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Tough Sudoku for 10/July/2012

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

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Submitted by: Gath

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11,12
10/Jul/12 2:52 AM
#1. LC and LS up to UP31
#2. Chain[ 3] : SSF : 5d8=5d1-5c1=5c4-5i4=5i9 :=> -5e9.5h8; UP31
#3. Chain[11] : 5d8=7d1=5e3 :=> -5d1; UP81 [via NP(14)e79]

5d8=6d8
____6f9=6a9
________8a9=8b9
____________8b5=8a5
7d1=================7c1
_ More...
10/Jul/12 3:31 AM
1. Note h8/i9=58,bg8=79.Unique possibilities to 29.
2. Whether d8=5;OR d1=5=c4=h6;i9=5.UP31.
3. Whether h4=6;OR h2=6=d8,d1=5;c4=5.UP33.
4. If g8=9=h5,i7=1,h7=3=g1,b8=7,g5=4(g3=4 results in c259=34),g6=1,a6=2;29 have no place in box B8.So g8=7.UP40.
5. Whether i3=6,e3=9;OR f3=6=d8,d1=5;a3=5.UP81.
10/Jul/12 9:24 AM
SE=7.2
SSTS to UP=29
1)(5)h6=a6-c4=c1-d1=(5-6)d8=d2-h2=(6)h4,=>h84<>5
2)XW(9)bg68,=>b5g135<>9
3)(5)a3=a1-d1=(5-6)d8=d2-f3=(6-9)i3=(9)e3,=>e3<>5
4)(4):h4=b4-b3=g3,=>h2<>4
5)(1 9=3)hi7-g9=g1-(3=12)a1b3-(2)c12=(2)c7,=>c7<>9.UP=81
10/Jul/12 7:39 PM
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