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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Aug 27, 2010 4:52 am Post subject: Puzzle 10/08/27: B |
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| Code: | +-----------------------+
| 2 . . | . . . | . . . |
| . . 9 | 1 3 . | . 6 . |
| . 4 1 | . 8 6 | 9 . . |
|-------+-------+-------|
| . 2 . | 3 1 . | 4 . . |
| . 1 4 | . 2 . | . 8 . |
| . . 8 | . . 4 | . . . |
|-------+-------+-------|
| . . 2 | 5 . . | 8 . . |
| . 6 . | . 9 . | . 5 . |
| . 5 . | . . . | . . 6 |
+-----------------------+
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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: Fri Aug 27, 2010 5:33 pm Post subject: |
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All those 37 ADP at the bottom of the grid were tempting but I couldn't make anything of them.
Three VH steps...
| Quote: | type 1 UR(48) ; r9c4<>48
x-wing(7) ; r6c1<>7, r1c7<>7
xy-wing(35-7) r5c9 ; r7c6<>7 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Aug 27, 2010 6:16 pm Post subject: |
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Four fun steps while looking for AXY-wings.
| Quote: | Type 1 UR (48)r89c14; r9c4<>48
xy-wing -357 vertex (57)r5c6; r7c9<>3
AXY-wing 3-57 vertex (37)r1c2 pincers (35)r1c7 & (57)r2c1 with fin (17)r1c7
If xy-wing is true: r2c7<>5
If fin is true: ls(137)r1c278-(7)r1c5=r6c5-r6c12=r5c1-(7=5)r2c1; r2c7<>5
AXY-wing 23-7 vertex (23)r3c8 pincers (27)r2c7 & (37)r3c1 with fin (5)r3c1
If xy-wing is true: r2c1<>7
If fin is true: (5)r3c1-r3c9=r1c7-(5=7)r1c5-r3c4=(7)r3c1; r3c1<>5 contradiction |
Peter, I also spent an unreasonable amount of time looking at the various DP (37) patterns plus the AMUG(237) pattern to no avail.
Ted |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Sat Aug 28, 2010 7:09 am Post subject: |
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| Same as Peter's solution |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Aug 28, 2010 10:27 pm Post subject: |
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| My four steps used Peter's three steps as my #2-3-4. I didn't have a Type 1 UR for 48, but I did after examining the implications the Type 3 which made r9c1<>1. |
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