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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Wed Dec 23, 2009 4:22 pm Post subject: Puzzle XY 09/12/23 |
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| Code: | +-----------------------+
| . . . | 4 . 6 | 9 . . |
| . 3 . | 9 5 . | . . . |
| . . . | . . 3 | . . . |
|-------+-------+-------|
| 1 6 . | 7 . . | . 9 2 |
| . 8 . | . . 4 | . . . |
| 3 . 4 | . 9 . | 1 . . |
|-------+-------+-------|
| 4 . . | . . 9 | 6 . . |
| . . . | 6 . . | . 3 8 |
| . . . | 5 . . | . 4 . |
+-----------------------+
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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: Wed Dec 23, 2009 7:26 pm Post subject: |
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My two steps were
| Quote: | x-wing 5 in r38c17,
xy-wing 12-7 plus a transport.
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Ted |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Dec 23, 2009 11:55 pm Post subject: |
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I used | Quote: | | same as Ted's only needed a skyscraper 7 to set up xy-wing 127 |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Dec 24, 2009 5:27 am Post subject: |
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| Code: | +----------------------+----------------+-----------------+
| 8 125 127 | 4 127 6 | 9 1257 3 |
| 7(2) 3 16 | 9 5 7(2) | 8 16 4 |
| 7-2(59) 4 12679 | 8 127 3 | 257 12567 157 |
+----------------------+----------------+-----------------+
| 1 6 5 | 7 3 8 | 4 9 2 |
| -2(9) 8 29 | 1 6 4 | 3 57 57 |
| 3 7 4 | 2 9 5 | 1 8 6 |
+----------------------+----------------+-----------------+
| 4 (25) 8 | 3 7(2) 9 | 6 1257 157 |
| 27(5) 9 127 | 6 4 1(2) | 25 3 8 |
| 6 12 3 | 5 8 17(2) | 27 4 9 |
+----------------------+----------------+-----------------+ |
(2)r2c1 = (2)r2c5 - (2)r89c6 = (2)r7c5 - (2=5)r7c2 - (5)r8c1 = (5-9)r3c1 = (9)r5c1
r3c1 <> 2
r5c1 <> 2
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Thu Dec 24, 2009 5:47 am Post subject: |
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| storm_norm wrote: | (2)r2c1 = (2)r2c5 - (2)r89c6 = (2)r7c5 - (2=5)r7c2 - (5)r8c1 = (5-9)r3c1 = (9)r5c1
r3c1 <> 2
r5c1 <> 2
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Interesting use of a chain, Norm. Since I'm up to my eyeballs writing an updated chain module for my solver, I actually debated an implementation that would support compound chains such as yours. Of course, one is left with the dilemma of just how far to carry a compound chain.
(2)r2c1 = (2)r2c5 - (2)r89c6 = (2)r7c5 - (2=5)r7c2 - (5)r8c1 = (5-9)r3c1 = (9)r5c1 - (9=2)r5c3
r3c1 <> 2
r5c1 <> 2
r13c3 <> 2 |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Dec 24, 2009 7:15 am Post subject: |
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| daj95376 wrote: | | storm_norm wrote: | (2)r2c1 = (2)r2c5 - (2)r89c6 = (2)r7c5 - (2=5)r7c2 - (5)r8c1 = (5-9)r3c1 = (9)r5c1
r3c1 <> 2
r5c1 <> 2
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Interesting use of a chain, Norm. Since I'm up to my eyeballs writing an updated chain module for my solver, I actually debated an implementation that would support compound chains such as yours. Of course, one is left with the dilemma of just how far to carry a compound chain.
(2)r2c1 = (2)r2c5 - (2)r89c6 = (2)r7c5 - (2=5)r7c2 - (5)r8c1 = (5-9)r3c1 = (9)r5c1 - (9=2)r5c3
r3c1 <> 2
r5c1 <> 2
r13c3 <> 2 |
I can only suggest far enough to solve the puzzle. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Thu Dec 24, 2009 10:58 am Post subject: |
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| storm_norm wrote: | (2)r2c1 = (2)r2c5 - (2)r89c6 = (2)r7c5 - (2=5)r7c2 - (5)r8c1 = (5-9)r3c1 = (9)r5c1
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I like it!  |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Dec 24, 2009 4:32 pm Post subject: |
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Type 4 UR (29)
ER (7)
X-Wing (5)
XY-Wing (127) with pincer transport |
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