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gohast
Joined: 26 Sep 2006
Posts: 18
Location: Dublin, Ireland
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 Posted: Tue Apr 01, 2008 11:34 pm Post subject: Wed Apr 2 VH |
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| A type 4 UR and then an XY wing. Enjoyed that! |
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prakash
Joined: 02 Jan 2008
Posts: 67
Location: New Jersey, USA
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| Posted: Tue Apr 01, 2008 11:41 pm Post subject: |
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Very straightforward, The the 148 XY wing cracks the puzzle wide open. Still don't see the UR
| Code: |
+------------+--------------+-------------+
| 258 158 3 | 18 4 9 | 7 28 6 |
| 48 67 67 | 2 35 35 | 489 1 49 |
| 248 9 14 | 168 168 7 | 3 248 5 |
+------------+--------------+-------------+
| 489 68 69 | 478 278 24 | 1 5 3 |
| 3 2 14 | 5 18 6 | 48 9 7 |
| 7 18 5 | 9 1238 234 | 6 24-8 24 |
+------------+--------------+-------------+
| 1 3 8 | 47 257 245 | 249 6 249 |
| 59 57 79 | 46 26 8 | 24 3 1 |
| 6 4 2 | 3 9 1 | 5 7 8 |
+------------+--------------+-------------+
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Kdelle
Joined: 20 Mar 2008
Posts: 59
Location: Hudson, NH
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| Posted: Wed Apr 02, 2008 5:26 am Post subject: |
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| I'm not familiar with all the URs, but I think there's one on 49 in R27C79. |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Wed Apr 02, 2008 5:53 am Post subject: |
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| prakash wrote: | | Very straightforward, The the 148 XY wing cracks the puzzle wide open. |
I agree. BTW, The xy wing solves r6c8=4 immediately, since 2 in col 8 is confined to box 1. |
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ravel
Joined: 21 Apr 2006
Posts: 536
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| Posted: Wed Apr 02, 2008 10:35 am Post subject: |
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| Kdelle wrote: | | I'm not familiar with all the URs, but I think there's one on 49 in R27C79. |
Funny, its the same i had in the "Other puzzles" forum today.
| Code: | +------------+--------------+-------------+
| 258 158 3 | 18 4 9 | 7 28 6 |
| 48 67 67 | 2 35 35 |#489 1 #49 |
| 248 9 14 | 168 168 7 | 3 248 5 |
+------------+--------------+-------------+
| 489 68 69 | 478 278 24 | 1 5 3 |
| 3 2 14 | 5 18 6 | 48 9 7 |
| 7 18 5 | 9 1238 234 | 6 248 24 |
+------------+--------------+-------------+
| 1 3 8 | 47 257 245 |#249 6 #249 |
| 59 57 79 | 46 26 8 | 24 3 1 |
| 6 4 2 | 3 9 1 | 5 7 8 |
+------------+--------------+-------------+ |
Because 9 is an x-wing, you can eliminate 4 from r7c7 (it would imply that both r2c7 and r7c9 are 9 and r2c9 4 again).
Since r2c7=4 implies r7c9=4 (via r78c7<>4) and thus r7c7=9 and r2c9=9, 4 can be eliminated from r2c7 also. |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Wed Apr 02, 2008 12:22 pm Post subject: |
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A jolly good sudoku!!
I found an ER solution using the two 4s in C2 and the hinge in Box 6. This gets rid of the 4 in R3C8.
After that: - "Bob's your uncle". |
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sdq_pete
Joined: 30 Apr 2007
Posts: 119
Location: Rotterdam, NL
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| Posted: Wed Apr 02, 2008 2:41 pm Post subject: |
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According to my Uncle Bob, there's a simple X-wing on 2's eliminating 2 from R6C8, and it was pretty plain sailing after that too.
Peter |
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TexCat
Joined: 07 Jul 2006
Posts: 32
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| Posted: Wed Apr 02, 2008 3:34 pm Post subject: |
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| My Uncle Bob found the 18 w-wing pretty quickly and then it was as easy as Aunt Sue's pie. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Apr 02, 2008 3:47 pm Post subject: |
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| I used the W-Wing on 18 and the Type 1 UR on 49. |
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ravel
Joined: 21 Apr 2006
Posts: 536
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| Posted: Wed Apr 02, 2008 4:23 pm Post subject: |
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| Just saw now, that in prakash's grid, which i had looked at for the UR, the 2 can be placed in r6c9, because it is locked to box 3 in column 8. Then you have the type 4 UR with the same eliminations as above (r27c8<>4) |
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Victor
Joined: 29 Sep 2005
Posts: 207
Location: NI
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| Posted: Wed Apr 02, 2008 4:58 pm Post subject: |
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| Or, type 4 followed by colouring in 4s to eliminate the 4 in r3c8: but the ER is nicer. & I think that's capped by the W-wing. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Wed Apr 02, 2008 7:42 pm Post subject: |
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xy-wing {1,4,8} for me as well. was a little distracted because Ms. Clinton was in town today and was keeping an ear to the scanner as she was speaking at york college, only a block from my childhood neighborhood.
26 min online time to complete. |
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