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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Wed Apr 06, 2011 5:23 pm Post subject: Puzzle 11/04/06: ~ Difficult |
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| Code: | +-----------------------+
| . 9 4 | . . 1 | . 6 2 |
| 8 . 6 | 7 . . | . 3 . |
| 1 3 5 | 2 8 6 | . 7 . |
|-------+-------+-------|
| . 4 7 | 6 . . | . . . |
| . . 8 | . . 7 | . . 6 |
| 6 . 9 | . 2 8 | . . . |
|-------+-------+-------|
| . . . | . . . | 2 . . |
| 4 7 2 | . . . | . 5 . |
| 9 . . | . 7 . | . . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Thu Apr 07, 2011 6:46 pm Post subject: |
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Very interesting symmetrical pattern in box 8! Notice that there is a strong link 8 in b8/c4, strong link 3 in b8/c6 and strong link 6 on b8/c5. These are coupled together s-wing-like using the (68)r7c2 and (36)r8c7 - throw in matching bivalues on 1...
| Code: | *-----------------------------------------------------*
| 7 9 4 | 3 5 1 | 8 6 2 |
| 8 2 6 | 7 49 49 | 1 3 5 |
| 1 3 5 | 2 8 6 | 4 7 9 |
|----------------+-------------------+----------------|
| 23 4 7 | 6 13 5 | 9 128 18 |
| 23 1 8 | 49 349 7 | 5 24 6 |
| 6 5 9 | 14 2 8 | 7 14 3 |
|----------------+-------------------+----------------|
| 5 (68) (13) | 14(8) -14(6) 4(3) | 2 9 7 |
| 4 7 2 | 19(8) -19(6) 9(3) | (36) 5 (18) |
| 9 68 13 | 5 7 2 | 36 18 4 |
*-----------------------------------------------------*
(1=3)r7c3 - (3)r7c6=r8c6 - (3=6)r8c7
- (6)r8c5=r7c5 - ; r7c5<>1
(6=8)r7c2 - (8)r7c4=r8c4 - (8=1)r8c9 ; r8c5<>1 |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Thu Apr 07, 2011 8:07 pm Post subject: |
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| peterj wrote: | | Code: |
(1=3)r7c3 - (3)r7c6=r8c6 - (3=6)r8c7
- (6)r8c5=r7c5 - ; r7c5<>1
(6=8)r7c2 - (8)r7c4=r8c4 - (8=1)r8c9 ; r8c5<>1 |
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You seem to have intertwined two chains that share the strong link (6)r8c5 = (6)r7c5. For me, they're easier to understand separately.
(6)r8c5 = (6)r7c5 = (6=8)r7c2 - (8)r7c4 = (8)r8c4 - (8=1)r8c9 ==> r8c5<>1
(1=3)r7c3 - (3)r7c6 = (3)r8c6 - (3=6)r8c7 - (6)r8c5 = (6)r7c5 ==> r7c5<>1 |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Thu Apr 07, 2011 8:23 pm Post subject: |
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| ronk wrote: | | You seem to have intertwined two chains that share the strong link |
Absolutely. just thought there was an interesting symmetry to the two chains! |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Apr 08, 2011 1:01 am Post subject: |
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| After a Kite, r8c4<>1, I couldn't find a move, but it fell easily to a Medusa wrap. |
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