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ravel
Joined: 21 Apr 2006
Posts: 536
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 Posted: Mon Mar 10, 2008 2:01 pm Post subject: Another one |
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| Code: | +-------+-------+-------+
| 1 . . | 2 . . | 3 . . |
| . . . | . 4 . | . 5 . |
| . . 6 | . . 7 | . . 2 |
+-------+-------+-------+
| 3 . . | . . . | 8 . . |
| . 5 . | . 7 . | . 4 . |
| . . 8 | . . . | . . 7 |
+-------+-------+-------+
| 8 . . | 9 . . | 1 . . |
| . 6 . | . 5 . | . . . |
| . . 2 | . . 6 | . . 8 |
+-------+-------+-------+ TTHsieh
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>>> play online
Looks harder than it is. |
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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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| Posted: Mon Mar 10, 2008 5:36 pm Post subject: another |
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Tough enough for me to need a hint.
Earl |
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ravel
Joined: 21 Apr 2006
Posts: 536
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| Posted: Mon Mar 10, 2008 6:20 pm Post subject: |
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| Hope there are more nice solutions. I had two "basic advanced" steps, then something like this. |
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Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
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| Posted: Mon Mar 10, 2008 7:08 pm Post subject: |
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I didn't use any DPs.
(1) Skyscraper on <4> in c14
(2) Finned X-Wing on <1> in r39 with fin transported from r9c2 to r5c3 to remove <1> from r5c4.
Then, repeating that trick...
(3) Finned X-Wing on <3> in r67 with fin transported from r7c2 to r2c3 to remove <3> from r2c6.
That did it. |
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Johan
Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
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| Posted: Mon Mar 10, 2008 8:38 pm Post subject: |
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The first step was the [47] UR* in R14C23, which eliminates both <4>'s in R1C2 and R4C2
| Code: | +-------------------------+-------------------------+-------------------------+
| 1 *-[4]79 * 47 | 2 8 5 | 3 6 49 |
| 2 8 39 | 6 4 39 | 7 5 1 |
| 5 349 6 | 13 139 7 | 49 8 2 |
+-------------------------+-------------------------+-------------------------+
| 3 * 12-[4]79 * 47 | 14 6 1249 | 8 129 5 |
| 69 5 19 | 138 7 12389 | 269 4 39 |
| 469 1249 8 | 5 1239 12349 | 269 1239 7 |
+-------------------------+-------------------------+-------------------------+
| 8 34 5 | 9 23 234 | 1 7 6 |
| 79 6 139 | 1378 5 138 | 249 239 349 |
| 479 1349 2 | 1347 13 6 | 5 39 8 |
+-------------------------+-------------------------+-------------------------+ |
The second was the ER <4> in Box 8, that takes out <4> in R6C6, SL* in C1
| Code: | +-------------------------+-------------------------+-------------------------+
| 1 79 47 | 2 8 5 | 3 6 49 |
| 2 8 39 | 6 4 39 | 7 5 1 |
| 5 349 6 | 13 139 7 | 49 8 2 |
+-------------------------+-------------------------+-------------------------+
| 3 1279 47 | 14 6 1249 | 8 129 5 |
| 69 5 19 | 138 7 12389 | 269 4 39 |
|*469 1249 8 | 5 1239 123-49 | 269 1239 7 |
+-------------------------+-------------------------+-------------------------+
| 8 34 5 | 9 er 23 er 234 | 1 7 6 |
| 79 6 139 | 1378 er 5 er 138 | 249 239 349 |
|*479 1349 2 | 1347 13 6 | 5 39 8 |
+-------------------------+-------------------------+-------------------------+ |
The last one was the *Finned X-wing on <1> in R58C36 with a double Fin(F) in R4C6 and R6C6, which eliminates <1> in R5C4
| Code: | +-------------------------+-------------------------+-------------------------+
| 1 7 4 | 2 8 5 | 3 6 9 |
| 2 8 39 | 6 4 39 | 7 5 1 |
| 5 39 6 | 13 139 7 | 4 8 2 |
+-------------------------+-------------------------+-------------------------+
| 3 129 7 | 14 6 F 1249 | 8 129 5 |
| 69 5 * 19 |-[1]8 7 * 1289 | 269 4 3 |
| 469 1249 8 | 5 1239 F 1239 | 269 129 7 |
+-------------------------+-------------------------+-------------------------+
| 8 34 5 | 9 23 234 | 1 7 6 |
| 79 6 * 139 | 1378 5 * 138 | 29 239 4 |
| 479 1349 2 | 1347 13 6 | 5 39 8 |
+-------------------------+-------------------------+-------------------------+ |
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Victor
Joined: 29 Sep 2005
Posts: 207
Location: NI
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| Posted: Fri Mar 14, 2008 7:45 pm Post subject: |
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As is often remarked, there is some luck in sudoku - i.e. a puzzle may turn out to be easy or difficult depending on the order in which you apply techniques. There's a skyscraper in 4s in C14 that leaves:
| Code: |
+--------------+----------------+-----------+
| 1 7 4 | 2 8 5 | 3 6 9 |
| 2 8 39 | 6 4 39 | 7 5 1 |
| 5 39 6 | 13 139 7 | 4 8 2 |
+--------------+----------------+-----------+
| 3 129 7 | 14 6 1249 | 8 129 5 |
| 69 5 19 | 18 7 1289 | 269 4 3 |
| 469 1249 8 | 5 1239 1239 | 269 129 7 |
+--------------+----------------+-----------+
| 8 34 5 | 9 23 234 | 1 7 6 |
| 79 6 139 | 1378 5 138 | 29 239 4 |
| 479 1349 2 | 1347 13 6 | 5 39 8 |
+--------------+----------------+-----------+
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That exposes a UR in 18s in r58c46 that allows elimination of the bottom-right 1, which more or less solves the puzzle.
Faint echos of another puzzle from before Xmas, where if you did a simple colouring move first you killed a UR & made the puzzle very difficult, whereas if you did the UR first it was very easy. (Ravel & others, as I recall, did the UR first, whereas I did the colouring first & found it almost impossible to finish - that's stuck with me.) |
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