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Clement
Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania
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 Posted: Sat Dec 11, 2010 10:11 pm Post subject: Dec 12 VH |
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| XY-Wing 46 69 49 pivoted in r1c9 removing 4 in r3c1 solves it. |
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prakash
Joined: 02 Jan 2008
Posts: 67
Location: New Jersey, USA
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| Posted: Sat Dec 11, 2010 10:58 pm Post subject: |
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| For some reason, even after two tries, I finished it without the need for any advanced techniques. I am baffled. Could someone please post th grid after the basics? |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Dec 12, 2010 4:26 am Post subject: |
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I saw three moves.
1) Type 3 UR (59) with 46 pseudo cell; r6c6<>4
2) W-Wing (49); r1c9<>9
3) XY-Wing (694); r3c1<>4 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Dec 12, 2010 5:44 am Post subject: |
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My post-basics grid:
| Code: |
+-------------+---------------+------------+
| 5 7 46 | 2 49 1 | 8 3 69 |
| 1 9 3 | 8 5 46 | 246 7 26 |
| 46 8 2 | 3469 349 7 | 1 49 5 |
+-------------+---------------+------------+
| 89 34 45 | 49 6 2 | 7 58 1 |
| 89 246 456 | 1 7 3 | 246 58 269 |
| 7 26 1 | 5 8 49 | 26 49 3 |
+-------------+---------------+------------+
| 2 5 9 | 7 1 8 | 3 6 4 |
| 346 46 7 | 3469 2 4569 | 59 1 8 |
| 346 1 8 | 3469 349 4569 | 59 2 7 |
+-------------+---------------+------------+
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Play this puzzle online at the Daily Sudoku site |
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kuskey
Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH
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| Posted: Sun Dec 12, 2010 6:00 am Post subject: Dec 12 VH |
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In addition to those already mentioned, I found the following:
469 xy-wing: r2c89 <>6
469 xy-wing: r1c3 <>6
46 w-wing in c16: r3c4 <>6
46 w-wing in c36: r1c5 <>4 |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sun Dec 12, 2010 10:40 am Post subject: |
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(From Marty's grid) there are also a bunch of turbot/fish moves on 4 that finish it e.g.
| Code: | kite(4) r2, c8 ; r6c6<>4
skyscraper(4) r2, r6 ; r3c8<>4, r5c7<>4 |
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prakash
Joined: 02 Jan 2008
Posts: 67
Location: New Jersey, USA
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| Posted: Sun Dec 12, 2010 3:38 pm Post subject: |
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| A skyscraper in 4s r3c8 <> 4 does the trick as well. I realized I was doing this elimination subconsciously without recognizing it as an advanced move. |
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