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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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 Posted: Tue Jul 02, 2013 11:00 am Post subject: Requires One Advanced Move July 2, 2013 |
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| Code: | *-----------*
|..1|3..|.6.|
|..3|2..|.5.|
|92.|...|...|
|---+---+---|
|.8.|56.|...|
|..2|...|8..|
|...|.84|.7.|
|---+---+---|
|...|...|.47|
|.1.|..9|6..|
|.4.|..7|3..|
*-----------*
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Play/Print this puzzle online |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue Jul 02, 2013 9:53 pm Post subject: |
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| Code: | *-----------------------------------------------------------*
| 5 7 1 | 3 49 8 | 249 6 249 |
| 8 6 3 | 2 49 1 | 7 5 49 |
| 9 2 4 | 67 57 56 | 1 38 38 |
|-------------------+-------------------+-------------------|
|a17 8 a79 | 5 6 2 | 49 *139 1349 |
| 4 5 2 | 179 17 3 | 8 e19 6 |
| 136 39 69 | 19 8 4 | 25 7 25 |
|-------------------+-------------------+-------------------|
| 236 c39 b5689 | 168 1235 56 |d59 4 7 |
| 237 1 578 | 4 235 9 | 6 28 58 |
| 26 4 b5689 | 68 25 7 | 3 *f1289 -1589 |
*-----------------------------------------------------------*
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The easy solution is the Type 1 UR( 49)r12c59 => r1c9=2 but it is usually not considered "advanced"
A messy solution (which may also not be considered advanced) involving multiple paths is:
1r9c8=1r4c8 (Nodes *)
1r4c8-(1=79)r4c13-9r79c3=9r7c2 => r7c7<9> r9c8<>9* (Nodes e-f)
In box9, r7c7*| r9c8* <9> r9c9=9
Thus if r4c8=1 =>r9c9=9
So to restate the original strong inference
1r9c8 =1r4c8 => r9c9<>1 to 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 Jul 02, 2013 10:12 pm Post subject: |
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| tlanglet wrote: | The easy solution is the Type 1 UR( 49)r12c59 => r1c9=2 but it is usually not considered "advanced"
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Sorry I did not define "Advanced". To me advanced is anything other than Locked Cells and Locked Sets. UR (unique rectangle) is advanced.
| Code: | *-----------------------------------------------------------*
| 5 7 1 | 3 *49 8 | 249 6 2-49 |
| 8 6 3 | 2 *49 1 | 7 5 *49 |
| 9 2 4 | 67 57 56 | 1 38 38 |
|-------------------+-------------------+-------------------|
| 17 8 79 | 5 6 2 | 49 139 1349 |
| 4 5 2 | 179 17 3 | 8 19 6 |
| 136 39 69 | 19 8 4 | 25 7 25 |
|-------------------+-------------------+-------------------|
| 236 39 5689 | 168 1235 56 | 59 4 7 |
| 237 1 578 | 4 235 9 | 6 28 58 |
| 26 4 5689 | 68 25 7 | 3 1289 1589 |
*-----------------------------------------------------------*
Unique Rectangle |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Jul 03, 2013 1:32 am Post subject: |
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| A Type 1 UR is advanced, by definition, but not advanced. However, I wasn't too proud to use it. I struggled with this because for a long time I didn't spot the 1349 quad in box 6. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Jul 03, 2013 2:36 am Post subject: |
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Interesting puzzle in the UR is the only standard advance move that will solve it.
I am publishing these "easier" puzzles trying to attract the players that do the regular daily puzzles and would like something more challenging. I am open to suggestions on the level of puzzle needed.
I am going to try to stay away from chains and Eureka notation. |
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