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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Mar 13, 2010 11:53 am Post subject: Puzzle 10/03/13 Advanced |
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| Code: | +-----------------------+
| 8 . 4 | . 5 7 | . . . |
| . . . | . . . | . . . |
| 7 . 3 | 2 . 6 | . . . |
|-------+-------+-------|
| . . 5 | 3 . . | 2 . 7 |
| 3 . . | . . 2 | 6 8 . |
| 6 . 7 | . 4 . | . . 5 |
|-------+-------+-------|
| . . . | 6 2 . | 1 . . |
| . . . | . 3 . | . 2 . |
| . . . | 7 . 1 | . . 3 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sun Mar 14, 2010 12:29 am Post subject: |
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| Quote: | after
skyscraper 1
kite 4
xyz-wing 168 |
| Code: | +----------------+-------------+--------------------+
| 8 16 4 | 9 5 7 | 3 (16) 2 |
| 259 1569 269 | 4 (18) 3 | 7 569 (168) |
| 7 159 3 | 2 (18) 6 | 458 159-4 (481) |
+----------------+-------------+--------------------+
| 14 8 5 | 3 6 9 | 2 (14) 7 |
| 3 49 19 | 5 7 2 | 6 8 1-4 |
| 6 2 7 | 1 4 8 | 9 3 5 |
+----------------+-------------+--------------------+
| 459 3 89 | 6 2 45 | 1 7 489 |
| 19 7 169 | 8 3 45 | 45 2 69 |
| 245 456 268 | 7 9 1 | 458 56 3 |
+----------------+-------------+--------------------+ |
because of the strong links on 8 in the UR 18, r23c49, the 1 in r3c9 is already eliminated.
but ignoring that
the UR provides a xy-wing{46}r23c9, {16}r1c8, {14}r4c8
eliminates the 4 in r5c9 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Mar 14, 2010 9:40 pm Post subject: |
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| While looking to see what could be done with the 18 UR, I noticed that the DP killer was either a 4 or 6 in r23c9. This pseudo cell served as the pivot of a 461 XY-Wing, which was all that was needed. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Sun Mar 14, 2010 9:47 pm Post subject: |
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Nice find Marty! I used two steps: | Code: | *-----------------------------------------------------------*
| 8 16 4 | 9 5 7 | 3 16 2 |
| 1259 1569 1269 | 4 18 3 | 7 1569 168 |
| 7 159 3 | 2 18 6 | 458 1459 148 |
|-------------------+-------------------+-------------------|
| 14 8 5 | 3 6 9 | 2 14 7 |
| 3 149 19 | 5 7 2 | 6 8 14 |
| 6 2 7 | 1 4 8 | 9 3 5 |
|-------------------+-------------------+-------------------|
| 459 3 89 | 6 2 45 | 1 7 489 |
| 19 7 169 | 8 3 45 | 45 2 69 |
| 245 456 268 | 7 9 1 | 458 456 3 |
*-----------------------------------------------------------*
(9)r7c9=(9-6)r8c9=r2c9-(6=1)r1c8-r4c8=r4c1-(1=9)r8c1; r7c13,r8c9<>9
ur 18 r23c59; r3c9=4
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