |
| 235 2345 2358 | 146 1567 467 | 9 1256 123568 |
| 6 3457 3579 | 149 8 2 | 1345 15 135 |
*-----------------------------------------------------------------------------*
6r5c6-r4c6=(6-7)r4c8=7r1c8
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7r5c6-r8c6=(7-5)r8c5=(5-9)r7c5=r3c5-r1c4=9r1c1
=> -7r1c1; lclste |
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oaxen
Joined: 10 Jul 2006
Posts: 96
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| Posted: Wed Apr 03, 2013 9:23 am Post subject: |
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| A little bit easier than No 10. There are many bivalues and probably more ways to solve it. I found "9" in row 9 most promising and with parallell chains many digits are fixed in both cases. "9" in R9C4 is correct. |
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DonM
Joined: 15 Sep 2009
Posts: 51
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| Posted: Sun Apr 21, 2013 5:20 am Post subject: |
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Menneske Impossible 11 ER=7.2 post-SSTS:
| Code: |
*-----------------------------------------------------------------------------*
| 23579 2357 6 | 239 4 8 | 12357 1257 1235 |
| 8 2357 4 | 236 236 1 | 2357 9 235 |
| 1239 23 123 | 7 239 5 | 6 8 4 |
|-------------------------+-------------------------+-------------------------|
| 12347 8 1237 | 5 12367 467 | 127 1267 9 |
| 12357 9 12357 | 12368 12367 67 | 12578 4 12568 |
| 12457 6 1257 | 1248 127 9 | 12578 3 1258 |
|-------------------------+-------------------------+-------------------------|
| 25 1 2589 | 469 569 3 | 2458 256 7 |
| 235 2345 2358 | 146 1567 467 | 9 1256 123568 |
| 6 3457 3579 | 149 8 2 | 1345 15 135 |
*-----------------------------------------------------------------------------* |
(9)r3c5=(9-5)r7c5=(5-7)r8c5=r8c6-(7=6)r5c6-r5c9=(6-7)r4c8=r1c8-r2c7=r2c2-r9c2=(7-9)r9c3=(9)r9c4 => -9r1c4 -> r1c1=9
lcste |
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