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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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 Posted: Sun Aug 28, 2011 5:01 pm Post subject: Diabolical, August 26 |
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These are usually pretty easy, but then I ran into this beast. I can see a few unproductive moves, but that's it. I feel like I've made a mistake or am missing something, because it doesn't seem it would be this difficult.
| Code: |
+----------------+-------------------+------------------+
| 567 9 257 | 3 1 4 | 25 8 256 |
| 468 3 1 | 268 2568 568 | 7 9 246 |
| 4568 568 245 | 268 9 7 | 1 2345 23456 |
+----------------+-------------------+------------------+
| 1 57 8 | 2479 2457 359 | 245 6 2345 |
| 9 56 345 | 12468 24568 13568 | 2458 12345 7 |
| 34567 2 3457 | 14678 45678 13568 | 9 1345 18 |
+----------------+-------------------+------------------+
| 278 78 9 | 5 3 16 | 2468 124 18 |
| 25 1 6 | 489 48 89 | 3 7 25 |
| 358 4 35 | 167 67 2 | 568 15 9 |
+----------------+-------------------+------------------+
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Play this puzzle online at the Daily Sudoku site |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Aug 28, 2011 9:45 pm Post subject: |
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An almost xy-wing does the trick..........
axy-wing(15-8)[r7c9+r9c18]=(3)r9c1-(3=5=1)r9c38-(1=8)r7c9; r7c12,r9c7<>8
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Aug 28, 2011 9:58 pm Post subject: |
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I don't see anything. An SS on 1 leads nowhere.
Keith |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Aug 28, 2011 10:37 pm Post subject: |
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A second solution is an almost naked pair. It makes the same deletions as the almost xy-wing.
anp(8=35)r9c13-(5=1)r9c8-(1=8)r7c9; r7c12,r9c7<>8
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Mon Aug 29, 2011 4:45 am Post subject: |
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Marty, according to my solver, it needs a short chain.
r9c7=8 r7c9=1 r7c6=6 r7c7<>6 r9c7=6; contradiction => r9c7<>8
Regards, Danny
[corrected post to indicate that my solver was used.] |
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