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Just when I thought I could do these...I'mDead in the water

 
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daykart



Joined: 22 Nov 2005
Posts: 10

PostPosted: Wed Jan 18, 2006 4:55 pm    Post subject: Just when I thought I could do these...I'mDead in the water Reply with quote

The puzzle looks like this: ......... I am here

X X 8 X 2 X X X X.....................X X 8 X 2 X X X 4
1 6 X 4 X X X 8 X.....................1 6 X 4 X X X 8 X
4 X 5 X X 7 X X X.....................4 X 5 X X 7 X X X

6 X X 2 X X X 4 X.....................6 X X 2 X X X 4 X
X 1 X X X X X 7 X.....................X 1 X X X 4 X 7 X
X 5 X X X 6 X X 9.....................X 5 4 X X 6 X X 9

X X X 9 X X 4 X 3.....................X X X 9 X X 4 X 3
X X X X X 3 X 1 2.....................X 9 X X 4 3 X 1 2
X X X X 6 x 8 X X.....................X 4 X X 6 x 8 9 X


matrix:

379......37.......8.......1356........2.........159.......13679......356........4
1..........6......2379......4.........359.........59..........23...........8........57
4..........23.......5........1368.....1389.........7........12369......236......16

6.........378.....379........2......135789.....1589......135.........4.........18
2389.....1.......239......358......3589........4.........2356.........7.........68
2378.....5.......4.........1378.....1378........6..........123........23..........9

2578.....278...1267.......9......12578......1258.........4.........56..........3
58..........9.......67........58........4..............3...........67..........1..........2
2357.......4.....1237.....157.......6..........125..........8...........9.........57


Any HELP would be appreciated

Thanks
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someone_somewhere



Joined: 07 Aug 2005
Posts: 275
Location: Munich

PostPosted: Wed Jan 18, 2006 5:21 pm    Post subject: Reply with quote

Hi,

Supposing that this is what you want to solve:

,
Code:
..8|.2.|...
16.|4..|.8.
4.5|..7|...
-----------
6..|2..|.4.
.1.|...|.7.
.5.|..6|..9
-----------
...|9..|4.3
...|..3|.12
...|.6.|8..



I don't know from where you have this very nice puzzle, but it has multiple solutions.

You yould never trust anybody, not even yourself ...

P.S. I lost also a lot of time with a lot of puzzles from "some" internet pages, to find out at the end that they had multiple solutions.

My advice, use a program to check them before you are waisting your energy ...

see u,[/code]
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someone_somewhere



Joined: 07 Aug 2005
Posts: 275
Location: Munich

PostPosted: Thu Jan 19, 2006 12:15 pm    Post subject: Reply with quote

Hi,

David has pointed out a missing 9 in r8c2 in our initial (left) table.
If we start now from your right table:

Code:
  . . 8 . 2 . . . 4
  1 6 . 4 . . . 8 .
  4 . 5 . . 7 . . .
  6 . . 2 . . . 4 .
  . 1 . . . 4 . 7 .
  . 5 4 . . 6 . . 9
  . . . 9 . . 4 . 3
  . 9 . . 4 3 . 1 2
  . 4 . . 6 . 8 9 .


you can figure out:
- Nacked Pair 5 7 in r2c9 and r9c9 (same Column)
- 5 in r4c7 or r5c7 of the 3x3 (3x3 Block on Row/Column interaction)
and eliminate it from r1c7, r2c7 and r8c7
- Hidden Pair 5 8 in r8c1 and r8c4 (in Row)
and finally:
- 8 in r4c2 r7c2 r4c6 r7c6 (X-Wing on Row)
and eliminate it from r7c1, r4c5, r7c5 and r4c9
and now we have cracked it by setting:
1 in r4c9

the rest is easy ...

see u, and thank you David,


Last edited by someone_somewhere on Thu Jan 19, 2006 2:50 pm; edited 1 time in total
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David Bryant



Joined: 29 Jul 2005
Posts: 559
Location: Denver, Colorado

PostPosted: Thu Jan 19, 2006 2:04 pm    Post subject: Verification Reply with quote

Hi, Daykart! Hi, someone!

Just a quick note to say that I've indeed verified that the second position shown above can be reached easily if we put the "9" at r8c2. If that "9" is not in the initial puzzle, there's no way to reach the second position shown in Daykart's original message (and the puzzle has multiple solutions -- plus it's asymmetrical). So it must have been a typo. dcb Smile
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