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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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 Posted: Sat Jun 12, 2010 10:46 pm Post subject: Jun 13 VH |
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| W-Wing 48 with strong link 4 in row 9 removes the 8's in r5c2 and r3c1 solving the puzzle. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Jun 13, 2010 1:15 am Post subject: |
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| That was my solution, but with different strong links (column 3). Nevertheless, I didn't notice the step that's built into the puzzle solution, although I didn't look for X-Wings. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Jun 13, 2010 1:45 am Post subject: |
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Here are a couple of other less frequent one steppers............
Type 6 UR68 in r16c56. To prevent the deadly pattern r1c5=4 or r6c6=7. If r6c6=7 then r4c6=3, then r4c4=4 [or as a chain; (7)r6c6 - (7=3)r4c6 - (3=4)r4c4].
Thus the two pincers on (4) in r1c5 and r4c4 delete (4) in r4c5 to complete the puzzle.
Another fun step is a flightless xyz-wing 348 in r3c1
If r3c1=3 then r9c1=4, then r6c1<>4, then r6c3=4, then r13c3<>4
If r3c1=4 then r13c3<>4
If r3c1=8 then r2c2=4, then r13c3<>3
Thus all three implications of the xyz-wing force r13c3<>4 to complete the puzzle
Ted |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Jun 13, 2010 2:53 pm Post subject: |
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After basics: | Code: | +----------------+----------------+----------------+
| 1 3478 2467 | 9 468 68 | 5 2367 348 |
| 5 48 26 | 7 3 1 | 9 26 48 |
| 348 9 467 | 468 2 5 | 678 367 1 |
+----------------+----------------+----------------+
| 9 2 5 | 34 14 37 | 17 8 6 |
| 6 78 3 | 5 18 9 | 4 17 2 |
| 48 1 47 | 2 68 678 | 3 9 5 |
+----------------+----------------+----------------+
| 7 36 9 | 1 5 368 | 2 4 38 |
| 2 356 1 | 368 7 4 | 68 356 9 |
| 34 3456 8 | 36 9 2 | 16 1356 7 |
+----------------+----------------+----------------+ |
Either an X-wing on 8 or an XY-wing -478 will solve it in one step. The 3-68 XY-wing is not much use.
Keith |
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roaa
Joined: 18 Apr 2009
Posts: 112
Location: Sweden
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| Posted: Sun Jun 13, 2010 8:03 pm Post subject: |
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| One shot solution: xy-wing 478 forces r6c3 = 4 and so on. |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Mon Jun 14, 2010 3:14 pm Post subject: |
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| Colouring on 7. |
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