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mdjjpapa
Joined: 06 Oct 2006
Posts: 5
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 Posted: Fri Oct 06, 2006 10:11 pm Post subject: Logic Problem |
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After getting to the point below in todays puzzle the hint told me where to place the "9", but I am unable to figure out by logic how the "6" got eliminated. Can someone please explain the hint.
Thanks,
David
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gohast
Joined: 26 Sep 2006
Posts: 18
Location: Dublin, Ireland
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| Posted: Fri Oct 06, 2006 10:56 pm Post subject: |
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There is an X-Wing on 6 (R1 C4) (R1 C7) and (R5 C4) (R5 C7). This eliminates the 6 in (R2 C7)
Graham |
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TKiel
Joined: 22 Feb 2006
Posts: 292
Location: Kalamazoo, MI
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| Posted: Sat Oct 07, 2006 9:14 pm Post subject: |
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There is also a complementary X-wing in r2c5, r4c5, r2c9, & r4c9 which makes the same exclusion.
In trying to replicate the candidate list shown above, I got to this point | Code: |
*-----------------------------------------------------------*
| 7 8 1 | 269 5 29 | 26 4 3 |
| 5 2 3 | 4 67 8 | 69 19 1679 |
| 4 9 6 | 1 3 27 | 5 8 27 |
|-------------------+-------------------+-------------------|
| 1 3 9 | 567 67 4 | 8 2 56 |
| 8 7 5 | 69 2 1 | 36 39 4 |
| 2 6 4 | 359 8 359 | 1 7 59 |
|-------------------+-------------------+-------------------|
| 9 5 8 | 23 4 6 | 7 13 12 |
| 6 4 27 | 8 1 237 | 239 5 29 |
| 3 1 27 | 257 9 257 | 4 6 8 |
*-----------------------------------------------------------*
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but couldn't figure out how the 2 & 7 were placed in box 7. |
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