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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Tue Dec 15, 2009 5:33 pm Post subject: Puzzle XY 09/12/15 BBDB+++ |
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As the intro to Monk goes ... It's a jungle out there!
| Code: | +-----------------------+
| 1 . . | . 8 . | . . . |
| . 9 7 | . 2 . | 1 4 . |
| . 3 4 | 7 1 . | . 5 8 |
|-------+-------+-------|
| . . 8 | 1 . . | . . 5 |
| 9 7 3 | . 5 . | . 1 . |
| . . . | . . . | . . . |
|-------+-------+-------|
| . 8 . | . . . | . 9 . |
| . 5 2 | . 9 . | 8 . 7 |
| . . 9 | 3 . . | . 2 1 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
[Edit: changed classification from NR to XY.]
Last edited by daj95376 on Wed Dec 16, 2009 11:17 pm; edited 1 time in total |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Dec 16, 2009 8:40 pm Post subject: |
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| I do try to reduce the number of steps by looking for backdoors and removing uncessary steps. I have worked this one down to six steps needed. two x-wings, a kite, a skyscraper, a w-wing and an xyz-wing. A good puzzle. I have yet to find the door. Has anyone had better luck? |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Dec 16, 2009 11:33 pm Post subject: |
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| arkietech wrote: | | I do try to reduce the number of steps by looking for backdoors and removing uncessary steps. I have worked this one down to six steps needed. two x-wings, a kite, a skyscraper, a w-wing and an xyz-wing. A good puzzle. I have yet to find the door. Has anyone had better luck? |
The W-Wing (or a gM-Wing) is probably as good as it gets. For added adventure, try bypassing any W-Wing or gM-Wing. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Thu Dec 17, 2009 1:04 am Post subject: |
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I started with the obvious x-wing 9, and then I found a w-wing 36.
At that point I struggled until I found a xyz-wing 469 that I have previously missed! I sure paid the price on overlooking this move previously.
Straightforward skyscraper on 6 and an ER on 6 completed the puzzle.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Dec 17, 2009 8:31 pm Post subject: |
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| I used four ERs, all on 9, then a Hidden UR on 67, then stuck. A Medusa wrap opened things up, after which a flightless XY-Wing on 673 with pincer transport finished it off. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Thu Dec 17, 2009 10:34 pm Post subject: |
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This puzzle was exceptionally difficult. Congratulations to all who completed it 
| Code: | c49 X-Wing <> 9 r16c67 -or-
r34 X-Wing <> 9 r16c67
<49+6> XYZ-Wing r1c4/r3c6+r8c4 <> 6 r2c4
c24r1 Skyscraper <> 6 r8c1,r9c5
c5b9 Empty Rectangle <> 6 r4c8 -or-
r8c5 2-String Kite <> 6 r4c8
c48 X-Wing <> 6 r1c2679
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Puzzle can be cracked at this point.
| Code: | -3r4c5 6r4c5 6r8c4 3r8c8 [ W-Wing ] <> 3 r4c8 cracks puzzle
-6r4c6 7r4c6 7r1c8 6r1c4 [gM-Wing ] <> 6 r2c6 cracks puzzle
-6r8c8 3r8c8 3r4c5 6r7c5 [gM-Wing ] <> 6 r7c79,r8c4 cracks puzzle
+-----------------------------------------------------+
| 1 2 5 | 46 8 34 | 37 367 9 |
| 8 9 7 | 5 2 36 | 1 4 36 |
| 6 3 4 | 7 1 9 | 2 5 8 |
|-----------------+-----------------+-----------------|
| 2 4 8 | 1 36 67 | 9 37 5 |
| 9 7 3 | 8 5 24 | 46 1 246 |
| 5 1 6 | 9 34 247 | 347 8 234 |
|-----------------+-----------------+-----------------|
| 37 8 1 | 2 67 5 | 346 9 346 |
| 34 5 2 | 46 9 1 | 8 36 7 |
| 47 6 9 | 3 47 8 | 5 2 1 |
+-----------------------------------------------------+
# 32 eliminations remain
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If you bypass the W-Wing and gM-Wings, then the challenge continues.
| Code: | <47+3> XYZ-Wing r6c7/r4c8+r6c5 <> 3 r6c9
r56c69 <24> UR Type 6 <> 2 r5c9,r6c6
<34+7> XY-Wing r1c6/r1c7+r6c6 <> 7 r6c7 -or-
<47+3> XY-Wing r6c6/r1c6+r6c7 <> 3 r1c7
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