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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Apr 17, 2009 1:44 pm Post subject: Set T_03 Puzzle 74 -- Advanced |
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| Code: | +-----------------------+
| 3 . 2 | . . 1 | . 6 . |
| . . 9 | . . . | . 1 2 |
| 8 1 . | 9 . . | . 7 . |
|-------+-------+-------|
| . . 6 | 1 . . | . . . |
| . . . | . 6 . | . 8 . |
| 1 . . | . . 9 | 6 . . |
|-------+-------+-------|
| . . . | . . 3 | 1 . . |
| 2 5 1 | . 9 . | . 4 8 |
| . 3 . | . . . | . 2 9 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
| Code: | turbot fish/ER c3b3 <> 5 [r6c9] extraneous
c26r4 Skyscraper <> 8 [r7c5],[r9c3]
r6 b5 Locked Candidate 2 <> 5 [r4c6],[r5c46]
XYZ-Wing [r4c2]/[r1c2]+[r6c3] <> 7 [r5c2]
XYZ-Wing [r4c2]/[r4c9]+[r6c3] <> 7 [r4c1] extraneous
Skyscraper r25c1 <> 7 [r1c4][r6c5]
XY-Wing [r1c4]/[r2c6]+[r9c4] <> 5 [r9c6] sufficient
XY-Wing [r2c6]/[r1c4]+[r9c6] <> 8 [r9c4]
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Last edited by daj95376 on Fri Apr 24, 2009 8:46 pm; edited 1 time in total |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sat Apr 18, 2009 11:21 pm Post subject: |
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| Code: | .------------------.------------------.------------------.
| 3 47 2 | 4578 4578 1 | 9 6 45 |
| 457 6 9 | 3 457 45 | 8 1 2 |
| 8 1 45 | 9 2 6 | 45 7 3 |
:------------------+------------------+------------------:
| 457 478 6 | 1 3 2458 | 245 9 457 |
| 4579 479 3 | 457 6 245 | 245 8 1 |
| 1 2 4578 | 4578 4578 9 | 6 3 457 |
:------------------+------------------+------------------:
| 479 4789 478 | 2 48 3 | 1 5 6 |
| 2 5 1 | 6 9 7 | 3 4 8 |
| 6 3 48 | 458 1 458 | 7 2 9 |
'------------------'------------------'------------------' |
skyscraper on 8
the next two chains are the same except one makes eliminations before moving on to make more in the second one.
(7=8)r6c3 - (8)r4c2 = (8)r4c6 - (8=5)r9c6 - (5)r2c6 = (5-7)r2c5 = (7)r2c1; r45c1 <> 7
(7=8)r6c3 - (8)r4c2 = (8)r4c6 - (8=5)r9c6 - (5)r2c6 = (5-7)r2c5 = (7)r2c1 - (7=9)r7c1 - (9)r7c2 = (9)r5c2; r5c2 <> 7
xy-wing {4,5,8} removes 5 from r9c6 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Mon Apr 20, 2009 12:58 pm Post subject: |
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I had to "work" on this since I could not find a non-chain solution. Three steps:
First, a Kraken x-wing 8 in r16c45 deletes 8 in r7c5.
Then I found a couple of deletions that lead nowhere so I started looking for a chain. After a lengthy time, I found a one that deletes 8 from r6c5. | Code: |
*-----------------------------------------------------------*
| 3 47 2 | 47-8 *78 1 | 9 6 5 |
| 47 6 9 | 3 *57 *45 | 8 1 2 |
| 8 1 5 | 9 2 6 | 4 7 3 |
|-------------------+-------------------+-------------------|
| 457 478 6 | 1 3 248 | 25 9 47 |
| 4579 479 3 | 47 6 24 | 25 8 1 |
| 1 2 78 | 4578 578 9 | 6 3 47 |
|-------------------+-------------------+-------------------|
| 79 789 78 | 2 4 3 | 1 5 6 |
| 2 5 1 | 6 9 7 | 3 4 8 |
| 6 3 4 | *58 1 *58 | 7 2 9 |
*-----------------------------------------------------------* |
(8=5)r9c4 - (5)r9c6 = (5)r2c6 - (5=7)r2c5 - (7=8)r1c5; r1c4<>8.
And finally, a xy-wing 478 with pivot 48 at r4c2 deletes 7 at r5c2, but transporting the 7 at r1c2 to r2c5 via r1c4 deletes 7 at r6c5 to finish off the puzzle.
Ted |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Mon Apr 20, 2009 6:42 pm Post subject: |
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| Code: | A w-wing, Skscrapers and xyz-wings led to this
.-------------.-------------.----------.
| 3 47 2 | 48 78 1 | 9 6 5 |
| 47 6 9 | 3 57 45 | 8 1 2 |
| 8 1 5 | 9 2 6 | 4 7 3 |
:-------------+-------------+----------:
| 5 78 6 | 1 3 48 | 2 9 47 |
| 49 49 3 | 7 6 2 | 5 8 1 |
| 1 2 78 | 458 58 9 | 6 3 47 |
:-------------+-------------+----------:
| 79 789 78 | 2 4 3 | 1 5 6 |
| 2 5 1 | 6 9 7 | 3 4 8 |
| 6 3 4 | 58 1 58 | 7 2 9 |
'-------------'-------------'----------'
w-wing 48 with 8 in row9 solves it |
dan |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Apr 22, 2009 4:57 am Post subject: |
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Took me seven steps. M (45), ER ( , XYZ (478), W (47), DP (25-24-45), Remote Pairs (47) and a finishing XY (487). |
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