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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Apr 09, 2010 4:26 am Post subject: Puzzle 10/04/09 (C) |
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Friday sans <8> in givens
| Code: | +-----------------------+
| . 4 . | 9 . . | . 1 2 |
| 1 . 2 | . . 4 | 9 . 3 |
| . 9 3 | 1 . . | 7 . 4 |
|-------+-------+-------|
| 2 . 9 | 6 . . | . . . |
| . . . | . 1 . | . . 6 |
| . 6 . | . . . | 4 . . |
|-------+-------+-------|
| . 2 7 | . . 1 | 3 . . |
| 3 . . | . . . | . . . |
| 5 1 6 | . 3 . | . . 7 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Apr 09, 2010 4:52 pm Post subject: |
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A very fun puzzle that had the hint of a BBDBer. I used five steps, two of which were a little different; some may have not been needed.
Kraken finned x-wing 5 in r15c37 and fin in r4c7 and Kraken fin in r8c7.
If x-wing is true, then r1c5<>5 & r5c2468<>5,
If fin r4c7=5, then r5c468<>5,
If kraken fin r8c7=5, then r5c8<>5.
Thus only r5c8<>5 is valid for all three conditions. (A lot of work for a small result but fun!)
x-wing 6 in r27c58 deletes 6 in r138c5 and r38c8.
x-wing 9 in r59c68 deletes 9 in r6c68 & r8c68
xy-wing 25-8 with vertex 25 in r8c8 deletes r1c7 & r79c8
xyz-wing 678 in r1c1
(6)r1c1 - (6=5)r1c7 - (5=8)r1c3; r3c1<>8
(7)r1c1 - (7=5)r2c2 - (5=8)r1c3; r3c1<>8
(8)r1c1; r3c1<>8 thus r3c1<>8
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Apr 09, 2010 10:53 pm Post subject: |
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| I played a bunch of ERs to open things up a little. After that it was an M-Wing (58) and XY-Wing (586). |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sat Apr 10, 2010 10:30 am Post subject: |
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Seemed to come out with four basic VH steps for me...
| Quote: | x-wing(6)
x-wing(9)
xy-wing(258)
xy-wing(568) |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sat Apr 10, 2010 10:46 am Post subject: |
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| Peterj: That matches the simplest solution found by my solver. |
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