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arjun
Joined: 28 Sep 2009
Posts: 16
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 Posted: Wed Jun 02, 2010 9:35 pm Post subject: I need help with the Genius Puzzle |
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| Code: |
+-----------+------------+-----------+
| 9 4 6 | 3 7 1 | 58 2 58 |
| 12 5 12 | 49 6 8 | 479 3 479 |
| 3 8 7 | 2 5 49 | 1 6 49 |
+-----------+------------+-----------+
| 568 7 59 | 569 3 29 | 28 4 1 |
| 456 1 345 | 456 8 247 | 237 9 67 |
| 468 2 349 | 469 1 479 | 378 5 678 |
+-----------+------------+-----------+
| 25 9 8 | 1 24 6 | 45 7 3 |
| 7 6 25 | 8 24 3 | 459 1 459 |
| 14 3 14 | 7 9 5 | 6 8 2 |
+-----------+------------+-----------+
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Thanks in advance! |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Thu Jun 03, 2010 5:53 am Post subject: |
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The XY-Chains are too long and boring.
| Code: | forcing network ; contradiction => q.e.d.
r4c1=8 r4c4=6 r4c3=5 r6c3=9 r6c7=3 r1c7=8 r1c9=5 r8c7=5 r2c7=9; r26c4=4 => r4c1<>8
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wapati
Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
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| Posted: Sat Jun 05, 2010 12:10 am Post subject: |
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| I agree, I looked at it and saw a Death Blossom that I didn't mind but as a human solver, I would not find it. Ugly ( not fun ) puzzle. |
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Mindwarp
Joined: 13 Sep 2007
Posts: 25
Location: St. Ives, England
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| Posted: Thu Jun 10, 2010 3:11 pm Post subject: |
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| I looked and looked at it, couldn't see anything that would solve it , in the end I just went for a couple of intuitive guesses One was 2 on r4c6, it felt right. |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Jun 10, 2010 5:04 pm Post subject: |
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Just to be explicit about Danny's forcing chain and in case you're early on in your sudoku career:
To follow the chain, make consequent eliminations as you go along - it comes to a grinding halt because 2 single 4s (contradiction) are left on column 4. |
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