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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Fri Feb 04, 2011 3:33 pm Post subject: Free Press Feb 4, 2011 |
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Not yet started:
| Code: | Puzzle: FP020411
+-------+-------+-------+
| 7 8 . | . . . | . 4 . |
| . 6 . | . . . | . . . |
| 2 . 5 | . 4 . | 8 . 7 |
+-------+-------+-------+
| . . . | 1 5 . | . . . |
| 1 . 3 | . . . | 2 . 4 |
| . . . | . 9 2 | . . . |
+-------+-------+-------+
| 9 . 7 | 8 2 . | 4 . 5 |
| . . . | . . . | . 1 . |
| . 4 . | . . . | . 8 9 |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
Keith |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Fri Feb 04, 2011 11:05 pm Post subject: |
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What, no takers?
After basics: | Code: | +-------------------+-------------------+-------------------+
| 7 8 19 | 2 36 3569 | 13569 4 136 |
| 34 6 149 | 3579 378 35789 | 1359 2 13 |
| 2 39 5 | 369 4 1 | 8 369 7 |
+-------------------+-------------------+-------------------+
| 468 2 4689 | 1 5 34 | 369 7 368 |
| 1 59 3 | 67 678 678 | 2 59 4 |
| 4568 7 468 | 34 9 2 | 136 356 1368 |
+-------------------+-------------------+-------------------+
| 9 1 7 | 8 2 36 | 4 36 5 |
| 3568 35 68 | 49 367 49 | 367 1 2 |
| 36 4 2 | 3567 1 3567 | 367 8 9 |
+-------------------+-------------------+-------------------+ |
| Quote: | I managed to solve it with the usual toolkit of wings and kites, but it did take six steps.
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Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Feb 05, 2011 12:09 am Post subject: |
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| I'm encountering a lot of difficult puzzles lately and this was no exception. I played an X-Wing, W-Wing and two Skyscrapers before getting stuck. At that point I turned to Medusa and a wrap reduced the grid to a BUG+1. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Feb 05, 2011 12:44 am Post subject: |
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Marty,
This one is kind of driving me nuts. I can't retrace all my steps - I was trying to find the essential ones. It came down to solving R9C1 as 6 and eliminating 4 in R4C1. Here goes another try:
After basics there is an X-wing 9 in C28 and an XYZ-wing 1-36 in R1B3. Then, skyscrapers eliminate 3 in R6C8 and R8C5. Leaving us here:
| Code: | +----------------+----------------+----------------+
| 7 8 19 | 2 3 59 | 1569 4 16 |
| 34 6 149 | 59 78 78 | 1359 2 13 |
| 2 39 5 | 6 4 1 | 8 39 7 |
+----------------+----------------+----------------+
| 468 2 4689 | 1 5 34 | 369 7 368 |
| 1 59 3 | 7 68 68 | 2 59 4 |
| 4568 7 468 | 34 9 2 | 136 56 1368 |
+----------------+----------------+----------------+
| 9 1 7 | 8 2 36 | 4 36 5 |
| 3568 35 68 | 49 67 49 | 367 1 2 |
| 36 4 2 | 35 1 3567 | 367 8 9 |
+----------------+----------------+----------------+ |
The skyscraper in C28 takes out 3 in R8C7 (solving R9C1) and we are here:
| Code: | +----------------+----------------+----------------+
| 7 8 19 | 2 3 59 | 1569 4 16 |
| 34@ 6 149 | 59 78 78 | 1359 2 13 |
| 2 39# 5 | 6 4 1 | 8 39# 7 |
+----------------+----------------+----------------+
|-48 2 469 | 1 5 34@ | 369 7 368 |
| 1 59 3 | 7 68 68 | 2 59 4 |
| 458 7 46 | 34 9 2 | 136 56 1368 |
+----------------+----------------+----------------+
| 9 1 7 | 8 2 36# | 4 36# 5 |
| 35 35 8 | 49 67 49 | 67 1 2 |
| 6 4 2 | 35 1 357 | 37 8 9 |
+----------------+----------------+----------------+ |
The strong links # in R37 excite the W-wing pincers @, solving R4C1 as 8. There results a BUG+1, or your choice of a couple of -6 XY-wings to finish it off.
That first X-wing is crucial.
I suppose that is seven steps.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Feb 05, 2011 1:09 am Post subject: |
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| I don't know what my intermediate grid looked like, but if it resembled yours, I'd miss that W-Wing most of the time. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Feb 05, 2011 1:54 am Post subject: |
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| Marty R. wrote: | | I don't know what my intermediate grid looked like, but if it resembled yours, I'd miss that W-Wing most of the time. |
Marty,
Me, too!
In this case I went on a big hunt for kites, W-wings and M-wings involving all those bi-value cells that include 3.
Keith |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sat Feb 05, 2011 9:19 am Post subject: |
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Seemed like a never-ending barage of turbot moves on 3...
I count six moves but sounds the same as Keith.
| Code: | x-wing(9) c2, c8 ; r3c4<>9
skyscraper(3) c2, c5 ; r3c4<>9
er(3) r7, b5 ; r6c8<>3
skyscraper(3) c2, c8 ; r8c7<>8
m-wing-like(36) ; (3=4)r6c4-(4=6)r6c3 - r6c8=(6-3)r7c8=r7c6 ; r9c4<>3, r4c6<>3
BUG+1 ; r4c7=6 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sat Feb 05, 2011 6:09 pm Post subject: |
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| This puzzle didn't seem to offer much lee-way. Six moves and an extraneous XYZ-Wing. |
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royalina
Joined: 21 Feb 2011
Posts: 4
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| Posted: Mon Feb 21, 2011 6:41 am Post subject: |
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| W-Wing and two Skyscrapers before getting stuck. At that point I turned to Medusa and a wrap reduced the grid to a BUG+1.... |
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