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Tough Sudoku for 22/March/2018

                 
                 
                 
                 
                 
                 
                 
                 
                 

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Sudoku Solving Techniques

Submitted by: sudoku lover

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(S.E. = 7.2) Basics to 28
1. (735=8)a46.b4-a2=b2*-b5=h5-(8=7)i6 =>-7b2*,-7gi4; basics to 38
2. Loop (4)b5=b9-(4=269)egh9-(9=78)hi8-(7)e8=e4-b4=(7)b5@ =>-58b5,-7d8; basics to 44
3. (5=7)d5-d7=g7-g3=(7-5)h3=(5)h6 =>-5d6; singles to 81
22/Mar/18 1:25 AM
What gorgeous orange flowers The tree in the background sets them up perfectly.
22/Mar/18 4:30 AM
23:01
22/Mar/18 4:42 AM
1. To avoid deadly pattern (19)(95)(51)abc1|abc7, either b1 or c1 must be 3 => -3d1 ; UP = 29
2. (7=8)i6 - h5 = b5 - (8*)b2 = a2 - (8=57)a6.b4 => -7*b2 , -7gi4 ; UP = 39
3. To avoid UR (45)de1|de8 ; either (3)d8 or (7)de8 must be true, so
(3)d8 = (7)de8 - (7=264)df7.e9 - (4=3)b9 => -3c8 ; UP = 81
22/Mar/18 7:54 AM
Ignoring Basics
#29 7?@c5=>c8=4=>b9=3=>b4=5=>b7=9=>b1={}=>c5<>7
#32 7?@b5=>{d5=5,35@ab4=>a6=8=>i8=8,b9=4=>f9=3}=>h6=5=>e6=7=>f8=9=>h8=7=>h3={ }=>b5<>7
Ignoring Sudoku fundamentals.
#29 More...
22/Mar/18 9:58 AM
Basics to 28
1.WXYZ-wing 3578 a4a6b4i6 => g4<>7 i4<> 7
=> i4=1 Basics to 31
2. if b2=7 => b5=8 c5=4 c5=7 =>b2<>7 =>c=7
Basics to 41
3.WXYZ-wing 2567 c5c7f7f4 => e9<>2 f9<> 2
=>g9=2 Basics to 45
4.XY-Chain 2567 d567f7 =>f4<>6 =>e9=4 solve


22/Mar/18 9:08 PM
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