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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Oct 08, 2010 5:27 am Post subject: Puzzle 10/10/08: C XY |
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| Code: | +-----------------------+
| 7 . . | . 4 . | . . . |
| . 4 6 | . 7 . | . . 8 |
| . 2 3 | . 6 . | . 7 1 |
|-------+-------+-------|
| . . . | . 8 . | 3 . 4 |
| 3 6 8 | 4 5 . | . 1 . |
| . . . | . . 7 | 6 8 . |
|-------+-------+-------|
| . . . | 5 . 4 | . 3 . |
| . . 7 | . 3 6 | 8 2 . |
| . 3 5 | 7 . . | . . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Fri Oct 08, 2010 9:09 am Post subject: |
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| Quote: | XY Wing Style : 8B1 5R3 (5=19)R1C26 : r1c2<>19
Remote Pairs (19) : r6c2<>19
BUG+2 : r1c4=1 or r1c6=9 -> r8c4=9 |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Fri Oct 08, 2010 9:20 pm Post subject: |
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Found this one tough! Four steps with no basics between the first three...
| Quote: | xy-chain ; (1=5)r2c1 - (5=2)r2c7 - (2=1)r2c4 - (1=9)r8c4 - (9=1)r8c2 ; r1c2<>1, r79c1<>1
remote pairs(19) grouped r8c2, r6c5 ; r6c2<>19=5
s-wing(89) ; (9)r8c2=r8c4 - (9=8)r3c4 - (8)r1c4=r1c2 ; r1c2<>9
skyscraper(9) ; r4c6<>9 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Oct 08, 2010 9:40 pm Post subject: |
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Three really fun steps.........
| Quote: | Grouped RP(19) r8c2=>r8c4=>r79c5=>r6c5; r6c2<>19=5 (Fun but not needed. See next step.)
ANP(19=5)r1c36-(5=9r3c6*-(89=5)als:r3c14-(5=1)r2c1; r1c4*<>9,r1c2<>1
w-wing (89)r1c2 & r3c4 SL (9)r8c24; r1c4,r3c1<>8 |
Edit: Corrected error deletion of 5 in r1c2
Ted
Last edited by tlanglet on Fri Oct 08, 2010 11:59 pm; edited 1 time in total |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Fri Oct 08, 2010 10:32 pm Post subject: |
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Ted, interesting second move! I can see the elimination of...
(9)r1c4 since either (19)r1c36 or (9)r3c6; and...
(1)r1c2 since either (19)r1c36 or (1)r2c1; but...
I'm having a hard time to see the (5) elimination?
Just intuitively I don't see a fragment of your AIC that starts with "not a 5" and ends with "is a 5" that makes that elimination. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Oct 08, 2010 11:56 pm Post subject: |
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| peterj wrote: | Ted, interesting second move! I can see the elimination of...
(9)r1c4 since either (19)r1c36 or (9)r3c6; and...
(1)r1c2 since either (19)r1c36 or (1)r2c1; but...
I'm having a hard time to see the (5) elimination?
Just intuitively I don't see a fragment of your AIC that starts with "not a 5" and ends with "is a 5" that makes that elimination. |
Peter, it is my move to be 
After posting this result, I went outdoors to cut some more firewood to heat the house this winter and was suddenly struck by the fact that I messed up badly in handling that 5. My original solution included the three steps I posted, but then when I prepared the post I suddenly thought step 2 could delete the 5 in r1c2 and edited my post accordingly. I will edit my original post.
Ted |
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