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competition #1055

 
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Fri May 30, 2008 7:16 pm    Post subject: competition #1055 Reply with quote
Code:
. . .|2 . 4|. . .
. . 6|. 5 .|. . .
. . .|6 . .|. . 7
-----+-----+-----
. . 4|. 1 .|8 . .
. 9 .|. . .|. 1 2
. . 5|. 3 .|4 . .
-----+-----+-----
3 . .|. . 1|. . .
. . 8|. 7 .|6 . .
. 2 .|9 . .|. . .


Code:
.------------------------.------------------------.------------------------.
| 7       358    #19     | 2      *89      4      |-139     35689  -135689 |
| 49      38      6      | 1       5       7      | 2       3489    3489   |
| 149     58      2      | 6      *89      3      |#19      4589    7      |
:------------------------+------------------------+------------------------:
| 26      7       4      | 5       1       29     | 8       369     369    |
| 8       9       3      | 7       4       6      | 5       1       2      |
| 26      1       5      | 8       3       29     | 4       7       69     |
:------------------------+------------------------+------------------------:
| 3       6       79     | 4       2       1      | 79      58      58     |
| 19      4       8      | 3       7       5      | 6       2       19     |
| 5       2       17     | 9       6       8      | 137     34      134    |
'------------------------'------------------------'------------------------'


you can either view this one stepper as a xy-chain or a w-wing, either way the 1's in r1c79 are removed and solves the puzzle.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Fri May 30, 2008 8:58 pm    Post subject: Reply with quote
Idea I may need to change the sequence I use to check for eliminations since I seemed to solve these puzzles via many step operations. In this case, I started with a finned x-wing that deleted the <1> in r1c9 but that did not solve the puzzle. (As noted by Norm, you also need to delete the <1> in r1c7.) I then proceeded to use a UR, coloring, a swordfish and finally an xy-wing to overcome this beast.

Ted
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