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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Apr 16, 2010 7:51 am Post subject: Puzzle 10/04/16 ___ BBDB |
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| Code: | +-----------------------+
| 8 . . | 2 . 7 | . 5 . |
| . . 2 | . 1 . | . . 7 |
| . 3 . | . . 5 | . . . |
|-------+-------+-------|
| 2 . . | 1 . . | 8 9 . |
| . 4 . | . 9 . | 7 . . |
| 6 . 9 | . . 4 | . 3 . |
|-------+-------+-------|
| . . . | 5 2 . | . . . |
| 5 . . | 4 . 3 | . 7 . |
| . 6 . | . . . | . . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Fri Apr 16, 2010 11:22 am Post subject: |
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Symmetrical three step:
| Quote: | 1)XY Wing <138> blocks 4&5
2)Clunky AIC that proves r1c2 must be 1
(1=9)r1c2-(9=1)r7c2-r8c3=(19)r8c79-(1)r79c8=r3c8-r1c79=r1c2
When r1c2 is set to 9 (or not 1) it becomes 1 so r1c2 = 1
Here's a picture if it's useful - green "is 1", orange "isn't 1" http://i39.tinypic.com/drf48n.jpg
3)XY Wing <138> blocks 7&9 |
Last edited by Mogulmeister on Sun Apr 18, 2010 9:58 am; edited 1 time in total |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Fri Apr 16, 2010 12:39 pm Post subject: |
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Three steps - after each I thought it was broken | Quote: | xy-wing 138
w-wing 18
remote pair 19
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Good bbdb Danny  |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Apr 16, 2010 6:08 pm Post subject: |
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| Hint wrote: | Finding a (grouped) 2-String Kite makes life a lot easier.
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Apr 16, 2010 10:10 pm Post subject: |
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I had four moves including one rare event for me.
Type 6 UR78: UR78[(9)r9c4 = (5)r6c5]r69c45 - (5=3)r4c5 - (3=4)r1c5 - (4=8)r3c5 - (8=9)r2c6; r23c4<>9,
xy-wing 13-8 with vertex in r5c1; r5c3|r6c5<>8
Finned skyscraper on 1 in r7c28 with fin in r9c8
If skyscraper is true: r1c79|r3c3<>1
If fin is true: (1)r9c8 - r8c79 = (1)r8c3; r3c3<>1
Thus, r3c3<>1.
Another xy-wing 13-8 with vertex 13 in r9c1; r8c9<>8.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Apr 17, 2010 10:22 pm Post subject: |
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I used:
XY-Wing (894)
Type 6 UR (78)
XY-Wing (138)
W-Wing (18) + pincer transport
Simple coloring (1) |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sun Apr 18, 2010 9:17 am Post subject: |
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Danny, went back to look at your hint - it took me a lot of moves first time through.
That is a very nice grouped kite - I don't remember seeing one in the wild before! I have been trying to supplement my usual colouring with some more 'grouped colouring' steps - with mixed results, though they occasionally catch 'finned fish' which I might not notice without the discipline of colouring... |
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