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Tough Sudoku for 29/August/2009

                 
                 
                 
                 
                 
                 
                 
                 
                 

Choose a number, and place it in the grid above.

  1 2 3 4 5 6 7 8 9
Check out the latest post in the Sudoku Forum

Sudoku Solving Techniques

Submitted by: sudoku lover

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Have a wonderful weekend, everyone!
29/Aug/09 12:35 AM
30:21
29/Aug/09 12:41 AM
Alternative power seems to be very current today!
We often have wind turbines being hauled through our town... right down main street. Those things are rather impressive... even in pieces! When we were on holiday in Ontario last month we saw about 150 of them, but not on haulers. They were working 'windmills'.
29/Aug/09 12:57 AM
One very necessary guess today... I was totally stumped. Cool water wheel!
29/Aug/09 6:19 AM
27:59, despite almost falling asleep around the 15 minute mark!
29/Aug/09 4:42 PM
1. Unique possibilities to 27.
2. If f5=7=d3=b1=c6,f1=6=b3,f7=2=c8,b6=4=c9,c2=9,a9=5=b2,and 59 have no place in column f.Hence f5=5,f2=9, and UPs to 81.
29/Aug/09 6:27 PM
Not as short as Alfred's one step solution:
1) start 22 UP 27
2a) (NQ1259)abcf2 => a1<>1, b3<>2, deg2<>159
2b) (NP75)f25 = (5)abc2 - (5=6)a1 - f1 = (HP26)f78 => f78<>57 UP 28
3ab) (LC18)abc7 => abc9c8<>18
3c) (NP56)a19 => a247<>56 UP 32
4) (kite6)d3=b3-a1=a9 => d9<>6 UP 81
29/Aug/09 6:36 PM
33:02
04/Sep/09 7:20 AM

SE=8.3
09/Sep/10 11:23 PM
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