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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Mar 06, 2009 4:58 pm Post subject: Set N Puzzle 75 |
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| Code: | +-----------------------+
| 3 . . | . . . | . 5 2 |
| . 4 . | . . 5 | 3 . 8 |
| . . . | . 8 9 | . 7 . |
|-------+-------+-------|
| . . . | . . . | 8 . . |
| . . 6 | . 2 . | . . . |
| . 8 5 | . . 1 | . . . |
|-------+-------+-------|
| . 9 . | 6 . . | 5 . . |
| 6 . 3 | . . . | . . 1 |
| 2 5 . | . . . | . 9 3 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Fri Mar 06, 2009 7:10 pm Post subject: |
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| Code: | .------------------------.------------------------.------------------------.
| 3 16 8 | 147 1467 467 | 9 5 2 |
| 79 4 79 | 2 16 5 | 3 16 8 |
| 5 16 2 | 3 8 9 | 14 7 46 |
:------------------------+------------------------+------------------------:
| 1479 2 79 | 4579 345679 *3467 | 8 *1346 4569 |
| 1479 3 6 | 45789 2 478 | 147 14 459 |
| 479 8 5 | 479 34679 1 | 247 *2346 469 |
:------------------------+------------------------+------------------------:
| 8 9 14 | 6 134 *234 | 5 *24 7 |
| 6 7 3 | 59 59 *2-4 |*24 8 1 |
| 2 5 14 | 1478 147 478 | 6 9 3 |
'------------------------'------------------------'------------------------' |
these puzzles are nice for the VH tech's required. unless one non-VH tech can do it, like this:
(4=2)r8c7 - (2)r7c8 = (2-3)r6c8 = (3)r4c8 - (3)r4c6 = (3-2)r7c6 = (2)r7c6; r7c6 <> 4 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Mar 07, 2009 1:22 am Post subject: |
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Well, I practiced my VH techniques, and practiced, and practiced; eight times 
I have to believe that some steps did not directly contribute to the solution, but they were still fun. Thanks Danny for another BBDB.
Initially, I had to scratch for random deletions but later choices appeared. In random order, I had an ER, four URs of various types, two w-wings, x-wing, and a couple of transports.
Ted |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Mar 07, 2009 1:38 am Post subject: |
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| storm_norm wrote: | | Code: | .------------------------.------------------------.------------------------.
| 3 16 8 | 147 1467 467 | 9 5 2 |
| 79 4 79 | 2 16 5 | 3 16 8 |
| 5 16 2 | 3 8 9 | 14 7 46 |
:------------------------+------------------------+------------------------:
| 1479 2 79 | 4579 345679 *3467 | 8 *1346 4569 |
| 1479 3 6 | 45789 2 478 | 147 14 459 |
| 479 8 5 | 479 34679 1 | 247 *2346 469 |
:------------------------+------------------------+------------------------:
| 8 9 14 | 6 134 *234 | 5 *24 7 |
| 6 7 3 | 59 59 *2-4 |*24 8 1 |
| 2 5 14 | 1478 147 478 | 6 9 3 |
'------------------------'------------------------'------------------------' |
these puzzles are nice for the VH tech's required. unless one non-VH tech can do it, like this:
(4=2)r8c7 - (2)r7c8 = (2-3)r6c8 = (3)r4c8 - (3)r4c6 = (3-2)r7c6 = (2)r7c6; r7c6 <> 4 |
Marty, I followed your chain until the last step. Did you mean
(4=2)r8c7 - (2)r7c8 = (2-3)r6c8 = (3)r4c8 - (3)r4c6 = (3-2)r7c6 = (2)r8c6, or did I "read" the notation incorrectly? Also, does you chain really state that r8c7<>2?
Ted
P.S. Great chain..... |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sat Mar 07, 2009 1:56 am Post subject: |
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| storm_norm wrote: | | Code: | .------------------------.------------------------.------------------------.
| 3 16 8 | 147 1467 467 | 9 5 2 |
| 79 4 79 | 2 16 5 | 3 16 8 |
| 5 16 2 | 3 8 9 | 14 7 46 |
:------------------------+------------------------+------------------------:
| 1479 2 79 | 4579 345679 *3467 | 8 *1346 4569 |
| 1479 3 6 | 45789 2 478 | 147 14 459 |
| 479 8 5 | 479 34679 1 | 247 *2346 469 |
:------------------------+------------------------+------------------------:
| 8 9 14 | 6 134 *234 | 5 *24 7 |
| 6 7 3 | 59 59 *2-4 |*24 8 1 |
| 2 5 14 | 1478 147 478 | 6 9 3 |
'------------------------'------------------------'------------------------' |
these puzzles are nice for the VH tech's required. unless one non-VH tech can do it, like this:
(4=2)r8c7 - (2)r7c8 = (2-3)r6c8 = (3)r4c8 - (3)r4c6 = (3-2)r7c6 = (2)r8c6; r8c6 <> 4 |
Ted: I believe this is Norm's correct chain and elimination.
For clarity, think of it as starting with an assertion and ending with a contradiction. This works well when there is a single elimination.
(4)r8c6 - (4=2)r8c7 - (2)r7c8 = (2-3)r6c8 = (3)r4c8 - (3)r4c6 = (3-2)r7c6 = (2)r8c6; r8c6 <> 4 |
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