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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Wed Jul 14, 2010 8:48 am Post subject: Puzzle 10/07/14: XY |
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| Code: | +-----------------------+
| 4 . . | . . . | . . . |
| . 5 2 | . . . | . . 3 |
| . 6 3 | . 8 1 | . 2 . |
|-------+-------+-------|
| . . . | 8 5 . | . . . |
| . . 5 | 9 2 . | 3 6 . |
| . . 6 | . . . | . . 5 |
|-------+-------+-------|
| . . . | . 4 . | 6 . 1 |
| . . 4 | . 1 . | . 3 . |
| . 1 . | . . 9 | 8 . 2 |
+-----------------------+
|
Play this puzzle online at the Daily Sudoku site
| Code: | after basics
+--------------------------------------------------------------+
| 4 89 1 | 235 39 25 | 57 578 6 |
| 89 5 2 | 46 69 7 | 14 18 3 |
| 7 6 3 | 45 8 1 | 459 2 49 |
|--------------------+--------------------+--------------------|
| 23 34 9 | 8 5 6 | 1247 17 47 |
| 1 7 5 | 9 2 4 | 3 6 8 |
| 28 48 6 | 1 7 3 | 24 9 5 |
|--------------------+--------------------+--------------------|
| 359 39 8 | 2357 4 25 | 6 57 1 |
| 56 2 4 | 567 1 8 | 579 3 79 |
| 356 1 7 | 356 36 9 | 8 4 2 |
+--------------------------------------------------------------+
# 46 eliminations remain
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed Jul 14, 2010 5:39 pm Post subject: |
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Truly, I was only trying to extend the vertex of a potential xy-wing but I found this long horrible contradiction chain:
(4)r3c4-(4=6)r2c4-(6=9)r2c5-(9=8)r2c1-(8=2)r6c1-(2=3)r4c1-(3=4)r4c2-(4)r4c9=(4)r3c9-(4)r3c4; r3c4<>4
I will try to find a pattern solution later....
Ted |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed Jul 14, 2010 7:50 pm Post subject: |
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I also lucked out on my first more using a pattern.........
| Quote: | | xy-wing 14-8 with vertex (14)r2c7 and pseudocell (48)r6c17; r2c1<>8 |
Still another solution attempting to extend the vertex of a potential xy-wing 24-7.
| Quote: | | (7=4)r4c9-(4=2)r6c7-(2=8)r6c1-r2c1=(8-1)r2c8=(1)r4c8; r4c8<>7 |
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Jul 16, 2010 1:33 am Post subject: |
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W-Wing (57)
M-Wing (39)
UR (56), boxes 78, either DP killer solves box 9 the same way |
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