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zx
Joined: 21 Apr 2008
Posts: 6
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 Posted: Sun Dec 21, 2008 1:16 am Post subject: next step? |
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| Code: |
+------------+-----------+-----------+
| 79 3 579 | 6 2 1 | 8 4 57 |
| 27 4 1 | 3 58 58 | 26 9 67 |
| 8 25 6 | 9 7 4 | 12 13 35 |
+------------+-----------+-----------+
| 5 7 3 | 4 1 2 | 9 6 8 |
| 6 1 2 | 78 89 789 | 3 5 4 |
| 4 89 89 | 5 6 3 | 7 2 1 |
+------------+-----------+-----------+
| 379 89 789 | 1 4 6 | 5 38 2 |
| 123 6 58 | 27 59 79 | 4 138 39 |
| 129 25 4 | 28 3 589 | 16 7 69 |
+------------+-----------+-----------+
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Having trouble with the next step... been staring at this thing on and off for a few days. I usually can solve everything with X, XY, and XYZ wings. The UR in boxes 4 and 7 is there, but I prefer not to use them and I don't think that this one helps much anyway.
This is from here, btw, just a way oldie from dec. 26 06.
Thanks! |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Dec 21, 2008 1:33 am Post subject: |
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| There must be something simpler. But note the 39-59-35 XY-Wing pivoted in r8c9. Then transport the 5 pincer from r3c9 to r1c3 and remove the 5 from r8c3. I saw numerous XY-Wings that eliminate nothing. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sun Dec 21, 2008 1:37 am Post subject: |
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| Code: | +------------+-----------+-----------+
| 379 89 789 | 1 4 6 | 5 38 2 |
| 123 6 58 | 27 59 79 | 4 138 39 |
|12-9 25 4 | 28 3 589 | 16 7 69 |
+------------+-----------+-----------+ |
this is the bottom third of the puzzle, look in row 7 in box 7. the 9 is locked into row 7. means the 9 can be eliminated from r9c1.
this leads to a "rare square" xy-wing |
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zx
Joined: 21 Apr 2008
Posts: 6
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| Posted: Sun Dec 21, 2008 1:55 am Post subject: |
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awesome, norm. i figured i was missing something simple like that, and it usually is that simple when i stare at a puzzle for hours. thanks.
the empty xy wings were mostly because i already caught them... there were a bunch in this puzzle. that minus 9 opens up a big xy wing in r9c1, r9c7, and r2c7, eliminating the 2 in r2c1. that does it.
thanks guys. |
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