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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Apr 17, 2009 1:46 pm Post subject: Set XY_02 Puzzle 5 -- Advanced |
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| Code: | +-----------------------+
| 8 . . | . 4 . | . . . |
| . . 3 | . . 5 | . . . |
| . 2 4 | . . 8 | . . 9 |
|-------+-------+-------|
| . . . | 7 . . | . 3 8 |
| 4 . . | . 6 2 | . 5 . |
| . 9 2 | . 8 . | 6 4 . |
|-------+-------+-------|
| . . . | . . 9 | . . . |
| . . . | 4 7 6 | . . . |
| . . 7 | 8 . . | . . 4 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
| Code: | c9b6 Naked Pair <> 17 [r1278c9]
r4 b4 Naked Triple <> 156 [r5c23],[r6c1]
b3 Naked Triple <> 126 [r1c79]
r1 b3 Naked Pair <> 35 [r1c4]
c8b3 Locked Candidate 1 <> 1 [r89c8]
XY-Wing [r2c9]/[r2c5]+[r3c8] <> 1 [r3c45]
Skyscraper c26r9 <> 3 [r5c4],[r6c1]
Skyscraper c24r5 <> 3 [r7c1],[r9c6] extraneous
turbot fish/ER c6b4 <> 3 [r9c2] extraneous
Empty Rectangle c8b1 <> 6 [r9c1]
W-Wing: 2/9 in r1c4,r8c8 connected by 9 in r18c3 => r1c8<>2
+-----------------------------------------------------+
| 8 16 169* | *29 4 7 | 35 26 35 |
| 69 7 3 | 29 1 5 | 4 8 26 |
| 5 2 4 | 6 3 8 | 7 1 9 |
|-----------------+-----------------+-----------------|
| 16 156 156 | 7 9 4 | 2 3 8 |
| 4 3 8 | 1 6 2 | 9 5 7 |
| 7 9 2 | 5 8 3 | 6 4 1 |
|-----------------+-----------------+-----------------|
| 126 4 156 | 3 25 9 | 8 7 256 |
| 239 8 59* | 4 7 6 | 1 *29 235 |
| 239 56 7 | 8 25 1 | 35 269 4 |
+-----------------------------------------------------+
# 35 eliminations remain
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Last edited by daj95376 on Fri Apr 24, 2009 8:50 pm; edited 1 time in total |
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gindaani
Joined: 06 Mar 2009
Posts: 79
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| Posted: Fri Apr 17, 2009 6:25 pm Post subject: |
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After the basics:
| Code: |
+----------------+--------------+--------------+
| 8 16 169 | 1269 4 7 | 35 126 35 |
| 1679 167 3 | 1269 12 5 | 4 8 26 |
| 5 2 4 | 136 13 8 | 7 16 9 |
+----------------+--------------+--------------+
| 16 156 156 | 7 9 4 | 2 3 8 |
| 4 37 8 | 13 6 2 | 9 5 17 |
| 37 9 2 | 5 8 13 | 6 4 17 |
+----------------+--------------+--------------+
| 1236 4 156 | 123 1235 9 | 8 7 2356 |
| 1239 8 159 | 4 7 6 | 135 29 235 |
| 12369 1356 7 | 8 1235 13 | 135 269 4 |
+----------------+--------------+--------------+
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Play this puzzle online at the Daily Sudoku site
I needed four moves beyond the basics to solve.
| Quote: | 3 skyscraper
261 xy-wing
69-92-26-62-29-95-56
6 skyscraper
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Apr 23, 2009 12:08 am Post subject: |
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An enjoyable three-stepper.
Coloring (3), XY-Wing (261) and W-Wing (29) with pincer transport. |
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gindaani
Joined: 06 Mar 2009
Posts: 79
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| Posted: Thu Apr 23, 2009 1:31 am Post subject: |
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I'm guessing your W-Wing (29) with pincer transport is the same as my XY chain 69-92-26-62-29-95-56. The chain resulted in r1c2<>6, r79c1<>6. Is that the same eliminations your W-wing made?
I still needed a skyscraper (6) to finish it after that. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Apr 23, 2009 3:55 am Post subject: |
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| My 29 cells were in r8c8 and r2c4, linked by the 2s in row 1. The 9 was transported from r2c4 to r1c3 via r1c4 and the 9 from r8c3 was eliminated. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Apr 23, 2009 6:37 am Post subject: |
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gindaani,
that is a nice xy-chain.
if you were at all curious, FWIW the chain can be shortened.
(6=2)r1c8 - (2=9)r8c8 - (9=5)r8c2 - (5=6)r9c2 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Thu Apr 23, 2009 2:03 pm Post subject: |
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A slightly different, but similar three stepper:
skyscraper 2,
skyscraper 3,
w-wing 29 at r2c4 & r8c8 with strong link 2 in box3 and 9 at r8c8 transported to r9c1 via r9c8.
Ted |
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gindaani
Joined: 06 Mar 2009
Posts: 79
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| Posted: Thu Apr 23, 2009 3:33 pm Post subject: |
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| storm_norm wrote: | if you were at all curious, FWIW the chain can be shortened.
(6=2)r1c8 - (2=9)r8c8 - (9=5)r8c2 - (5=6)r9c2 |
The shorter chain does not eliminate 6 from r7c1, which is necessary to set up the skyscraper (6) to solve the puzzle. With the shorter chain, I needed at least 1 extra step.
| Marty R. wrote: | | My 29 cells were in r8c8 and r2c4, ... to r1c3 via r1c4 and the 9 from r8c3 was eliminated. |
That's a really nice move!
It can be stated in Eureka as:
(9=2)r8c8 - (2)r1c8 = (2)r1c4 - (2=9)r2c4 - (9)r1c4 = (9)r1c3
That could be shortened to the chain:
(9=2)r8c8 - (2)r1c8 = (2-9)r1c4 = (9)r1c3 |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Apr 23, 2009 6:20 pm Post subject: |
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| Quote: | | The shorter chain does not eliminate 6 from r7c1 |
I have to stop staying up so late.
for some unknown reason my brain tried telling me that the 6 you were eliminating was in box 1...  |
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