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Tough Sudoku for 22/November/2014


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Sudoku Solving Techniques

Submitted by: sudoku lover

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The perfect mode for a river...
22/Nov/14 12:36 AM
1. Note c59=35;ghi1=678.Unique possibilities to 33.
2. Whether h1=7,h6=2;OR h1=8,i1=6,i6=2;d5=2.UP35.
3. Whether g9=4,d9=9,d1=1;OR g9=8,g5=6;e5=1.UP81.
22/Nov/14 12:44 AM
UP33; [XYWing(4-89)dg9.e8=6e8-(6=17)e5d4-7g4=(78)h61]-8h8; UP81
22/Nov/14 1:29 AM
SE=7.2 UP to 33
1)XY-Ring:(2=6)i6=(7=2)h6=(8=7)h1=(6=8)i1 =>idf6,g5<>2,i5<>26,g1<>8 UP=35
2)2-chain logic:(4=8)g9-d9=(4-6)d8=(6)d6 or (8)g9=(6)g5 => e5,i6<>6 UP=81
22/Nov/14 2:18 AM
Q-1: Symmetry=None, Start=25, SSTS=32, SG=16.25, SE=8.8
22/Nov/14 2:27 AM
Q-1 is perhaps too difficult for most players to find a chained path, but those using the easier
forcing net style (JC, Alfred) should be able to come up with something.
22/Nov/14 2:30 AM
#26 15@ac9=>c9<>3
#31 2@df1=>678@ghi1=>7@e23=>e7<>7&d1<>7
#34 8@e78=>e5<>8
1?@i5=>{e2=1&g5=8=>[d5=2&g9=4=>d9=9]}=>d1={}=>i5<&G T;1
#42 49@d89=>e78<>9
VHBC to More...
22/Nov/14 6:54 AM
#26 15@ac9=>c9<>3
#31 2@df1=>678@ghi1=>7@e23=>e7<>7&d1<>7
#34 8@e78=>e5<>8
i5< >1
#42 49@d89=>e78<>9
VHBC to More...
22/Nov/14 6:56 AM
Based on Les's logic:
2. Whether d56=6,e5=1;OR d8=6,dg9=48,i5=8;i4=1.UP81.
22/Nov/14 7:29 AM
A very long path:
1)(5): b4=h4-g6=g7,=>b7<>5
3)(1=19)c89b8a9-(5)b8a9=a 7-g6=(5=1)g6=(1)i5,=>c5<>1
5 More...
23/Nov/14 6:29 AM
23/Nov/14 10:27 AM
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