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PostPosted: Mon Jun 25, 2012 3:06 pm 
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Grand Master
Grand Master
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Joined: Thu Apr 24, 2008 4:27 pm
Posts: 791
I hadn't planned to try any more of these without pencil marks, but this one was already printed out and handy, and it looked pretty straight-forward, so I gave it a shot. Evidently I messed up something, because after making a good deal of progress, I came to a point where I was sure it had more than one solution. I ran it through both SudokuSolver and JSudoku, both of which assured me it had a unique solution. I tried again with pencil marks, and solved it in fairly short order.

On Børge's scale, I would rate this one at Apprentice level, Tough.

Image

Code:
.7..5..4.6.93.45.2.4..7..9..5..2..1.4.28.13.7.9..3..2..3..6....5.79.3....1..4....
.4..2..9.1.74.32.8.3..1..4..7..5..2.4.12.98.5.8..3..6.....9..8....5.16.4....4..1.
....3.......8.5.......1.....9..2..7.4.79.12.3.1..6..4.....5.......1.8.......9....
.2..7....7.58.9....9..3.....3..6..5.9.43.87.2.1..4..6..5..2..8.6.35.12.4.8..9..3.
....7..4....8.42.6....1..7..1..9..5.7.45.39.1.5..6..2..2..4..3.3.92.71.8.7..8..9.


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