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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Nov 14, 2009 7:15 pm Post subject: Puzzle NR 09/11/14 (A) |
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| Code: | +-----------------------+
| 6 8 9 | 7 2 . | . . . |
| 7 . . | 8 6 . | 9 4 . |
| 3 . . | . . 5 | . . . |
|-------+-------+-------|
| 9 7 . | . . 8 | . 2 4 |
| 8 2 . | . 7 . | . . . |
| . . 4 | 2 . . | . . . |
|-------+-------+-------|
| . 6 . | . . . | 8 5 . |
| . 3 . | 6 . . | 4 9 . |
| . . . | 5 . . | . . 6 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Nov 15, 2009 5:50 pm Post subject: |
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I only used three steps, but lots of fun..........
| Quote: | xy-wing 13-9 with vertex in r4c4, which opens up a
Type 6 UR17 in r78c39. To prevent the deadly pattern either r8c3=5 or r7c9=3
(5)r8c3 - (5=1)r2c3 - (1=7)r7c3
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(3)r7c9 - (3=1)r7c4 - (1=7)r7c3
thus r7c3=7 which opens up a
a Type 1 six cell DP 15 in r2c23, r5c12, r8c13 that forces r8c1=2 to complete the puzzle.
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Ted  |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Nov 16, 2009 12:11 am Post subject: |
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| I also used the 139 XY-Wing as my first move. Next was another XY-Wing, on 341. Either of two moves made the same eliminations and finished the puzzle: an M-Wing on 13 or coloring on 3. |
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