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LA Times / Freep Fri Mar 14

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Fri Mar 14, 2008 7:45 pm    Post subject: LA Times / Freep Fri Mar 14 Reply with quote

This week's puzzle:

Code:
Puzzle: FP031408
+-------+-------+-------+
| 9 1 . | . . 5 | 8 . 6 |
| . . 8 | . 6 . | . 5 . |
| . . . | . . 1 | . . . |
+-------+-------+-------+
| . . . | 1 7 . | . . . |
| . 7 5 | 6 . 9 | 4 3 . |
| . . . | . 2 3 | . . . |
+-------+-------+-------+
| . . . | 3 . . | . . . |
| . 3 . | . 1 . | 5 . . |
| 1 . 6 | 4 . . | . 9 7 |
+-------+-------+-------+

Keith
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Fri Mar 14, 2008 8:22 pm    Post subject: Reply with quote

A solution can be seen in this thread:

http://www.dailysudoku.com/sudoku/forums/viewtopic.php?p=10365

Keith
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Victor



Joined: 29 Sep 2005
Posts: 207
Location: NI

PostPosted: Fri Mar 14, 2008 8:43 pm    Post subject: Reply with quote

Good practice in 'the basics' - like the good old days when many of us didn't use candidate numbers. A kite in 4s finished it for me (r7 + c8), tho' there are no doubt lots of other colouring moves.

PS. will have a look at your grids later - seem interesting.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sat Mar 15, 2008 12:17 am    Post subject: Reply with quote

I took out a 6 from the 68 UR, then colored on 2, then finished it off with a W-Wing on 24. There's also a 24-28-48 XY-Wing with pincer coloring that looks like it will also complete it.
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Johan



Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium

PostPosted: Sat Mar 15, 2008 9:35 am    Post subject: Reply with quote

A Type6 UR* in R46C18 takes out <2> in R2C2, either R6C1=4 or R4C8=2 to avoid the [68] DP
R6C1=|4| => R8C1=|8| => R9C2=|2|(a)
R4C8={2} => R2C9={2}(b)

Code:
+-------------------------+-------------------------+-------------------------+
| 9         1         47  | 2         3        5    | 8         47        6   |
| 3       -[2]4       8   | 9         6        7    | 1         5      b {2}4 |
| 5         6         27  | 8         4        1    | 9         27        3   |
+-------------------------+-------------------------+-------------------------+
|*68        9         3   | 1         7        4    | 26      *{2}68      5   |
| 2         7         5   | 6         8        9    | 4         3         1   |
|*|4|68     48        1   | 5         2        3    | 7        *68        9   |
+-------------------------+-------------------------+-------------------------+
| 7         5         24  | 3         9        268  | 26        1         248 |
| 4|8|      3         9   | 7         1        268  | 5         246       248 |
| 1      a |2|8       6   | 4         5        28   | 3         9         7   |
+-------------------------+-------------------------+-------------------------+
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