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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Tue Dec 02, 2008 4:40 am Post subject: Set D Puzzle 3 |
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Swordfish Alert.
| Code: | +-----------------------+
| 1 8 . | . . . | 5 7 . |
| 3 5 . | . 8 . | 2 . 6 |
| . . . | . . . | . . 8 |
|-------+-------+-------|
| . . . | . . . | . . . |
| . 3 . | . . 5 | 8 2 . |
| . . . | . 2 3 | 1 . 5 |
|-------+-------+-------|
| 9 2 . | . 5 8 | 4 . 1 |
| 5 . . | . 9 . | . . . |
| . 4 8 | . . 2 | 7 . . |
+-----------------------+
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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: Tue Dec 02, 2008 7:03 am Post subject: |
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| Code: | .---------------------.---------------------.---------------------.
| 1 8 69 | 2 34 69 | 5 7 34 |
| 3 5 479 | 1479 8 1479 | 2 149 6 |
| 47 679 2 | 5 347 14679 | 39 1349 8 |
:---------------------+---------------------+---------------------:
| 2 1679 5 | 8 47 1479 | 369 3469 347 |
| 47 3 19 | 19 6 5 | 8 2 47 |
| 8 679 4679 | 479 2 3 | 1 469 5 |
:---------------------+---------------------+---------------------:
| 9 2 37 | 67 5 8 | 4 36 1 |
| 5 17 137 | 467 9 47 | 36 8 2 |
| 6 4 8 | 3 1 2 | 7 5 9 |
'---------------------'---------------------'---------------------' |
that swordfish alert is also a DP alert for {4,7}, but the common candiate 3 in r3c5 and r4c9 don't really make any interesting inferences? do they?
| Quote: | | w-wing on {4,7} removes 7 from r4c9 |
leaves...
| Code: | .------------------.------------------.------------------.
| 1 8 #69 | 2 34 #69 | 5 7 34 |
| 3 5 4 |17-9 8 17-9 | 2 #19 6 |
| 7 69 2 | 5 34 #169 | 39 #1349 8 |
:------------------+------------------+------------------:
| 2 169 5 | 8 7 #149 | 369 3469 34 |
| 4 3 #19 |#19 6 5 | 8 2 7 |
| 8 679 679 | 49 2 3 | 1 469 5 |
:------------------+------------------+------------------:
| 9 2 37 | 67 5 8 | 4 36 1 |
| 5 17 137 | 467 9 47 | 36 8 2 |
| 6 4 8 | 3 1 2 | 7 5 9 |
'------------------'------------------'------------------' |
| Quote: | the extended w-wing through kite strong links on 1
(9=1)r2c8 - (1)r3c8 = (1)r3c6 - (1)r4c6 = (1)r5c4 - (1=9) - (9)r1c3 = (9)r1c6; r2c46 <> 6 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Tue Dec 02, 2008 3:24 pm Post subject: |
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| storm_norm wrote: | | that swordfish alert is also a DP alert for {4,7}, but the common candiate 3 in r3c5 and r4c9 don't really make any interesting inferences? do they? |
Nice catch on the DP. My limited experience with DPs couldn't make anything of the conjugate 3s. Maybe someone else will see something.
BTW: I corrected a typo where you wrote r5c9 instead of r4c9. I hope this is acceptable. I'm not sure what's acceptable with my expanded capabilities as a forum moderator. I'm open to suggestions on what to do in the future! |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Tue Dec 02, 2008 8:31 pm Post subject: |
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| Quote: | | I corrected a typo where you wrote r5c9 instead of r4c9 |
good catch on your part as well. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Dec 02, 2008 10:27 pm Post subject: |
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| Quote: | | BTW: I corrected a typo where you wrote r5c9 instead of r4c9. I hope this is acceptable. I'm not sure what's acceptable with my expanded capabilities as a forum moderator. I'm open to suggestions on what to do in the future! |
Use your judgment, we have few rules that have been handed down. However, if you edit someone's post, type an explanation at the bottom, such as, "Edited by daj to correct cell number from r5c9 to r4c9." |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Tue Dec 02, 2008 10:34 pm Post subject: |
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| Marty R. wrote: | | Quote: | | BTW: I corrected a typo where you wrote r5c9 instead of r4c9. I hope this is acceptable. I'm not sure what's acceptable with my expanded capabilities as a forum moderator. I'm open to suggestions on what to do in the future! |
Use your judgment, we have few rules that have been handed down. However, if you edit someone's post, type an explanation at the bottom, such as, "Edited by daj to correct cell number from r5c9 to r4c9." |
I like it ...  |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Dec 03, 2008 12:40 am Post subject: |
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| storm_norm wrote: | | Code: | .---------------------.---------------------.---------------------.
| 1 8 69 | 2 34 69 | 5 7 34 |
| 3 5 479 | 1479 8 1479 | 2 149 6 |
| 47 679 2 | 5 347 14679 | 39 1349 8 |
:---------------------+---------------------+---------------------:
| 2 1679 5 | 8 47 1479 | 369 3469 34-7 |
|*47 3 19 | 19 6 5 | 8 2 *47 |
| 8 679 4679 | 479 2 3 | 1 469 5 |
:---------------------+---------------------+---------------------:
| 9 2 37 | 67 5 8 | 4 36 1 |
| 5 17 137 | 467 9 47 | 36 8 2 |
| 6 4 8 | 3 1 2 | 7 5 9 |
'---------------------'---------------------'---------------------'
w-wing on {4,7} removes 7 from r4c9 |
Still struggling with w-wings. Looks like if r4c9<>7 then r5c9=7
Is this right? Can someone show me the logic?
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Dec 03, 2008 12:50 am Post subject: |
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| arkietech wrote: | | storm_norm wrote: | | Code: | .---------------------.---------------------.---------------------.
| 1 8 69 | 2 34 69 | 5 7 34 |
| 3 5 479 | 1479 8 1479 | 2 149 6 |
| 47 679 2 | 5 347 14679 | 39 1349 8 |
:---------------------+---------------------+---------------------:
| 2 1679 5 | 8 47 1479 | 369 3469 34-7 |
|*47 3 19 | 19 6 5 | 8 2 *47 |
| 8 679 4679 | 479 2 3 | 1 469 5 |
:---------------------+---------------------+---------------------:
| 9 2 37 | 67 5 8 | 4 36 1 |
| 5 17 137 | 467 9 47 | 36 8 2 |
| 6 4 8 | 3 1 2 | 7 5 9 |
'---------------------'---------------------'---------------------'
w-wing on {4,7} removes 7 from r4c9 |
Still struggling with w-wings. Looks like if r4c9<>7 then r5c9=7
Is this right? Can someone show me the logic?
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The 47 cells in boxes 56 are connected by the strong link on 4 in row 1. Because of those 4s in row 1, one or the other of the 47 cells must be = 7, thus the pincer situation. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Dec 03, 2008 3:03 am Post subject: |
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| Marty R. wrote: | | arkietech wrote: | | storm_norm wrote: | | Code: | .---------------------.---------------------.---------------------.
| 1 8 69 | 2 34 69 | 5 7 34 |
| 3 5 479 | 1479 8 1479 | 2 149 6 |
| 47 679 2 | 5 347 14679 | 39 1349 8 |
:---------------------+---------------------+---------------------:
| 2 1679 5 | 8 47 1479 | 369 3469 34-7 |
|*47 3 19 | 19 6 5 | 8 2 *47 |
| 8 679 4679 | 479 2 3 | 1 469 5 |
:---------------------+---------------------+---------------------:
| 9 2 37 | 67 5 8 | 4 36 1 |
| 5 17 137 | 467 9 47 | 36 8 2 |
| 6 4 8 | 3 1 2 | 7 5 9 |
'---------------------'---------------------'---------------------'
w-wing on {4,7} removes 7 from r4c9 |
Still struggling with w-wings. Looks like if r4c9<>7 then r5c9=7
Is this right? Can someone show me the logic?
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The 47 cells in boxes 56 are connected by the strong link on 4 in row 1. Because of those 4s in row 1, one or the other of the 47 cells must be = 7, thus the pincer situation. |
Thanks, I was looking at the wrong 47. I have some kind of mental barrier to all this. |
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