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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sun Jul 31, 2011 5:46 pm Post subject: Puzzle 11/07/31: ~ XY (very difficult!) |
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| Code: | +-----------------------+
| . 8 . | . . 9 | 4 1 . |
| 4 3 . | 6 . 1 | . . 9 |
| . . . | . . 4 | . . 6 |
|-------+-------+-------|
| . 7 . | 9 . 3 | . . . |
| . . . | . 8 . | . . 1 |
| 3 4 8 | 1 . . | 9 . . |
|-------+-------+-------|
| 8 . . | . . 2 | 6 . 5 |
| 6 . . | . . . | . . . |
| . 1 7 | . 9 . | 8 . . |
+-----------------------+
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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 Jul 31, 2011 9:15 pm Post subject: |
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| Code: | *--------------------------------------------------------------------*
| 7 8 6 | 235 235 9 | 4 1 23 |
| 4 3 25 | 6 27 1 | 257 8 9 |
| 19 25 19 | 8 237 4 | 2357 2357 6 |
|----------------------+----------------------+----------------------|
| 125 7 125 | 9 46 3 | 25 46 8 |
| 259 6 259 | 24 8 57 | 2357 23457 1 |
| 3 4 8 | 1 26 57 | 9 2567 27 |
|----------------------+----------------------+----------------------|
| 8 9 34 | 347 1 2 | 6 37 5 |
| 6 25 34 | 3457 345 8 | 1 9 2347 |
| 25 1 7 | 345 9 6 | 8 23 234 |
*--------------------------------------------------------------------* |
I started looking at 2s, and never stopped until the puzzle was solved.
Flightless m-wing: (2=5)r2c3-r3c2=(5=2)r8c2=r8c9-r1c9=r1c45; r2c5<>2
6-cell RP(25)r4c7+r2c7+r2c3+r3c2+r8c2+r9c1; r4c1<>25
coloring(2);r6c9<>2
Multi-coloring (2); r1c9<>2
xy-wing(24-5)r5c41+r9c4; r9c1<>5=2
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Aug 01, 2011 4:35 am Post subject: |
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XY-Wing (275); r6c8<>5
AIC; r4c1<>2 + transport; r6c9<>2
XY-Chain; r8c9<>3
XY-Wing (452); r5c1<>2 |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Mon Aug 01, 2011 11:08 am Post subject: |
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Digits 2 and 5 were certainly where the action was!
It would be a stretch to call this move a flightless s-wing with extended transport...
| Code: | | (2)r1c4=r5c4 - r6c5=r6c89 - (2=5)r4c7 - (5)r56c8=r3c8 - r3c2=r8c2 - r8c5=r1c5 ; r1c5<>2, r1c4<>5 |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Mon Aug 01, 2011 1:00 pm Post subject: |
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| peterj wrote: | It would be a stretch to call this move a flightless s-wing with extended transport...
| Code: | | (2)r1c4=r5c4 - r6c5=r6c89 - (2=5)r4c7 - (5)r56c8=r3c8 - r3c2=r8c2 - r8c5=r1c5 ; r1c5<>2, r1c4<>5 |
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Not a stretch, even extended s-wing would be OK in my opinion. Do we use different names for a remote pair of four cells and one with six cells?
Nice find ... whatever the name. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Mon Aug 01, 2011 2:00 pm Post subject: |
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Peter, very nice find indeed 
Ron, I try to stay out of terminology issues and do not usually post names except for the basic patterns. I also provide more info about a basic pattern such, as "6-cell RP(25)r4c7+r2c7+r2c3+r3c2+r8c2+r9c1; r4c1<>25". Hopefully, if I provide sufficient detail, a move is then understandable and the name is irrelevant.
Ted |
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