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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Tue Nov 17, 2009 4:54 pm Post subject: Puzzle NR 09/11/17 (A) |
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| Code: | +-----------------------+
| . 3 . | 2 . . | . . . |
| 5 . 4 | 6 . . | . 3 7 |
| . 7 . | . 5 3 | . . . |
|-------+-------+-------|
| 4 1 . | . 6 . | . 5 2 |
| . . 2 | 1 3 . | . . . |
| . . 6 | . . . | . . 1 |
|-------+-------+-------|
| . . . | . . . | 7 . . |
| . 6 . | 7 . . | . 9 3 |
| . 4 . | 3 . 9 | . 1 8 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Nov 18, 2009 6:13 am Post subject: |
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I had difficulty; a six-stepper.
ER, Hidden UR, W-Wing, XY-Wing, XY-Wing with pincer transport and a Kite. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Nov 18, 2009 9:11 am Post subject: |
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I too had difficulty:
skyscraper 2
w-wing 74
xy-wing 895 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed Nov 18, 2009 3:58 pm Post subject: |
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I was in the same situation; moves were hard to spot and some seem not to be useful.
My three moves were a
skyscraper 2 in r7c28,
a xy-wing 4-78 with the vertex extended into a chain: (7=4)r1c6 - (4=8)r3c4 - (8=5)r7c4 - (5=4)r6c4 - (4=7)r6c5; r1c5, r5c6<>7
xy-wing 5-89 with vertex 59 in r6c2, pincer 89 in r5c1 and pincer 58 is a pseudocell in r36c4; r3c1<>8. Then transport 8 in r5c1: (8)r5c1 - (8)r5c2 = (8)r7c2; r7c4<>8 to complete the puzzle.
Ted |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Nov 18, 2009 5:06 pm Post subject: |
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It's interesting how some puzzles end up being more difficult than my solver would indicate.
| Code: | c3b1 Locked Candidate 2 <> 9 r13c1,r2c2
c28r7 Skyscraper <> 2 r2c7,r3c1 -or-
r28c7 Skyscraper <> 2 r3c1,r7c2
c7 Naked Triple <> 489 r138c7
r7 b9 Locked Candidate 1 <> 4 r7c45
c7b6 Locked Candidate 2 <> 4 r5c89,r6c8
XY-Wing r7c4/r3c4+r7c9 <> 4 r3c9 extraneous
XY-Wing r7c4/r3c4+r8c6 <> 4 r1c6
XY-Wing r7c2/r6c2+r7c4 <> 5 r6c4
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed Nov 18, 2009 6:40 pm Post subject: |
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| daj95376 wrote: | It's interesting how some puzzles end up being more difficult than my solver would indicate.
| Code: | c3b1 Locked Candidate 2 <> 9 r13c1,r2c2
c28r7 Skyscraper <> 2 r2c7,r3c1 -or-
r28c7 Skyscraper <> 2 r3c1,r7c2
c7 Naked Triple <> 489 r138c7
r7 b9 Locked Candidate 1 <> 4 r7c45
c7b6 Locked Candidate 2 <> 4 r5c89,r6c8
XY-Wing r7c4/r3c4+r7c9 <> 4 r3c9 extraneous
XY-Wing r7c4/r3c4+r8c6 <> 4 r1c6
XY-Wing r7c2/r6c2+r7c4 <> 5 r6c4
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Danny, I agree with your comment. I frequently note that others found a much easier/simpler solution than I did, but it is particularly interesting when several people all agree that a puzzle was difficult.
In this case, I now realize that the basic xy-wings your solver found were available at the stage when I found a more involved xy-wing; I simply found the longer solution before getting around to the simple one.
This is all part of the enjoyment of Sudoku
Ted |
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