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dext100
Joined: 13 Nov 2005
Posts: 6
Location: Salem, MA
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 Posted: Thu Feb 12, 2009 1:05 am Post subject: Stuck!! |
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I am stuck at this point and have no clue what my next move should be. Any suggestions??
| Code: |
+-------------+---------------+--------------+
| 29 4789 24 | 4579 68 3 | 26 1 579 |
| 5 3789 23 | 79 68 1 | 26 379 4 |
| 1 3479 6 | 4579 579 2 | 8 3579 579 |
+-------------+---------------+--------------+
| 6 1 8 | 2 579 579 | 4 579 3 |
| 29 359 235 | 1 4 6 | 579 579 8 |
| 4 59 7 | 3 59 8 | 1 6 2 |
+-------------+---------------+--------------+
| 3 45 9 | 6 2 457 | 57 8 1 |
| 8 6 45 | 579 1 4579 | 3 2 579 |
| 7 2 1 | 8 3 59 | 59 4 6 |
+-------------+---------------+--------------+
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Play this puzzle online at the Daily Sudoku site[/img] |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Feb 12, 2009 1:23 am Post subject: |
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dext100,
you missed an intersection on row 4, on candidate 7
see where the 7's can go in row 4. I think you can see that one can be eliminated.
that should bring you to the end of basics.
| Code: | .------------------.------------------.------------------.
| 29 4789 24 | 4579 68 3 | 26 1 579 |
| 5 3789 23 | 79 68 1 | 26 379 4 |
| 1 3479 6 | 4579 579 2 | 8 3579 579 |
:------------------+------------------+------------------:
| 6 1 8 | 2 579 579 | 4 59 3 |
| 29 359 235 | 1 4 6 | 579 579 8 |
| 4 59 7 | 3 59 8 | 1 6 2 |
:------------------+------------------+------------------:
| 3 45 9 | 6 2 457 | 57 8 1 |
| 8 6 45 | 579 1 4579 | 3 2 579 |
| 7 2 1 | 8 3 59 | 59 4 6 |
'------------------'------------------'------------------' |
just at a glance,
if you are familiar with W-wings, there is a nice one available
then...
the puzzle get interesting after that. |
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dext100
Joined: 13 Nov 2005
Posts: 6
Location: Salem, MA
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| Posted: Thu Feb 12, 2009 1:49 am Post subject: W-wings |
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Thanks storm_norm for the quick reply. I actually was at that point you refered to. My error on my post.  I would appreciate some additional help at this point now that one 7 has been eliminated from row 4. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Feb 12, 2009 2:07 am Post subject: Re: W-wings |
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| dext100 wrote: | | Thanks storm_norm for the quick reply. I actually was at that point you refered to. My error on my post. I would appreciate some additional help at this point now that one 7 has been eliminated from row 4. |
no worries, sometimes I edit several times.
| Code: | .------------------.------------------.------------------.
| 29 4789 24 | 4579 68 3 | 26 1 579 |
| 5 3789 23 | 79 68 1 | 26 379 4 |
| 1 3479 6 | 4579 579 2 | 8 3579 579 |
:------------------+------------------+------------------:
| 6 1 8 | 2 579 -579 | 4 W[59] 3 |
| 29 359 235 | 1 4 6 |W57[9] 579 8 |
| 4 59 7 | 3 59 8 | 1 6 2 |
:------------------+------------------+------------------:
| 3 45 9 | 6 2 457 | 57 8 1 |
| 8 6 45 | 579 1 4579 | 3 2 579 |
| 7 2 1 | 8 3 W[59] |W5[9] 4 6 |
'------------------'------------------'------------------' |
can you see the w-wing I have marked in the grid?
w-wing on {5,9} says that 5 can be eliminated from row 4 column 6
in a w-wing, the two identical bi-value cells are connected via a pair of conjugate candidates. in this case the 9's in column 7 are conjugate and see the {5,9} cell in r4c8 and the {5,9} cell in r9c6.
when this happens, the opposite candidate in each bivalue cell acts like a pincer and eliminates any 5's they see.
the 5 in r4c6 is seen by both. |
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