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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sun Aug 29, 2010 4:40 pm Post subject: Puzzle 10/08/29: A |
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| Code: | +-----------------------+
| . 7 . | . . 1 | . . 2 |
| 8 5 . | . 2 9 | . 7 6 |
| . . . | . 6 . | . 9 . |
|-------+-------+-------|
| . . . | 2 . . | . . 8 |
| . 4 9 | . 8 . | . 2 7 |
| 7 8 . | . . 6 | . . . |
|-------+-------+-------|
| . . . | . . . | . . 5 |
| . 2 7 | . 5 . | . 1 . |
| 5 1 . | 7 9 . | 2 . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Aug 30, 2010 4:53 am Post subject: |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Mon Aug 30, 2010 10:49 pm Post subject: |
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1. A 6-cell ADP (14)r236c379 which I believe is a BUG-Lite
Internal SIS: r2c7=3, r6c7=3, r6c7=5 or r6c9=3
(3)r2c7-(3=4)r2c4-r1c5=r6c5; r6c79<>4
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(3)r6c7-(3=4)r6c5; r6c79<>4
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(5)r6c7-(5=34)ls:r6c58; r6c79<>4
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(3)r6c9-(3=4)r6c5; r6c79<>4
External SIS: r2c4=4 or r46c8=4 ADP(14)r236c379[(4)r46c8=(4)r2c4]-r1c5=(4)r6c5; r6c79<>4
Same results with either approach. Fun but not very useful since the next move results in the same deletions.
2. Type 1 UR (58)r13c47; r1c7<>58
3. How about a 10-cell ADP (34)r12468c45678 which, if valid, I believe is also a BUG-Lite
| Code: |
*--------------------------------------------------*
| 9 7 6 | 58 *34 1 |*34 58 2 |
| 8 5 14 |*34 2 9 |*134 7 6 |
| 2 3 14 | 58 6 7 | 58 9 14 |
|----------------+----------------+----------------|
| 1 6 5 | 2 7 *34 | 9 *34 8 |
| 3 4 9 | 1 8 5 | 6 2 7 |
| 7 8 2 | 9 *34 6 | 15 *345 13 |
|----------------+----------------+----------------|
| 46 9 38 | 46 1 2 | 7 38 5 |
| 46 2 7 |*346 5 *348 | 48 1 9 |
| 5 1 38 | 7 9 48 | 2 6 34 |
*--------------------------------------------------* |
Internal SIS: r2c7=1, r6c8=5, r8c4=6 or r8c6=8
(1)r2c7-(1=4)r2c3-r2c4=r1c5-r6c5=(4)r4c6; r9c6<>4
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(5)r6c8-(5=1)r6c7-(1=3)r6c9-(3=4)r9c9; r9c6<>4
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(6)r8c4-(6=4)r7c4; r9c6<>4
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(8-3)r6c8=r8c4-(3=4)r2c4-(4=1)r2c3-r3c3=(1-4)r3c9=(4)r9c9; r9c6<>4 to complete the puzzle.
This deletion can also be obtained using the external SIS given the number of contradiction paths running through the code.
Ted |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Tue Aug 31, 2010 12:51 am Post subject: |
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| tlanglet wrote: | How about a 10-cell ADP (34)r12468c45678 which, if valid, I believe is also a BUG-Lite
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More examples of Unique loops here ...  But you probably already know them 
JC |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue Aug 31, 2010 12:30 pm Post subject: |
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| JC Van Hay wrote: | | tlanglet wrote: | How about a 10-cell ADP (34)r12468c45678 which, if valid, I believe is also a BUG-Lite
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More examples of Unique loops here ... But you probably already know them
JC |
Thanks JC for the link. I was not aware of this site but will pursue it further.
Ted |
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