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June 22 Very hard

 
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SL



Joined: 22 Jun 2006
Posts: 1
PostPosted: Thu Jun 22, 2006 4:20 am    Post subject: June 22 Very hard Reply with quote
6 5 8 3 4 7 1 2 9
7 2 4 6 9 1 3 8 5
3 9 1 2 5 8 4 7 6

5 8 3 1 7 6 9 4 2
9 7 2 5 3 4 8 6 1
1 4 6 8 2 9 5 3 7

8 3 9 7 6 5 2 1 4
2 6 5 4 1 3 7 9 8
4 1 7 9 8 2 6 5 3

Is it an error for not UR( 4,8 ) at R3C6,7 and R5C6,7?
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Angel



Joined: 26 Mar 2006
Posts: 31
PostPosted: Thu Jun 22, 2006 9:41 am    Post subject: Reply with quote
You cannot swap the 4 and 8 otherwise you would have 2 4s in each of box 2 and 6, and 2 8s in each of box 3 and 5.

It is not a UR as each of your cells is in a different box. I'm no expert on URs (and the different types), but the key point is that rows, columns and boxes must be shared.
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