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playr.co.uk "Very Hard" reigns supreme on 5/12/09

 
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Tue May 12, 2009 8:43 pm    Post subject: playr.co.uk "Very Hard" reigns supreme on 5/12/09 Reply with quote
a list of the three "tougher" puzzles from the playr.co.uk site
one of those days, consistent enough it seems, where the Very Hard puzzle is more difficult than the others.

Very Hard
Code:

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

Play this puzzle online at the Daily Sudoku site

fiendish
Code:

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

Play this puzzle online at the Daily Sudoku site

extreme
Code:

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

Play this puzzle online at the Daily Sudoku site
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue May 12, 2009 11:38 pm    Post subject: Reply with quote
I did the VH only, so I don't know how it compares, but it was a little stubborn.

Quote:
XY-Wing (276) plus pincer transport twice, XY-Chain which left a 12 pair in R9 and completed the puzzle
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Wed May 13, 2009 3:24 am    Post subject: Reply with quote
My first step was identical to Marty's, but the second step did not involve a chain.
Quote:

XY-Wing (276) plus pincer transport twice,
coloring on 6 resulted in several eliminations and completed the puzzle.

Ted
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