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kragzy
Joined: 01 May 2007
Posts: 112
Location: Australia
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 Posted: Wed Feb 06, 2008 12:15 am Post subject: Feb 6 |
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Back to relatively easy VH. One regulation XY wing and its done.
[edit: Title changed from Feb 8 to Feb 6 - keith] |
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kragzy
Joined: 01 May 2007
Posts: 112
Location: Australia
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| Posted: Wed Feb 06, 2008 4:25 am Post subject: |
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| Thanks Keith. Silly me. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Wed Feb 06, 2008 5:51 am Post subject: |
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| Code: | 38 18 4 | 2 6 15 | 39 7 359
39 12 239 | 15 4 7 | 6 35 8
6 7 5 | 8 9 3 | 2 4 1
---------------------------------------------------------------------
7 28 39 | 4 258 58 | 1 6 39
189 4 29 | 3 1278 6 | 79 258 25
138 5 6 | 17 1278 9 | 37 28 4
---------------------------------------------------------------------
2 3 17 | 1567 157 4 | 8 9 67
5 6 17 | 9 178 18 | 4 23 23
4 9 8 | 67 3 2 | 5 1 67
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UR type 1 on {6,7} in r79c49 does not solve it  |
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andras
Joined: 31 Oct 2007
Posts: 56
Location: Mid Wales
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| Posted: Wed Feb 06, 2008 9:17 am Post subject: Re: Feb 6 |
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| kragzy wrote: | Back to relatively easy VH. One regulation XY wing and its done.
[edit: Title changed from Feb 8 to Feb 6 - keith] |
Yes indeedy - it flowed very nicely, I thought - not all bitty and awkward.
John |
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Johan
Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
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| Posted: Wed Feb 06, 2008 9:32 am Post subject: |
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There is at first sight a useless Type 3 UR(I'm not sure about the Type number of this Unique Rectangle, I still can't memorize them) in R78C35*, but taking
a closer look at it, this useless UR can become very useful.
For avoiding the [17] DP(Deadly Pattern) either R7C5=5 or R8C5=8 or both(both is not an option here because it results in a triple <17> pair in Box 5), now
by transporting these two digits(5 and 8)we create two pincer cells for digit <8> (A and B), so we can eliminate <8> in R4C2.
A. R7C5=[5] => R4C6=[5] => R1C6=[1] => R1C2=[8]
B. R8C5=|8| => R8C6=|1| => R1C6=|5| => R4C6=|8|
| Code: | +--------------------------+--------------------------+--------------------------+
| 38 A 1[8] 4 | 2 6 [1]|5| | 39 7 359 |
| 39 12 239 | 15 4 7 | 6 35 8 |
| 6 7 5 | 8 9 3 | 2 4 1 |
+--------------------------+--------------------------+--------------------------+
| 7 2-[8] 39 | 4 258 B [5]|8| | 1 6 39 |
| 189 4 29 | 3 1278 6 | 79 258 25 |
| 138 5 6 | 17 1278 9 | 37 28 4 |
+--------------------------+--------------------------+--------------------------+
| 2 3 * 17 | 1567 * 1[5]7 4 | 8 9 67 |
| 5 6 * 17 | 9 * 17|8| |1|8 | 4 23 23 |
| 4 9 8 | 67 3 2 | 5 1 67 |
+--------------------------+--------------------------+--------------------------+ |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Wed Feb 06, 2008 1:11 pm Post subject: |
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| storm_norm wrote: |
UR type 1 on {6,7} in r79c49 does not solve it |
No, but that was also my first (advanced) step - too obvious to ignore (and it does solve r7c9=6, but not "it")
Then xy-wing 18-15-58 solving r4c2. Maybe that alone would have sufficed.
All in all, very straightforward. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Feb 06, 2008 4:35 pm Post subject: |
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| Quote: | No, but that was also my first (advanced) step - too obvious to ignore (and it does solve r7c9=6, but not "it")
Then xy-wing 18-15-58 solving r4c2. Maybe that alone would have sufficed. |
That noted philosopher, Yogi Berra, said, "if you come to a fork in the road, take it." If you see a rectangle, play it. So I did and later finished the puzzle with the XY-Wing. |
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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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| Posted: Sun Feb 10, 2008 1:48 pm Post subject: XY wing in top left hand corners |
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| My reaction to this one was that the XY Wing solves it but it starts in Box 1 and is all in the top left part of the puzzle whic is where for me it is easiest to spot! |
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DennyOR
Joined: 12 Sep 2007
Posts: 33
Location: Portland, Oregon
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| Posted: Fri Feb 15, 2008 7:57 pm Post subject: |
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| From storm_norm's position, the (r2c2) 12-28-85-51 (r1c6) xy-chain also solves the puzzle. |
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