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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Tue Apr 14, 2009 6:57 am Post subject: Set XY_01 Puzzle 88 -- Advanced |
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Last puzzle of the set.
| Code: | +-----------------------+
| . . 3 | . 6 . | . . . |
| . . 6 | 1 . . | 7 . . |
| 4 1 . | . . . | . 6 8 |
|-------+-------+-------|
| . 5 . | 4 . 3 | 2 . . |
| 3 . . | . 8 . | . . . |
| . . . | 2 . . | . 8 . |
|-------+-------+-------|
| . 4 . | 9 . . | 6 5 . |
| . . 1 | . . 4 | 8 2 . |
| . . 8 | . . . | . . 9 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
| Code: | r7 b7 Locked Pair <> 27 [r7c59],[r8c12],[r9c12]
b3 Naked Pair <> 39 [r1c78],[r2c9]
r3 b2 Locked Triple <> 237 [r12c6]
c1 Naked Triple <> 279 [r8c1]
c6b2 Locked Pair <> 59 [r569c6]
r6 Naked Pair <> 67 [r6c359]
Skyscraper r47c5 <> 1 [r5c9],[r9c8]
W-Wing: 4/1 in r1c8,r9c7 connected by 1 in r17c9 => r1c7,r9c8<>4
+--------------------------------------------------------------+
| 279 27 3 | 8 6 59 | 145 14 1245 |
| 29 8 6 | 1 4 59 | 7 3 25 |
| 4 1 5 | 37 237 27 | 9 6 8 |
|--------------------+--------------------+--------------------|
| 8 5 79 | 4 179 3 | 2 179 6 |
| 3 267 2479 | 567 8 167 | 145 1479 457 |
| 1 67 49 | 2 59 67 | 3 8 45 |
|--------------------+--------------------+--------------------|
| 27 4 27 | 9 13 8 | 6 5 13 |
| 56 9 1 | 3567 357 4 | 8 2 37 |
| 56 3 8 | 567 1257 1267 | 14 47 9 |
+--------------------------------------------------------------+
# 65 eliminations remain
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Last edited by daj95376 on Mon Apr 20, 2009 8:53 am; edited 1 time in total |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue Apr 14, 2009 10:24 pm Post subject: |
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Well, this puzzle beat me. As advertised, it could/did contain a chain that I was not able to find. I know this because I finally gave up and ran "Sudoku Susser".
Did anyone else find a solution without a chain?
Ted |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Tue Apr 14, 2009 10:48 pm Post subject: |
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| Quote: | | Did anyone else find a solution without a chain? |
no, but I didn't search for everything.
| Code: | .------------------.------------------.------------------.
| 279 27 3 | 8 6 59 |H1-45 A14 1245 |
| 29 8 6 | 1 4 59 | 7 3 25 |
| 4 1 5 | 37 237 27 | 9 6 8 |
:------------------+------------------+------------------:
| 8 5 79 | 4 C179 3 | 2 B179 6 |
| 3 267 2479 | 567 8 167 | 145 1479 1457 |
| 1 67 49 | 2 59 67 | 3 8 45 |
:------------------+------------------+------------------:
| 27 4 27 | 9 D13 8 | 6 5 E13 |
| 56 9 1 | 3567 357 4 | 8 2 37 |
| 56 3 8 | 567 1257 1267 |F14 G1-47 9 |
'------------------'------------------'------------------' |
(4=1)A - (1)B = (1)C - (1=3)D - (3=1)E - (1=4)F; G and H not 4
skyscraper 1: r4c8 = r4c5 - r7c5 = r7c9; r5c9 and G not 1 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Tue Apr 14, 2009 11:13 pm Post subject: |
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If Norm had performed his Skyscraper eliminations first, then a <14> W-Wing would have been exposed to get around a 4-cell XY-Chain.
Aside Note: Except for a couple of puzzles in this set, all of the XY-Chains can be circumvented with either W-Wing(s) or a UR. Some puzzles could be cracked using either alternative.  |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue Apr 14, 2009 11:33 pm Post subject: |
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| daj95376 wrote: | | If Norm had performed his Skyscraper eliminations first, then a <14> W-Wing would have been exposed to get around a 4-cell XY-Chain. |
Now I am embarrassed since I did perform the skyscrapter first, but missed the w-wing. 
Ted |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Wed Apr 15, 2009 12:10 am Post subject: |
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| tlanglet wrote: | | daj95376 wrote: | | If Norm had performed his Skyscraper eliminations first, then a <14> W-Wing would have been exposed to get around a 4-cell XY-Chain. |
Now I am embarrassed since I did perform the skyscrapter first, but missed the w-wing.
Ted |
hmmm. no points for us. |
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