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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Jul 24, 2009 4:18 pm Post subject: Set XY_03 Puzzle 028 |
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| Code: | +-----------------------+
| 8 . . | . 2 . | . 7 . |
| . 7 . | . . . | . 4 3 |
| . . . | 4 . . | . . . |
|-------+-------+-------|
| . . 8 | 6 5 . | 7 . 9 |
| 1 . . | 3 9 . | . 8 . |
| . . . | . . 2 | . . . |
|-------+-------+-------|
| . . . | 7 . . | 8 9 . |
| 3 9 . | . 1 . | 4 5 7 |
| . 8 . | 9 . . | . 3 1 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
| You May Need wrote: | | [r5c7],[r7c3]<>2 ... to get around the advanced fish |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Jul 24, 2009 10:13 pm Post subject: |
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One step that involves a | Quote: | w-wing 26 with a "different" strong link. The w-wing is in r3c8 and r7c9. The "different" strong link 2 is in col2 which also contains a third occurrence of the digit 2 in r5c2. However, (2)r5c2 - (2)r5c79 = (2)r4c8 - (2=6)r3c8 so the w-wing is valid and deletes the 6 in r1c9 to complete the puzzle. Is this a grouped strong link?
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Does anyone have the proper terminology for this condition?
Ted |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sat Jul 25, 2009 1:30 am Post subject: |
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Ted,
may we know all the cells that contain your original w-wing? then maybe we can go from there
or
are you referring to ONLY the identical bi-value cells {2,6} in r3c8 and r7c9 as a w-wing? without the strong link needed to connect them?
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after further examination, I found the NET that you are seeing. others would post this type of NET as follows.
Net on the 2's in column two. present as a Kraken column:
(2)r3c2 - (2=6)r3c8
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(2)r5c2 - (2)r5c79 = (2)r5c8 - (2=6)r2c8
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(2)r7c2 - (2=6)r7c9
each of which conclude with eliminating 6 from r1c9 |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sat Jul 25, 2009 3:45 am Post subject: |
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| Code: | .---------------------.---------------------.---------------------.
| 8 1456 13459 | 15 2 1369 | 1569 7 56 |
| 2569 7 1259 | 158 68 169 | 12569 4 3 |
| 2569 1256 12359 | 4 367 13679 | 12569 26 8 |
:---------------------+---------------------+---------------------:
| 24 3 8 | 6 5 14 | 7 12 9 |
| 1 2456 2457 | 3 9 47 | 256 8 2456 |
| 45679 456 4579 | 18 478 2 | 3 16 456 |
:---------------------+---------------------+---------------------:
| 245 1245 1245 | 7 346 3456 | 8 9 26 |
| 3 9 6 | 2 1 8 | 4 5 7 |
| 2457 8 2457 | 9 46 456 | 26 3 1 |
'---------------------'---------------------'---------------------' |
(2=1)r4c7 - (1)r6c8 = (1)r6c4 - (1=5)r1c4 - (5=6)r1c9 - (6=2)r7c9; r5c2 <> 2
some singles.
(5=2)r5c7 - (5)r5c2 = (2)r3c2 - (2=6)r3c8 - (6=5)r1c9; r56c9 <> 5 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sat Jul 25, 2009 2:59 pm Post subject: |
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Ted, I don't recall seeing your pattern, so I don't know if it has a name.
If it wasn't for the fin cell (#), you would have a W-Wing w/pincer cells (*) and a strong link (@) in [c2]. I guess it could be called a Kraken W-Wing since the fin cell forces the same elimination as the W-Wing.
| Code: | *--------------------------------------------------------------------*
| 8 1456 13459 | 15 2 1369 | 1569 7 56 |
| 2569 7 1259 | 158 68 169 | 12569 4 3 |
| 2569 @1256 12359 | 4 367 13679 | 12569 *26 8 |
|----------------------+----------------------+----------------------|
| 24 3 8 | 6 5 14 | 7 12 9 |
| 1 #2456 2457 | 3 9 47 | 256 8 2456 |
| 45679 456 4579 | 18 478 2 | 3 16 456 |
|----------------------+----------------------+----------------------|
| 245 @1245 1245 | 7 346 3456 | 8 9 *26 |
| 3 9 6 | 2 1 8 | 4 5 7 |
| 2457 8 2457 | 9 46 456 | 26 3 1 |
*--------------------------------------------------------------------*
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As for Norm's Kraken column, it's a forcing chain w/three streams based on the three possibilities for <2> in [c2]. It's not a forcing network because none of the stream links use information passed down (memory) from an earlier elimination. |
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