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L.A. times 1/18

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storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Fri Jan 18, 2008 9:04 am Post subject: L.A. times 1/18

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Code:

. . . | 4 . 1 | . 9 .
. . 6 | . 9 . | 2 . .
. 3 . | . . . | . 8 .
---------------------
8 . . | 3 . . | . . 2
. . 1 | . 7 . | 6 . .
2 . . | . . 5 | . . 9
---------------------
. 8 . | . . . | . 3 .
. . 5 | . 8 . | 7 . .
. 4 . | 5 . 2 | . . .

this puzzle is on the same plane as the "very hard" puzzles on this site

it solved nicely after one advanced step.

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keith

Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

Posted: Sat Jan 19, 2008 5:24 pm Post subject:

Actually, it is harder than a "very hard". It cannot be solved by X-wing, XY-wing or XYZ-wing. But, there are a number of choices for the advanced step. By the way, this is the same as the Detroit Free Press (Freep) puzzle. Keith

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Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Sat Jan 19, 2008 7:03 pm Post subject:

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Quote:

it solved nicely after one advanced step.

I wonder if we did the same thing. Mine was simple coloring on a very small number.

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nataraj

Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

Posted: Sat Jan 19, 2008 7:22 pm Post subject:

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Marty R. wrote:

Quote:

it solved nicely after one advanced step.

I wonder if we did the same thing. Mine was simple coloring on a very small number.

Me too - this is the pattern of "1"

Code:

+·····+·····+·····+
· · · ·
· · · ·
· #-----------# ·
· /| · · | ·
·# | · ·o | #·
+|·|··+·····+··|·|+
·| | · ·#-# |·
·| | · · |·
·| | · · |·
·| | · · |·
·| | · · |·
+|·|··+·····+····|+
·| | · · |·
·| | · · |·
·| #-------------#·
·|/ · · /-/ ·
·#-----------# ·
+·····+·····+·····+

1 can be removed from r2c8, r3c1, r3c9, r4c7, r8c2, r9c7

in this grid:

Code:

+--------------------------+--------------------------+--------------------------+
| 7 2 8 | 4 5 1 | 3 9 6 |
| 4 15 6 | 8 9 3 | 2 15 7 |
| 15 3 9 | 67 2 67 | 145 8 145 |
+--------------------------+--------------------------+--------------------------+
| 8 7 4 | 3 6 9 | 15 15 2 |
| 59 59 1 | 2 7 8 | 6 4 3 |
| 2 6 3 | 1 4 5 | 8 7 9 |
+--------------------------+--------------------------+--------------------------+
| 6 8 2 | 79 1 47 | 459 3 45 |
| 3 19 5 | 69 8 46 | 7 2 14 |
| 19 4 7 | 5 3 2 | 19 6 8 |
+--------------------------+--------------------------+--------------------------+

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storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Sat Jan 19, 2008 7:27 pm Post subject:

I was wondering if the free press was the same as the L.A. times

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storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Sat Jan 19, 2008 9:17 pm Post subject:

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keith wrote:

Actually, it is harder than a "very hard". It cannot be solved by X-wing, XY-wing or XYZ-wing. But, there are a number of choices for the advanced step.

By the way, this is the same as the Detroit Free Press (Freep) puzzle.

Keith

ahh, sorry, I know you usually post the free press puzzles.

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Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Sat Jan 19, 2008 10:10 pm Post subject:

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Quote:

1 can be removed from r2c8, r3c1, r3c9, r4c7, r8c2, r9c7

in this grid:

Code:

+--------------------------+--------------------------+--------------------------+
| 7 2 8 | 4 5 1 | 3 9 6 |
| 4 15 6 | 8 9 3 | 2 15 7 |
| 15 3 9 | 67 2 67 | 145 8 145 |
+--------------------------+--------------------------+--------------------------+
| 8 7 4 | 3 6 9 | 15 15 2 |
| 59 59 1 | 2 7 8 | 6 4 3 |
| 2 6 3 | 1 4 5 | 8 7 9 |
+--------------------------+--------------------------+--------------------------+
| 6 8 2 | 79 1 47 | 459 3 45 |
| 3 19 5 | 69 8 46 | 7 2 14 |
| 19 4 7 | 5 3 2 | 19 6 8 |
+--------------------------+--------------------------+--------------------------+

All it takes is removal of the 1 from r3c9 based on a six-cell coloring chain starting at r2c8-->r2c2, etc.

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keith

Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

Posted: Sat Jan 19, 2008 10:46 pm Post subject:

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storm_norm wrote:

ahh, sorry, I know you usually post the free press puzzles.

norm,

Not a problem at all. Someone was asking the other day where the LA Times puzzles were, so I thought I'd just mention again that the Free Press and LA Times puzzles are the same.

Keith

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storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Mon Jan 21, 2008 7:52 am Post subject:

Marty, I made the exact same eliminations. so that is a yes to your previous post.

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