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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Sun Mar 09, 2008 5:20 pm Post subject: March 9 - hard |
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Try this one without pencil marks.
Hint: Placing the <6> in B2 breaks it wide open.
Keith |
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Mindwarp
Joined: 13 Sep 2007
Posts: 25
Location: St. Ives, England
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| Posted: Sun Mar 09, 2008 6:06 pm Post subject: |
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| Hard, I don't think so doing it online took 4:08. That was one of the easiest hard puzzles I've done on here. There was absolutely nothing to it, just sweep and go! |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Mar 09, 2008 6:39 pm Post subject: |
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| Mindwarp wrote: | | Hard, I don't think so doing it online took 4:08. That was one of the easiest hard puzzles I've done on here. There was absolutely nothing to it, just sweep and go! |
Hi Mindwarp,
Keith wasn't saying that this puzzle is hard to do, I think he's saying that it's interesting--possibly challenging--(I haven't done it) when doing it without pencil marks, i.e., no "Sweep."
Cheers. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Mar 09, 2008 7:27 pm Post subject: |
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Yes, the "hard" in the title is the rating of the puzzle, not my opinion.
It involves at least a hidden pair. I think I solved it by box-line interactions.
Keith |
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ravel
Joined: 21 Apr 2006
Posts: 536
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| Posted: Sun Mar 09, 2008 8:29 pm Post subject: |
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| Code: | +-------+-------+-------+
| .>1 6 | 4 . . | . .>9 |
| . . . | . 8 h | . . 4 |
| . 3 . | . h 5 | . . . |
+-------+-------+-------+
| . 5 . |>1 . . | . 4*2 |
| .*2 . | 5 . 6 | . 7 . |
| 9 . . | x x 8 | . 5 . |
+-------+-------+-------+
| . . . |>9 . . |*2 1 . |
|*2 . . | . 5 . | . . . |
| 7 . . | x x 3 | 4 6 . |
+-------+-------+-------+ |
I am with Keith, solving it without pencilmarks is very different and mostly more interesting.
In this early stage (before placing other singles) i saw the hidden pair 19 in box 2 and the x-wing for 2 (yes with pm's i would first see, that the 2's are locked in box 2), so i continued with 2 in r1c6.
So - not challenging, but fun anyway. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Mon Mar 10, 2008 3:15 am Post subject: |
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Without pencil marks, I got to here:
| Code: | +-------+-------+-------+
| 8 1 6 | 4 . . | 5 . 9 |
| 5 . . | . 8 . | . . 4 |
| 4 3 . | . . 5 | . 8 . |
+-------+-------+-------+
| . 5 . | 1 . . | . 4 2 |
| 1 2 . | 5 . 6 | . 7 . |
| 9 . . | . . 8 | . 5 . |
+-------+-------+-------+
| . . . | 9 . . | 2 1 . |
| 2 . . | . 5 . | . 9 . |
| 7 . . | . . 3 | 4 6 . |
+-------+-------+-------+ |
After looking for a considerable time, I saw that:
The <7> in B2 is in R1. (Easy to see.)
The <2> in B2 is in C6. (Easy to see.)
Putting them together (without pm's) was not so easy for me: R3C4 must be <6>!
Which places all the values <6>, and solves the puzzle.
Keith
PS: ravel's note is interesting. Since the "hard" puzzles can be solved without X-wings (or UR's, for that matter), I tend not to look for them, and not to use them if I see them.
A personal rule, like the one we all have about stepping on cracks in the sidewalk. |
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