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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Sat Aug 29, 2009 3:02 pm Post subject: Aug 29 DB |
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The August 29 DB is a challenge. Maybe Norm will find a single bullet, but I needed a double-barreled shot gun.
A Solution: color in 4, then four xy-wings: 348, 389, 389, 248.
Earl
| Code: |
+-------+-------+-------+
| 1 . . | 5 . . | 2 . 6 |
| 9 . . | . 1 . | 5 . . |
| 2 . 5 | . . . | . 8 9 |
+-------+-------+-------+
| . . . | . 5 4 | . . . |
| 4 . . | . . . | . . 5 |
| . . . | 2 7 . | . . . |
+-------+-------+-------+
| 3 6 . | . . . | 9 . 1 |
| . . 1 | . 6 . | . . 2 |
| 5 . 8 | . . 7 | . . 3 |
+-------+-------+-------+
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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
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| Posted: Sat Aug 29, 2009 4:55 pm Post subject: |
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Enjoyable puzzle.
My four steps were:
| Quote: | | XYZ (348), ER (4), XY (384) with pincer transport and W (48) |
Last edited by Marty R. on Sun Aug 30, 2009 3:27 am; edited 2 times in total |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sat Aug 29, 2009 7:05 pm Post subject: |
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maybe if I give it more time I can find the silver bullet.
for now I like the coloring on 4
which leads to
| Code: | .------------------.------------------.------------------.
| 1 *3478 *347 | 5 3489 389 | 2 34 6 |
| 9 *348 6 |3-8 1 2 | 5 34 7 |
| 2 34 5 | 7 34 6 | 1 8 9 |
:------------------+------------------+------------------:
| 6 1237 2379 | 39 5 4 | 37 129 8 |
| 4 1237 2379 | 6 389 1389 | 37 129 5 |
| 8 5 39 | 2 7 139 | 6 19 4 |
:------------------+------------------+------------------:
| 3 6 *24 |*48 28 5 | 9 7 1 |
| 7 49 1 | 349 6 39 | 8 5 2 |
| 5 29 8 | 1 29 7 | 4 6 3 |
'------------------'------------------'------------------' |
(8)r2c2 = (8-7)r1c2 = (7-4)r1c3 = (4)r7c3 - (4=8)r7c4; r2c4 <> 8 |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Aug 29, 2009 10:02 pm Post subject: |
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I attacked the 4's. First, a skyscraper, then two XY-wings plus pincer coloring on both. Skyscraper R38: | Code: | +----------------+----------------+----------------+
| 1 3478 347 | 5 3489 389 | 2 34 6 |
| 9 348 6 |3-48 1 2 | 5 34 7 |
| 2 34b 5 | 7 34B 6 | 1 8 9 |
+----------------+----------------+----------------+
| 6 1237 2379 | 39 5 4 | 37 129 8 |
| 4 1237 2379 | 6 389 1389 | 37 129 5 |
| 8 5 39 | 2 7 139 | 6 19 4 |
+----------------+----------------+----------------+
| 3 6 24 | 48 2-48 5 | 9 7 1 |
| 7 49a 1 | 349A 6 39 | 8 5 2 |
| 5 29 8 | 1 29 7 | 4 6 3 |
+----------------+----------------+----------------+ |
Then, an XY-wing with coloring: | Code: | +----------------+----------------+----------------+
| 1 3478 347# | 5 3-489 389 | 2 34 6 |
| 9 348 6 | 38* 1 2 | 5 34 7 |
| 2 3-4 5 | 7 34* 6 | 1 8 9 |
+----------------+----------------+----------------+
| 6 1237 2379 | 39 5 4 | 37 129 8 |
| 4 1237 2379 | 6 389 1389 | 37 129 5 |
| 8 5 39 | 2 7 139 | 6 19 4 |
+----------------+----------------+----------------+
| 3 6 24# | 48* 28 5 | 9 7 1 |
| 7 49 1 | 349 6 39 | 8 5 2 |
| 5 29 8 | 1 29 7 | 4 6 3 |
+----------------+----------------+----------------+ |
and the other XY-wing with coloring | Code: | +----------------+----------------+----------------+
| 1 478 47# | 5 389 389 | 2 3-4 6 |
| 9 -48 6 | 38* 1 2 | 5 34* 7 |
| 2 3 5 | 7 4 6 | 1 8 9 |
+----------------+----------------+----------------+
| 6 127 2379 | 39 5 4 | 37 129 8 |
| 4 127 2379 | 6 389 1389 | 37 129 5 |
| 8 5 39 | 2 7 139 | 6 19 4 |
+----------------+----------------+----------------+
| 3 6 24# | 48* 28 5 | 9 7 1 |
| 7 49 1 | 349 6 39 | 8 5 2 |
| 5 29 8 | 1 29 7 | 4 6 3 |
+----------------+----------------+----------------+ |
Keith |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Aug 30, 2009 3:22 am Post subject: |
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My three steps were an ER on 4 with hinge in box7 and strong link in row 3 (which was the same as the skyscraper),
xy-wing 38-4 with pivot 38 in r2c4 and the 4 in pincer at r7c4 transported to r8c2 via r8c4,
w-wing 48 with pincers in r2c2 & r7c4 and strong link 4 in col3.
And yes, a nice puzzle.
Ted |
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