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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Mon Apr 25, 2011 11:09 pm Post subject: Puzzle 11/04/25: B Moderate (BBDB?) |
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| Code: | +-----------------------+
| 5 . 8 | 6 . 4 | . . . |
| . . . | . . . | . . 4 |
| 9 . . | 7 5 . | . 8 . |
|-------+-------+-------|
| 4 . 9 | 1 . 3 | 8 6 . |
| . . 6 | . 8 . | . 1 . |
| 8 . . | 4 . 6 | . . 2 |
|-------+-------+-------|
| . . . | 3 . . | 9 2 . |
| . . 2 | 9 4 . | 6 7 3 |
| . 9 . | . . 7 | . 4 . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Tue Apr 26, 2011 12:52 pm Post subject: |
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Loads of moves to play in this one - this path has just two wings...
| Quote: | m-wing(79) (7=9)r1c9 - r6c8=(9-7)r6c5=r4c5 ; r4c9<>7
l-wing(39) (9)r1c8=r6c8 - r6c5=r2c5 - (3)r2c5=r1c5 ; r1c8<>3 |
(Admit to spending more time finding a nice path than finding the patterns!) |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Apr 27, 2011 1:01 am Post subject: |
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Peter, nice catch on the Wings.
FWIW: This puzzle has one of those simple patterns ... that can be viewed as a more complex pattern ... that can be transformed into an even more complex pattern.
| Code: | after basics
+-----------------------------------------------------------------------+
| 5 1237 8 | 6 #1239 4 | 1237 g39 *179 |
| 2367 12367 137 | 28 g1239 1289 | 12357 359 4 |
| 9 1234 134 | 7 5 12 | 123 8 6 |
|-----------------------+-----------------------+-----------------------|
| 4 257 9 | 1 27 3 | 8 6 57 |
| 237 237 6 | 25 8 259 | 4 1 *79 |
| 8 157 157 | 4 *79 6 | 357 *359 2 |
|-----------------------+-----------------------+-----------------------|
| 67 45678 457 | 3 16 158 | 9 2 158 |
| 1 58 2 | 9 4 58 | 6 7 3 |
| 36 9 35 | 258 126 7 | 15 4 158 |
+-----------------------------------------------------------------------+
# 86 eliminations remain
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Simple pattern (*): 2-String Kite r6c9 => r1c5<>9
Complex pattern (*+#) + (g): Broken Wing w/guardians r1c8,r2c5 => r1c5,r2c8<>9
Transformed guardian cell: (9-3)r2c5 = r1c5 - (3=9)r1c8 => r1c8=9
Alternately:
| Code: | Skyscraper r25c6 => r1c9<>9
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(9-3)r2c5 = r1c5 - (3=9)r1c8 => r1c9<>9
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There's an extended almost M-Wing, but I think the other examples are enough.
Keith: Yes, I used a backdoor elimination. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Apr 27, 2011 4:41 am Post subject: |
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Numerous moves, as usual.
XY-Wing (275), flightless
Hidden UR (58)
M-Wing (79)
W-Wing (12)
DP (14-15-45)
XY-Chain |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Wed Apr 27, 2011 5:47 pm Post subject: |
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| daj95376 wrote: | | There's an extended almost M-Wing, but I think the other examples are enough. |
I think an almost-gm-wing is going to be a tough spot generally (for me)! Sky/turbot and w-/y- wings are not too bad, but I find spotting gm-wings hard enough never mind if one part of them is "almost"! |
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