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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Mon Jul 05, 2010 10:37 pm Post subject: Puzzle 10/07/05: unrated |
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| Code: | +-----------------------+
| . 9 . | . 6 . | . . . |
| 6 . 3 | . . 9 | . 4 . |
| . 7 . | 8 . . | . 9 3 |
|-------+-------+-------|
| . . . | 5 . . | . . . |
| 1 . . | . . 6 | . . 5 |
| . 5 . | . 1 8 | . 2 . |
|-------+-------+-------|
| . 3 . | . . . | . 5 2 |
| . 1 2 | . 5 7 | 3 . . |
| . . 9 | . 3 . | 7 . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
| Code: | after basics
+-----------------------------------------------------------------------+
| 4 9 15 | 137 6 135 | 2 178 178 |
| 6 8 3 | 127 27 9 | 5 4 17 |
| 2 7 15 | 8 4 15 | 6 9 3 |
|-----------------------+-----------------------+-----------------------|
| 39 246 4678 | 5 279 234 | 1489 137 14679 |
| 1 24 478 | 2347 279 6 | 489 37 5 |
| 39 5 467 | 347 1 8 | 49 2 4679 |
|-----------------------+-----------------------+-----------------------|
| 7 3 46 | 1469 8 14 | 149 5 2 |
| 8 1 2 | 49 5 7 | 3 6 49 |
| 5 46 9 | 1246 3 124 | 7 18 148 |
+-----------------------------------------------------------------------+
# 72 eliminations remain
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue Jul 06, 2010 12:35 pm Post subject: |
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Danny,
Not having a rating for this puzzle added to the fun. I did not realize how the rating has influenced my approach to solving your puzzles.
Here is my assortment of fun steps.........
| Quote: | Type 1 UR15 r13c36; r1c6=3
ANP(18=4)r9c89-r8c9=r8c4-(4=1)r7c6; r7c7,r9c6<>1
Type 1 UR18 r19c89; r1c9=7
Remote Pairs 49 r8c4 =>r6c7; r6c4<>4
w-wing 37 r4c8 & r6c4 strong link 3 r46c1; r4c5<>7 |
I suspect that one or two are not necessary.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Jul 06, 2010 11:06 pm Post subject: |
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| I'm not proud of my solution. First I played the Type 1 UR on 15, then I looked at the implications of the potential Type 6 UR on 17 and discovered that r2c4=2 solved the puzzle. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue Jul 06, 2010 11:29 pm Post subject: |
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| Marty R. wrote: | | I'm not proud of my solution. |
Marty,
Enjoying your solution does not necessarily mean that you are proud of it; but fun is still fun!
Besides, your solution is clearly shorter and cleaner that the one I posted..............
Ted |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Tue Jul 06, 2010 11:56 pm Post subject: |
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Marty: Given my solver's solution, your solution turns out to be a wise choice.
| Code: | r13c36 <15> UR Type 1.2223 r1c6<>15
<69+4> XYZ-Wing r7c4/r7c3+r8c4 <> 4 r7c6
r19c89 <18> UR Type 1.2223 r1c9<>18
r12c49 <17> UR Type 1.1112 *** r2c4<>7
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Here is the grid before the final URs:
| Code: | *-----------------------------------------------------------*
| 4 9 5 | 17 6 3 | 2 18 178 |
| 6 8 3 | 127 27 9 | 5 4 17 |
| 2 7 1 | 8 4 5 | 6 9 3 |
|-------------------+-------------------+-------------------|
| 39 246 8 | 5 27 24 | 1 37 469 |
| 1 24 47 | 2347 9 6 | 8 37 5 |
| 39 5 467 | 347 1 8 | 49 2 469 |
|-------------------+-------------------+-------------------|
| 7 3 46 | 469 8 1 | 49 5 2 |
| 8 1 2 | 49 5 7 | 3 6 49 |
| 5 46 9 | 246 3 24 | 7 18 18 |
*-----------------------------------------------------------*
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The <18> UR says that r1c9=7 must occur.
The <17> UR says that r1c9=8 and/or r2c4=2 must occur.
Combining the two UR constraints leads to r1c9=7 and r2c4=2.
We won't even consider the <46> DP pattern in bands 2 & 3 !!!
Last edited by daj95376 on Wed Jul 07, 2010 12:03 am; edited 1 time in total |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Jul 07, 2010 12:01 am Post subject: |
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| Quote: | | Marty: Given my solver's solution, your solution turns out to be a wise choice. |
Well, mine wasn't so wise. My grid didn't have the 18 UR as a Type 1, so I wasn't able to make the conclusion about r1c9. Mine felt too much like T&E. |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Wed Jul 07, 2010 12:52 am Post subject: |
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| What Ted said. Nice solution Marty. |
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