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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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 Posted: Sat Dec 29, 2007 10:02 pm Post subject: daily telegraph 12/28 |
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| Code: | 5 . . | . . 9 | . . 8
4 8 . | . . . | . 6 9
. . 6 | . . 7 | 1 . .
------+-------+------
. . . | 5 6 2 | . . .
. . . | . . . | . . .
. . . | 8 3 4 | . . .
------+-------+------
. . 1 | 2 . . | 8 . .
8 . . | . . . | . 7 6
7 . . | 9 . . | . . 4
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sat Dec 29, 2007 10:43 pm Post subject: |
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| Code: | 5 1 237 | 6 24 9 | 347 234 8
4 8 237 | 13 12 5 | 37 6 9
239 239 6 | 34 8 7 | 1 2345 235
------------------------+-------------------------+------------------
139 379 48 | 5 6 2 | 34G9 3489 17
236 235 48 | 7 9 1 | 56 48 23
1269 2579 5g9 | 8 3 4 | 56 2-9 17
------------------------+-------------------------+------------------
39 4 1 | 2 7 6 | 8 35G9 35
8 259 5r9 | 14 14 3 | 2R9 7 6
7 6 23 | 9 5 8 | 23 1 4
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obvious UR on {4,8} in r4c38 and r5c38
then an x-wing on 3's
then an awesome multicoloring elimination on {9} killing the 9 in r6c8
I marked the coloring in the grid.
the capitol R, G is one coloring chain
the lower r, g is the other chain.
the rule states that if R and r share a column, row or box then the other greens ( G and g ) can eliminate a candidate they both can see.
any thoughts or corrections or simplification would be nice. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Dec 29, 2007 10:51 pm Post subject: |
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| Quote: | | any thoughts or corrections or simplification would be nice. |
I don't understand. The chain with capital letters is three cells and I thought coloring chains have to be even number of cells. But regardless, it seems like the elimination of the 9 is from a simple skyscraper in columns 3 and 7. Maybe I'm missing something. |
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Johan
Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
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| Posted: Sat Dec 29, 2007 10:54 pm Post subject: |
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There is an ER for digit <9> in Box 9, the ERI in R8C8 can see one of the strong link* on <9> in C3, which
eliminates <9> in R6C8 and the puzzle succumbs
| Code: |
+--------------------------+--------------------------+--------------------------+
| 5 1 237 | 6 24 9 | 347 234 8 |
| 4 8 237 | 13 12 5 | 37 6 9 |
| 239 239 6 | 34 8 7 | 1 2345 235 |
+--------------------------+--------------------------+--------------------------+
| 139 379 48 | 5 6 2 | 349 3489 17 |
| 236 235 48 | 7 9 1 | 56 48 23 |
| 1269 2579 59* | 8 3 4 | 56 2-[9] 17 |
+--------------------------+--------------------------+--------------------------+
| 39 4 1 | 2 7 6 | 8 er 359 35 er |
| 8 259 59* | 14 14 3 | 29 7 eri 6 |
| 7 6 23 | 9 5 8 | 23 er 1 4 er |
+--------------------------+--------------------------+--------------------------+ |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Dec 29, 2007 11:02 pm Post subject: |
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So far as I can see, the UR solves it, with only singles to follow. I was looking at how to do it without the UR, it seems quite difficult.
By the way, there is also a Type 6 UR on <37> in R12C37. It takes out <3> in R1C3.
Keith |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sat Dec 29, 2007 11:06 pm Post subject: |
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| aha, an ER is what I was actually looking at. and I was so "into" the puzzle I didn't even notice that the UR solves it. I was looking for other stuff. geez, get a life norm |
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Johan
Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
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| Posted: Sat Dec 29, 2007 11:22 pm Post subject: |
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| I noticed something else to solve the puzzle with one move, when R3C4=3, it creates a [37] DP in R12C37, which means that R3C4=4 |
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