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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Fri Mar 19, 2010 4:37 pm Post subject: Free Press Mar 19, 2010 |
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This week, a VH: | Code: | Puzzle: FP031910
+-------+-------+-------+
| 8 . . | . . . | . . . |
| 6 . . | 3 1 9 | . . . |
| . . . | 5 . . | . 9 . |
+-------+-------+-------+
| 3 . 2 | . . . | 8 . . |
| . 9 . | 2 . 5 | . 7 . |
| . . 8 | . . . | . . 4 |
+-------+-------+-------+
| . 6 4 | . . 3 | . . . |
| . . . | 9 2 . | . . 7 |
| . . . | . . . | . . 5 |
+-------+-------+-------+ |
Keith |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Fri Mar 19, 2010 5:20 pm Post subject: |
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| Quote: | I went 3 steps:
1)A UR: r1c57 r3c57 a 6 in r1c7 would create a DP so it is gone leaving only 1 6 in column 7.
2)XY Chain: 1 is eliminated from r8c1 by pincers at r3c1 & r8c6
3)XY Chain: 6 eliminated pincers at r6c6 and r9c5. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Fri Mar 19, 2010 7:11 pm Post subject: |
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| Quote: | | (7=4)r4c6-r4c4=r1c4-(4=7)r3c57-r3c1=r6c1; r4c2,r6c6<>7 stte |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Mar 19, 2010 7:43 pm Post subject: |
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Two VH steps or one ALS move.
| Quote: | xy-wing 1-57 with vertex in r3c1,
another xy-wing 1-47 with vertex again in r3c1, pincer 47 in r2c1 and the other pincer formed by extending the 1 in the vertex: (1)r3c1 - r6c1 = r6c4 - (1=4)r4c4; r1cc4<>4 to complete the puzzle.
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A one step ALS 137 (or hidden pair 17) in r3c13 also completes the puzzle.
ALS[(7)r3c13 = (3)r3c3]r3c13 - r89c3 = r9c2 - (3=6)r9c8 - r8c8 = r8c6 - (6=7)r6c6 - (7=15)r68c1 - (1=7)r3c1; r1c2 | r2c3 | r3c257<>7.
Ted |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Fri Mar 19, 2010 7:49 pm Post subject: |
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Two XY-wings will do it.
Keith |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Fri Mar 19, 2010 7:59 pm Post subject: |
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| tlanglet wrote: | Two VH steps or one ALS move.
xy-wing 1-57 with vertex in r3c1,
another xy-wing 1-47 with vertex again in r3c1, pincer 47 in r2c1 and the other pincer formed by extending the 1 in the vertex: (1)r3c1 - r6c1 = r6c4 - (1=4)r4c4; r1cc4<>4 to complete the puzzle.
Ted |
Whats to extend? | Code: | +----------------+----------------+----------------+
| 8 47a 9 |-46 467 2 | 5 1 3 |
| 6 2 5 | 3 1 9 | 7 4 8 |
| 17 1347 137 | 5 47 8 | 6 9 2 |
+----------------+----------------+----------------+
| 3 17b 2 | 14c 9 47 | 8 5 6 |
| 4 9 6 | 2 8 5 | 3 7 1 |
| 17 5 8 | 16 3 67 | 9 2 4 |
+----------------+----------------+----------------+
| 2 6 4 | 7 5 3 | 1 8 9 |
| 5 8 13 | 9 2 16 | 4 36 7 |
| 9 137 137 | 8 46 146 | 2 36 5 |
+----------------+----------------+----------------+ |
Keith |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Mar 19, 2010 8:59 pm Post subject: |
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| keith wrote: | | tlanglet wrote: | Two VH steps or one ALS move.
xy-wing 1-57 with vertex in r3c1,
another xy-wing 1-47 with vertex again in r3c1, pincer 47 in r2c1 and the other pincer formed by extending the 1 in the vertex: (1)r3c1 - r6c1 = r6c4 - (1=4)r4c4; r1cc4<>4 to complete the puzzle.
Ted |
Whats to extend? | Code: | +----------------+----------------+----------------+
| 8 47a 9 |-46 467 2 | 5 1 3 |
| 6 2 5 | 3 1 9 | 7 4 8 |
| 17 1347 137 | 5 47 8 | 6 9 2 |
+----------------+----------------+----------------+
| 3 17b 2 | 14c 9 47 | 8 5 6 |
| 4 9 6 | 2 8 5 | 3 7 1 |
| 17 5 8 | 16 3 67 | 9 2 4 |
+----------------+----------------+----------------+
| 2 6 4 | 7 5 3 | 1 8 9 |
| 5 8 13 | 9 2 16 | 4 36 7 |
| 9 137 137 | 8 46 146 | 2 36 5 |
+----------------+----------------+----------------+ |
Keith |
Your xy-wing is straightforward; it does not need any transports.
However, I started searching for my second step in box 1 and noticed both the 47 in r1c2 and the 17 in r3c1 and then found the extended solution. I simply completed the puzzle before I had the occasion to spot you xy-wing; our search order was different.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Mar 19, 2010 10:22 pm Post subject: |
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| I used the 175 XY-Wing plus pincer transport. Either an XY-Wing (174) or five-cell XY-Chain removes the 4 from r2c4 to finish it off. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Fri Mar 19, 2010 11:33 pm Post subject: |
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Ted,
At least for me, these rectangular XY-wings are very hard to spot.
Keith |
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