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ravel
Joined: 21 Apr 2006
Posts: 536
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 Posted: Tue Apr 22, 2008 7:58 am Post subject: VH by m_b_metcalf |
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Interesting pattern.
| Code: | +-------+-------+-------+
| . 1 3 | . . . | . . 2 |
| 8 . 7 | . . . | . . . |
| 5 9 . | 8 . . | . . . |
+-------+-------+-------+
| . . 9 | . 7 3 | . . . |
| . . . | 2 . 1 | . . . |
| . . . | 6 8 . | 4 . . |
+-------+-------+-------+
| . . . | . . 6 | . 4 1 |
| . . . | . . . | 6 . 7 |
| 4 . . | . . . | 5 9 . |
+-------+-------+-------+ m_b_metcalf
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>>> play online |
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sheryl
Joined: 24 Sep 2007
Posts: 64
Location: New York
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| Posted: Tue Apr 22, 2008 1:54 pm Post subject: |
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| are you going to post any solutions? i can't get much past pencilmarkings with only a few placed digits and tons of candidates in each cell. |
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Steve R
Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England
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| Posted: Tue Apr 22, 2008 2:15 pm Post subject: |
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I'm sure you placed 6 in r1c1.
Have you checked how the entries in column 1 and row 6 influence box 4?
Steve |
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sheryl
Joined: 24 Sep 2007
Posts: 64
Location: New York
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| Posted: Tue Apr 22, 2008 3:03 pm Post subject: |
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| Quote: | I'm sure you placed 6 in r1c1.
Have you checked how the entries in column 1 and row 6 influence box 4?
Steve |
yes i placed the 6 in col. 1, i also placed a 2 in col. 1 i also plced a 9 and a 2 in row 6. and i have two locked sets in box 4. but i'm still stuck. |
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Steve R
Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England
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| Posted: Tue Apr 22, 2008 3:33 pm Post subject: |
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If this is really where you are:
| Code: | +-----------------------+
| 6 1 3 | . . . | . . 2 |
| 8 . 7 | . . . | . . . |
| 5 9 . | 8 . . | . . . |
-------------------------
| . . 9 | . 7 3 | . . . |
| . . . | 2 . 1 | . . . |
| 2 . . | 6 8 9 | 4 . . |
-------------------------
| . . . | . . 6 | . 4 1 |
| . . . | . . . | 6 . 7 |
| 4 . . | . . . | 5 9 . |
+-----------------------+ |
I think the rest is singles but I’m not sure how you placed 2 in column 1. I had to use an XYZ-wing.
Even without the 2 in column 1, isn’t 3 forced into r6c9?
Steve |
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ravel
Joined: 21 Apr 2006
Posts: 536
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| Posted: Tue Apr 22, 2008 4:07 pm Post subject: |
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| Triple-click or mark with the mouse to see the hint wrote: | After placing the 6 clean the candidates and try to find the same 3 numbers in a row and a column. This will give you 2 hidden triples in boxes.
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sheryl
Joined: 24 Sep 2007
Posts: 64
Location: New York
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| Posted: Tue Apr 22, 2008 4:13 pm Post subject: |
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| Steve R wrote: | If this is really where you are:
| Code: | +-----------------------+
| 6 1 3 | . . . | . . 2 |
| 8 . 7 | . . . | . . . |
| 5 9 . | 8 . . | . . . |
-------------------------
| . . 9 | . 7 3 | . . . |
| . . . | 2 . 1 | . . . |
| 2 . . | 6 8 9 | 4 . . |
-------------------------
| . . . | . . 6 | . 4 1 |
| . . . | . . . | 6 . 7 |
| 4 . . | . . . | 5 9 . |
+-----------------------+ |
I think the rest is singles but I’m not sure how you placed 2 in column 1. I had to use an XYZ-wing.
Even without the 2 in column 1, isn’t 3 forced into r6c9?
Steve |
how is the 3 forced. and i actually placed the 2 in r4c1 and r6c8, so so much for what i've done. (and i can't remember what led me to those points) so can you tell me how you got to yours? where was the xyx wing that placed the 2 in 6,1??? |
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Steve R
Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England
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| Posted: Tue Apr 22, 2008 4:53 pm Post subject: |
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| Code: | +-----------------------+
| 6 1 3 | . . . | . . 2 |
| 8 . 7 | . . . | . . . |
| 5 9 . | 8 . . | . . . |
-------------------------
| . . 9 | . 7 3 | . . . |
| . . . | 2 . 1 | . . . |
| . . . | 6 8 9 | 4 . . |
-------------------------
| . . . | . . 6 | . 4 1 |
| . . . | . . . | 6 . 7 |
| 4 . . | . . . | 5 9 . |
+-----------------------+ |
The (468) triple in box 4 ensures that the 5 in that box lies in row 6. All candidates but 3 are then excluded from r6c9.
If you spot the pairs (59) (in column 4), (68) (in row 4) and (23) in row 7, you should get to here:
| Code: | +---------------------------------------+
| 6 1 3 | 7 9 4 | 8 5 2 |
| 8 2 7 | 13 6 5 | 9 13 4 |
| 5 9 4 | 8 13 2 | 13 7 6 |
-----------------------------------------
| 12 68 9 | 4 7 3 | 12 68 5 |
| 3 4 68 | 2 5 1 | 7 68 9 |
| 127 57 125 | 6 8 9 | 4 12 3 |
-----------------------------------------
| 79 578 58 | 59 23 6 | 23 4 1 |
| 129 35 125 | 59 4 8 | 6 23 7 |
| 4 36 26 | 13 123 7 | 5 9 8 |
+---------------------------------------+ |
Now take r8c2 as the pivot of an XYZ-wing. You'll be able to eliminate 5 from r8c2 and complete the puzzle.
Steve |
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sheryl
Joined: 24 Sep 2007
Posts: 64
Location: New York
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| Posted: Tue Apr 22, 2008 5:48 pm Post subject: |
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| Steve R wrote: | | Code: | +-----------------------+
| 6 1 3 | . . . | . . 2 |
| 8 . 7 | . . . | . . . |
| 5 9 . | 8 . . | . . . |
-------------------------
| . . 9 | . 7 3 | . . . |
| . . . | 2 . 1 | . . . |
| . . . | 6 8 9 | 4 . . |
-------------------------
| . . . | . . 6 | . 4 1 |
| . . . | . . . | 6 . 7 |
| 4 . . | . . . | 5 9 . |
+-----------------------+ |
The (468) triple in box 4 ensures that the 5 in that box lies in row 6. All candidates but 3 are then excluded from r6c9.
If you spot the pairs (59) (in column 4), (6 (in row 4) and (23) in row 7, you should get to here:
| Code: | +---------------------------------------+
| 6 1 3 | 7 9 4 | 8 5 2 |
| 8 2 7 | 13 6 5 | 9 13 4 |
| 5 9 4 | 8 13 2 | 13 7 6 |
-----------------------------------------
| 12 68 9 | 4 7 3 | 12 68 5 |
| 3 4 68 | 2 5 1 | 7 68 9 |
| 127 57 125 | 6 8 9 | 4 12 3 |
-----------------------------------------
| 79 578 58 | 59 23 6 | 23 4 1 |
| 129 35 125 | 59 4 8 | 6 23 7 |
| 4 36 26 | 13 123 7 | 5 9 8 |
+---------------------------------------+ |
Now take r8c2 as the pivot of an XYZ-wing. You'll be able to eliminate 5 from r8c2 and complete the puzzle.
Steve |
i guess i have to start from the beginning |
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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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| Posted: Tue Apr 22, 2008 6:09 pm Post subject: VH |
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Also, an xy-chain eliminates the 8 from R5C3 and solves the puzzle.
Earl |
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Kdelle
Joined: 20 Mar 2008
Posts: 59
Location: Hudson, NH
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| Posted: Tue Apr 22, 2008 7:22 pm Post subject: |
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Sheryl,
I also am not sure how you placed the 2 in column one so early as it was one of the last numbers I placed in the puzzle. The XYZ wing on 5-7-8 opened it up for me.
If you do start it again, the earlier hint about the C1 and R6 affect on Box 4 should really help.
Good luck.
Kathy |
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sheryl
Joined: 24 Sep 2007
Posts: 64
Location: New York
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| Posted: Tue Apr 22, 2008 10:50 pm Post subject: |
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| well, i did the whole thing over again. very carefully. there were lots and lots of deductions and then an xyz wing (on the 578 in B7) that did it for me. finally! |
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