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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Sat Oct 24, 2009 4:01 pm Post subject: October 24 DB |
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I found the October 24 DB challenging. Norm, please find a silver bullet.
A Multistep Solution: Color 2,Color 8, 2&8 X wing, 248 xy-wing
Earl
| Code: |
+-------+-------+-------+
| 6 . . | . . 1 | 3 . 5 |
| . . 3 | . . . | 9 7 . |
| . . . | 6 9 . | . 8 . |
+-------+-------+-------+
| . . 1 | . . 5 | . . 9 |
| . . . | 4 2 9 | . . . |
| 9 . . | 3 . . | 6 . . |
+-------+-------+-------+
| . 6 . | . 3 2 | . . . |
| . 7 4 | . . . | 1 . . |
| 2 . 9 | 5 . . | . . 3 |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site |
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Louise56
Joined: 21 Sep 2005
Posts: 94
Location: El Cajon, California USA
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| Posted: Sat Oct 24, 2009 4:12 pm Post subject: |
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I can't solve it. If someone posts how they solved it, please give a good explanation. Thanks.  |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sat Oct 24, 2009 5:23 pm Post subject: |
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basics consist of all singles, then one intersection.
| Code: | +-------------------+---------------+----------------+
| 6 9 28 | 278 47 1 | 3 24 5 |
| 1 248 3 | 28 5 48 | 9 7 6 |
| 457 245 257 | 6 9 3 | 24 8 1 |
+-------------------+---------------+----------------+
| 478 248 1 | 78 6 5 | 247 3 9 |
| (78) 3 6 | 4 2 9 | 5 1 7(8) |
| 9 2458 258-7 | 3 1 (78) | 6 24 47(8) |
+-------------------+---------------+----------------+
| 58 6 58 | 1 3 2 | 47 9 47 |
| 3 7 4 | 9 8 6 | 1 5 2 |
| 2 1 9 | 5 47 47 | 8 6 3 |
+-------------------+---------------+----------------+ |
this w-wing removes the 7 in r6c3
then it doesn't matter which x-wing on 2 you use.
I am going to use...
| Code: | +-------------------+--------------+----------------+
| 6 9 8(2) | 78-2 47 1 | 3 4(2) 5 |
| 1 248 3 | 28 5 48 | 9 7 6 |
| 45 245 7 | 6 9 3 | 24 8 1 |
+-------------------+--------------+----------------+
| 478 248 1 | 78 6 5 | 247 3 9 |
| 78 3 6 | 4 2 9 | 5 1 78 |
| 9 458-2 58(2) | 3 1 78 | 6 4(2) 478 |
+-------------------+--------------+----------------+
| 58 6 58 | 1 3 2 | 47 9 47 |
| 3 7 4 | 9 8 6 | 1 5 2 |
| 2 1 9 | 5 47 47 | 8 6 3 |
+-------------------+--------------+----------------+ |
| Code: | +----------------+----------------+--------------+
| 6 9 28 | 7(8) 47 1 | 3 24 5 |
| 1 4(8) 3 | 2 5 4(8) | 9 7 6 |
| 45 245 7 | 6 9 3 | 24 8 1 |
+----------------+----------------+--------------+
| 478 24-8 1 | 7(8) 6 5 | 247 3 9 |
| 78 3 6 | 4 2 9 | 5 1 78 |
| 9 458 258 | 3 1 78 | 6 24 478 |
+----------------+----------------+--------------+
| 58 6 58 | 1 3 2 | 47 9 47 |
| 3 7 4 | 9 8 6 | 1 5 2 |
| 2 1 9 | 5 47 47 | 8 6 3 |
+----------------+----------------+--------------+ |
kite removes 8 from r4c2
| Code: | +-----------------+------------+--------------+
| 6 9 (28) | 78 47 1 | 3 24 5 |
| 1 (48) 3 | 2 5 48 | 9 7 6 |
| 45 45-2 7 | 6 9 3 | 24 8 1 |
+-----------------+------------+--------------+
| 478 (24) 1 | 78 6 5 | 247 3 9 |
| 78 3 6 | 4 2 9 | 5 1 78 |
| 9 458 58-2 | 3 1 78 | 6 24 478 |
+-----------------+------------+--------------+
| 58 6 58 | 1 3 2 | 47 9 47 |
| 3 7 4 | 9 8 6 | 1 5 2 |
| 2 1 9 | 5 47 47 | 8 6 3 |
+-----------------+------------+--------------+ |
xy-wing removes 2 from r6c3 and r3c2 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Oct 24, 2009 9:05 pm Post subject: |
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I used three colorings and three XY-Wings, the last of which required pincer transport.
Louise, can you post the position you got stuck at if you need more information? |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sat Oct 24, 2009 9:52 pm Post subject: |
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| Louise56 wrote: | I can't solve it. If someone posts how they solved it, please give a good explanation. Thanks.
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Essentially identical to Earl's solution.
| Code: | +-----------------------+
| 6 . . | . . 1 | 3 . 5 |
| . . 3 | . . . | 9 7 . |
| . . . | 6 9 . | . 8 . |
|-------+-------+-------|
| . . 1 | . . 5 | . . 9 |
| . . . | 4 2 9 | . . . |
| 9 . . | 3 . . | 6 . . |
|-------+-------+-------|
| . 6 . | . 3 2 | . . . |
| . 7 4 | . . . | 1 . . |
| 2 . 9 | 5 . . | . . 3 |
+-----------------------+
r1 b2 Locked Candidate 1 <> 7 r1c3
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| Code: | finned X-Wing r34\c27 w/fin cell [r3c3] => [r2c2]<>2
+--------------------------------------------------------------+
| 6 9 28 | 278 47 1 | 3 24 5 |
| 1 48-2 3 | 28 5 48 | 9 7 6 |
| 457 *245 #257 | 6 9 3 | *24 8 1 |
|--------------------+--------------------+--------------------|
| 478 *248 1 | 78 6 5 | *247 3 9 |
| 78 3 6 | 4 2 9 | 5 1 78 |
| 9 2458 2578 | 3 1 78 | 6 24 478 |
|--------------------+--------------------+--------------------|
| 58 6 58 | 1 3 2 | 47 9 47 |
| 3 7 4 | 9 8 6 | 1 5 2 |
| 2 1 9 | 5 47 47 | 8 6 3 |
+--------------------------------------------------------------+
# 41 eliminations remain
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| Code: | 2-String Kite r2c4 => [r4c2]<>8
+--------------------------------------------------------------+
| 6 9 28 | *78 47 1 | 3 24 5 |
| 1 *48 3 | 2 5 *48 | 9 7 6 |
| 457 245 257 | 6 9 3 | 24 8 1 |
|--------------------+--------------------+--------------------|
| 478 24-8 1 | *78 6 5 | 247 3 9 |
| 78 3 6 | 4 2 9 | 5 1 78 |
| 9 2458 2578 | 3 1 78 | 6 24 478 |
|--------------------+--------------------+--------------------|
| 58 6 58 | 1 3 2 | 47 9 47 |
| 3 7 4 | 9 8 6 | 1 5 2 |
| 2 1 9 | 5 47 47 | 8 6 3 |
+--------------------------------------------------------------+
# 38 eliminations remain
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| Code: | X-Wing c26\r26 => [r6c39]<>8
+--------------------------------------------------------------+
| 6 9 28 | 78 47 1 | 3 24 5 |
| 1 *48 3 | 2 5 *48 | 9 7 6 |
| 457 245 257 | 6 9 3 | 24 8 1 |
|--------------------+--------------------+--------------------|
| 478 24 1 | 78 6 5 | 247 3 9 |
| 78 3 6 | 4 2 9 | 5 1 78 |
| 9 *2458 257-8 | 3 1 *78 | 6 24 47-8 |
|--------------------+--------------------+--------------------|
| 58 6 58 | 1 3 2 | 47 9 47 |
| 3 7 4 | 9 8 6 | 1 5 2 |
| 2 1 9 | 5 47 47 | 8 6 3 |
+--------------------------------------------------------------+
# 37 eliminations remain
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| Code: | XY-Wing [r2c2]/[r1c3]+[r4c2] => [r3c2],[r6c3]<>2
+--------------------------------------------------------------+
| 6 9 *28 | 78 47 1 | 3 24 5 |
| 1 *48 3 | 2 5 48 | 9 7 6 |
| 45 45-2 7 | 6 9 3 | 24 8 1 |
|--------------------+--------------------+--------------------|
| 48 *24 1 | 78 6 5 | 247 3 9 |
| 7 3 6 | 4 2 9 | 5 1 8 |
| 9 2458 5-2 | 3 1 78 | 6 24 47 |
|--------------------+--------------------+--------------------|
| 58 6 58 | 1 3 2 | 47 9 47 |
| 3 7 4 | 9 8 6 | 1 5 2 |
| 2 1 9 | 5 47 47 | 8 6 3 |
+--------------------------------------------------------------+
# 28 eliminations remain
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An interesting puzzle that doesn't seem to give. At the point of the finned X-Wing, there's a finned Sashimi Swordfish => [r5c1],[r6c3]<>8. Unfortunately, it doesn't lead to a shortcut to the XY-Wing.  |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Oct 25, 2009 6:29 pm Post subject: |
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My steps were somewhat different that those already posted, but I still needed four to complete the puzzle.
a xy-wing -248 with one pincer extended,
a useless w-wing 78 with grouped strong link 8 that results in a deletion by transporting one pincer,
a useless xy-wing 45-8 becomes useful by transporting one pincer,
a xy-wing 24-7 using a pseudocell for one of the pincers.
Yes, it had the feeling of a "Bend But Don't Break" (BBDB) puzzle.
Ted |
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Louise56
Joined: 21 Sep 2005
Posts: 94
Location: El Cajon, California USA
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| Posted: Mon Oct 26, 2009 11:03 pm Post subject: |
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| Thanks to all of you for providing your solutions with explanations, I know it's a lot of work to do that, but it is helpful to all of us intermediated puzzlers. I was stuck where storm_norm did the w-wing. Thanks again. |
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