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Set T_03 Puzzle 82 -- VH+

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Tue Apr 14, 2009 6:51 am Post subject: Set T_03 Puzzle 82 -- VH+

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Code:

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

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Code:

b8 Naked Triple <> 289 [r78c4]
c4b8 Locked Pair <> 16 [r45c4]
c7b6 Locked Candidate 1 <> 2 [r79c7]
r1 b1 Locked Candidate 1 <> 7 [r1c8]
r5 b6 Locked Candidate 2 <> 6 [r4c7],[r6c79]
r6 Naked Pair <> 89 [r6c257]

c39 X-Wing <> 7 [r5c17],[r7c178]

r9 b8 Locked Candidate 1 <> 9 [r9c78]

r49 X-Wing <> 8 [r5c4],[r578c7]

turbot fish/ER r6b7 <> 4 [r7c7]

Skyscraper r68c9 <> 8 [r5c1],[r7c3]

r5 Naked Pair <> 49 [r5c379]

c7b9 UR Type 2 [r78c47] <> 9 [r34c7],[r7c8],[r78c9]

Last edited by daj95376 on Mon Apr 20, 2009 8:51 am; edited 1 time in total

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tlanglet

Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

Posted: Tue Apr 14, 2009 11:04 pm Post subject:

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A fun puzzle! My last step eliminated two different digits in ten cells; a big winner.

Quote:

x-wing 7,
finned x-wing 4,
x-wing 8,
Type 2 UR with x-wing overlay for ten eliminations

Ted

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storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Wed Apr 15, 2009 6:23 am Post subject:

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Code:

.------------------------.------------------------.------------------------.
| 279 79 3 | 289 1 6 | 5 89 4 |
| 29 8 4 | 5 7 29 | 3 6 1 |
| 6 5 1 | 3 89 4 | 789 789 2 |
:------------------------+------------------------+------------------------:
| 5 4679 2 | 489 689 1 | 4789 4789 3 |
| 4789 1 789 | 2489 3 289 |A246789 5 6789 |
| 3 46 89 | 7 26 5 | 24 1 89 |
:------------------------+------------------------+------------------------:
| 4789 3 789 |U16 5 289 |U146789 24789 6789 |
| 89 2 5 |U16 4 7 |U1689 3 689 |
| 1 479 6 | 289 289 3 | 4789 24789 5 |
'------------------------'------------------------'------------------------'

Ted,
you can apply a form of a UR deduction right from the start for a one stepper.
I am guessing you saw the UR {1,6} in r78c47 ?

notice that there exists only one other 6 in column 7 at A in my grid and no other 1 in that column.
this means the the 6 is the only candidate that can exist at A which eliminates 2,4,7,8,9 and solves the puzzle.
in other words if the 6 does not exist at A then the deadly pattern is forced to exist.

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tlanglet

Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

Posted: Wed Apr 15, 2009 1:05 pm Post subject:

Great observation Norm. I purposely did not look for URs early, but I could not resist later when the Type 2 UR 16 just jumped out and it had so many deletions. Ted

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Marty R.

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

Posted: Sun Apr 19, 2009 11:12 pm Post subject:

The Type 4 UR on 16 was also my one-stepper.

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