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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Tue Jan 19, 2010 12:07 am Post subject: Puzzle 10/01/18 (C) |
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| Code: | +-----------------------+
| 6 . 5 | . 8 . | . . 3 |
| . . . | . 5 6 | 8 . 9 |
| 9 . . | . . 7 | . 6 . |
|-------+-------+-------|
| . . . | . 4 . | . . . |
| 8 2 . | 6 1 9 | 4 . 7 |
| . 9 4 | . 7 8 | . . . |
|-------+-------+-------|
| . 1 . | . 9 . | . . . |
| . . 9 | . . . | . . . |
| 4 3 . | . 6 . | . . 8 |
+-----------------------+
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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: Tue Jan 19, 2010 2:06 pm Post subject: |
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Here is a two stepper with a somewhat different second move (for me at least).
The first move is a w-wing 12 in r1c6 & r9c4 with strong link 2 in r38c5.
This results in the following grid after cleanup including a naked quad or hidden pair 17.
| Code: | *-----------------------------------------------------------*
| 6 47 5 | 9 8 1 | 27 #247 3 |
| 3 47 12 | 24 5 6 | 8 #147 9 |
| 9 8 12 | 234 23 7 | 15 6 45 |
|-------------------+-------------------+-------------------|
| 7 5 6 | 23 4 23 | 9 8 1 |
| 8 2 3 | 6 1 9 | 4 5 7 |
| 1 9 4 | 5 7 8 | 236 23 26 |
|-------------------+-------------------+-------------------|
| 25 1 8 | 7 9 2345 | 2356 234 2456 |
| 25 6 9 | 8 23 2345 | 17 17 245 |
| 4 3 7 | 1 6 25 | 25 9 8 |
*-----------------------------------------------------------*
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Now notice the UR 47 in r12c28. To prevent the deadly pattern, either r1c8=2 or r2c8=1 which forms a pseudocell 12 in r12c8, marked #. This pseudocell becomes a pincer for a xy-wing -127 with the vertex 27 in r1c7 and second pincer 17 in r8c7 to delete the 1 in r3c7 and complete the puzzle.
Ted |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Tue Jan 19, 2010 4:27 pm Post subject: |
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| tlanglet wrote: | Here is a two stepper with a somewhat different second move (for me at least).
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Wow! nice find!  I was stuck with a three stepper -- an xyz-wing sandwiched with a couple of w-wings.
I have started looking for psuedo cells but it hurts my mind.  |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Tue Jan 19, 2010 6:55 pm Post subject: |
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| tlanglet wrote: | Now notice the UR 47 in r12c28. To prevent the deadly pattern, either r1c8=2 or r2c8=1 which forms a pseudocell 12 in r12c8, marked #. This pseudocell becomes a pincer for a xy-wing -127 with the vertex 27 in r1c7 and second pincer 17 in r8c7 to delete the 1 in r3c7 and complete the puzzle.
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I second Dan's Wow!
An impressive way to use what appears to be a useless UR!
Congratulations, Danny
Addendum: Hey Ted, an additional congratulations on using the pseudo-cell properly. It's only "viable" in [b3] and [c8] -- which is how you used it in the XY-Wing. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Jan 20, 2010 11:35 pm Post subject: |
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| I'm not nearly clever enough to spot and use that pseudo cell. But, after playing the 12 W-Wing, I used the 47 UR to finish because both the 1 and 2 that are needed to kill the DP will force r2c8=1. |
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