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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Sep 24, 2010 3:54 am Post subject: Puzzle 10/09/24: B |
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| Code: | +-----------------------+
| 7 . 1 | . 3 . | 6 . . |
| . 6 . | . 2 . | 3 . . |
| 8 . 3 | 4 6 . | 2 7 . |
|-------+-------+-------|
| . . 5 | 3 1 . | 8 . . |
| 1 3 8 | 7 5 . | 4 2 . |
| . . . | . . 8 | . 1 . |
|-------+-------+-------|
| 5 8 9 | 2 7 . | 1 . . |
| . . 2 | . 9 3 | . . . |
| . . . | . . . | . . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Fri Sep 24, 2010 9:46 am Post subject: |
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| Quote: | Kite (6)C1R6 : => r8c4<>6
X Wings (6)C34 : => r9c68<>6
X Wing (9)R35 : r1c69<>9
XY Wing (14-5), pivot at R9C6 : r8c89,r9c4<>5 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Sep 24, 2010 10:00 pm Post subject: |
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A heavy use of xy-wings did the deed.......
| Quote: | Flightless xy-wing-149 Vertex (49)r4c2: (1=4)r8c2-(4=9)r4c2-r4c8=r5c9-(9=1)r3c9-r3c6=(1)r2c4; r8c4<>1
Flightless xy-wing 4-56 vertex (46)r8c1: (5=6)r8c4-(6=4)r8c1-(4=6)r4c1-(6=9)r4c8-r5c9=r5c6-(9=5)r1c6; r12c4,r9c6<>5
xy-wing found by extending the vertex of a potential xy-wing 56-9: (9=6)r6c4-(6=5)r8c4-r9c4=r9c8-(5=8)r2c8-(8=1)r2c4-(1=9)r3c6; r1c4,r5c6<>9
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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: Sat Sep 25, 2010 2:54 pm Post subject: |
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I did it three times.
1) DP 56 boxes 89, r89c4<>1 due to invalidity
2) DP 58 boxes 39, DP killers force numerous common eliminations
3) A few colorings in 6 and 9 followed by an X-Wing on 6 and two XY-Wings |
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