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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sun Feb 07, 2010 6:07 pm Post subject: Puzzle 10/02/07 gM-Wing |
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In case you find some spare time. (Rated XY.)
| Code: | +-----------------------+
| 2 4 . | 8 . 5 | 1 6 . |
| 6 . . | 9 1 . | . . . |
| . . 8 | . . 6 | . . 5 |
|-------+-------+-------|
| 9 3 . | . 8 1 | . . . |
| . 6 . | 5 . . | . . . |
| 1 . 2 | 6 . 9 | . . . |
|-------+-------+-------|
| 5 . . | . . . | 8 3 . |
| 3 . . | . . . | 4 . . |
| . . 4 | . . . | . . 6 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Feb 07, 2010 11:37 pm Post subject: |
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I used three steps for this puzzle.
| Quote: | xy-wing 2-37 with vertex 27 in r2c6.
Kraken x-wing 7 in r29c67 with fin in r9c2: (9)r9c2 - r9c6 = r78c4 - r4c4 = r6c5; r6c7<>7,
flightless xy-wing 35-7 with vertex 35 in r6c7, pincer 57 in r6c8 and pincer 37 a pseudocell in r23c7 with pincer transport: (7)r2c7 - r2c6 = r1c5; r6c5<>7. |
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Feb 09, 2010 12:15 am Post subject: |
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| I used perhaps seven steps, depending on what counts as a step. The puzzle is labeled gM-Wing, although I didn't use one. However, an M-Wing with pincer transport was critical in setting up my ending moves of looking at the implications of a 79 UR. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Feb 10, 2010 5:08 pm Post subject: |
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Two steps: XY-Wing and gM-Wing.
| Code: | r16\c59 finned X-Wing <> 7 r4c9 extraneous
r2c5 2-String Kite <> 7 r6c7 extraneous
c67 X-Wing <> 7 r9c248 extraneous
<37+2> XY-Wing r1c5/r2c6+r5c5 <> 2 r3c5,r5c6
<27+3> XY-Wing r2c6/r1c5+r5c6 <> 3 r5c5 extraneous
gM-Wing: (3=4)r3c5 - r6c5 = (4-3)r6c9 = (3)r1c9 => r1c5,r3c7<>3
+-----------------------------------------------------+
| 2 4 9 | 8 37 5 | 1 6 37 |
| 6 5 3 | 9 1 27 | 27 4 8 |
| 7 1 8 | 24 34 6 | 23 9 5 |
|-----------------+-----------------+-----------------|
| 9 3 5 | 47 8 1 | 6 27 24 |
| 4 6 7 | 5 2 3 | 9 8 1 |
| 1 8 2 | 6 47 9 | 35 57 347 |
|-----------------+-----------------+-----------------|
| 5 279 16 | 127 69 4 | 8 3 279 |
| 3 279 16 | 127 569 8 | 4 257 279 |
| 8 29 4 | 3 59 27 | 57 1 6 |
+-----------------------------------------------------+
# 38 eliminations remain
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Feb 10, 2010 5:41 pm Post subject: |
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Couple of questions.
1. I know these terms are not definitive, but would you say that gM-Wings occur often, seldom, rarely or something else?
2. Is there some way of looking for them that is more efficient than looking at dozens of cells? |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Feb 10, 2010 6:27 pm Post subject: |
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| Marty R. wrote: | Couple of questions.
1. I know these terms are not definitive, but would you say that gM-Wings occur often, seldom, rarely or something else?
2. Is there some way of looking for them that is more efficient than looking at dozens of cells? |
This is only my opinion based on very limited experience with gM-Wings. I hope others will add their opinion as well.
1) I think gM-Wings occur often ... but are seldom found. Often, when a gM-Wing is present, an easier-to-find W-Wing is also present. When you have a case like this puzzle where there is only one productive gM-Wing present, it makes the puzzle extremely difficult to solve. Hence, the reason I added the gM-Wing warning to the title.
2) I don't know of any reasonable way to spot them; but, then again, I probably couldn't find an XYZ-Wing if my life depended upon it. Hence, the reason I add an alert to the body of puzzles with an XYZ-Wing.
Bottom Line: I previously announced that I was going to stop posting puzzles with gM-Wings. Arkietech/Dan mentioned something about wanting the puzzles to continue so he could practice looking for gM-Wings. Since (to me recollection) no one has supplied a gM-Wing solution to puzzles since Dan's comment, I'm going back to my original position.
This is the last puzzle of mine that needs a gM-Wing. If you'd like another gM-Wing to solve, send me a private message. They also appear to be a great source of puzzles that can be solved by any number of chains; i.e., a chain-rich environment.
Regards, Danny |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Feb 10, 2010 8:29 pm Post subject: |
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| Thanks for the response. Like Dan, I wouldn't mind getting in some practice in looking for them, especially if they occur fairly often. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Feb 10, 2010 10:29 pm Post subject: |
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| daj95376 wrote: | | Arkietech/Dan mentioned something about wanting the puzzles to continue so he could practice looking for gM-Wings. Since (to me recollection) no one has supplied a gM-Wing solution to puzzles since Dan's comment, |
I am still looking! My problem is I find something to solve the puzzle before I get to your wing.  I like your puzzles -- keep them coming. |
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