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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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 Posted: Wed Apr 29, 2009 7:11 am Post subject: vanhegan's fiendish 4/29/09 |
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| Code: |
+-------+-------+-------+
| 8 2 . | . 3 . | . . 4 |
| 4 . . | . . 2 | . . 7 |
| . 1 . | 4 . . | . . . |
+-------+-------+-------+
| 1 6 . | . . 4 | 7 . . |
| . . . | 9 5 3 | . . . |
| . . 4 | 1 . . | . 8 9 |
+-------+-------+-------+
| . . . | . . 1 | . 7 . |
| 5 . . | 2 . . | . . 6 |
| 7 . . | . 4 . | . 1 8 |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
enjoy! |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed Apr 29, 2009 2:17 pm Post subject: |
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Yesterday, Vanhegan's Fiendish was a one-stepper; today it was a real beast (for me)!
| Quote: | xy-wing 356 with pivot 35 in r7c4 to delete 6 in r2c3. Transporting the 6 in r7c3 to r3c1 via r7c1 also deleted 6 in r3c56,
x-wing 9 in r37c15.
At this point I tried all kinds of stuff but failed to find a pattern, so I started looking for a chain and found one.
(5=6)r1c3 - (6=9)r3c1 - (9=8)r3c5 - (8=5)r3c6; r1c6<>5.
I again tried to find a pattern step but failed and had to again look for a chain.
(6=9)r1c6 - (9=8)r3c5 - (8=5)r3c6 - (5=3)r3c9 - (3=6)r3c7; r1c8<>6.
A BUG+3 condition then forced r7c7=5 to complete the puzzle.
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A very long, hard puzzle but successful.
Ted  |
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