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Tough Sudoku for 31/December/2018

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

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Sudoku Solving Techniques

Submitted by: sudoku lover

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''Tough'' to get started, but then the puzzle unraveled like a poorly-knit sweater!
31/Dec/18 12:56 AM
42:28
31/Dec/18 1:52 AM
With Christmas behind us and the year drawing to a close, Here’s hoping that the year ahead is healthy happy and hopeful. For everyone
31/Dec/18 1:54 AM
Basics to 26
1.if e7=9 => e6=8 f6=1 f4=5 b4=7 f5=4 f1=3=d5
f5=9 d1=1 d9=4 d8=8 b7=8 a7=7 a8=6 b6=9 c6=9
a6=6=a8
=> e5=9 solve
31/Dec/18 2:56 AM
Basics to UP = 26
1. (7)a7 = b7 - (7=5)b4 - (5=18)e4.f6 - (8)e6 = (8)e7 => -8a7
2. (9)b3 = (9-8)d3 = d8 - ef7 = (8*)b7 - a8 = HP(18-3)a23 = (3)c2 => -8*b3, -9c2 ; UP = 33
3. (2=76)a57 - (6)a3 = c1 - (6=47)g12 - (7)g9 = HP(72)hc9 => -2c5 ; UP = 81
31/Dec/18 3:53 AM
WE #641,SE=8.4
2..5......83.64....1..2....3..916.....6..7214...4.2..3.......3....17.84....6.5..7
31/Dec/18 4:04 AM
Basics to 26
1. (8)e7=(8-4)e6=h6-(4=7)i5-a5=(7)a7*-(72=5)ac5-f5=(56)f79 =>-8a7*, -8f7
2. Almost finned X-wing [FXW(8)b3*=d3-d8=ab8] = (8)a3-(89=6)bd3-b6=a6-(627=8)a578 =>-8b7; basics to 44
3. (56=7)af7-(72=5)ac5 =>-5f5.c7; singles to 81
31/Dec/18 8:43 AM
WE #641, SE=8.4
Basics to UP=32
1)(9=1)g1=g8=(1-2)i8=h8-(2=9)h1,=>i8=12,g3<>19,i12<>9
2)(4)a13=a7-g7=(4-3)g9= (3-9)e9=(9-4)e3=(4)e1,=>bc1<>4
3)(2=3)b1-e1=(3-9)g2=(9)c2,=>c2<>2
4)(1)i3=(1-9)g 1=(9-6)g4=(6)g3,=>a3<>6
5) Kraken More...
01/Jan/19 3:37 AM
Typo,4)=>i3<>6
01/Jan/19 6:13 AM
Basics to 32
1. (5)g8=(5-6)g3=g4-(6=9)h4-(92=5)h18 =>-5a8; basics to 34
2. (3)b1=e1-e9=g9-(3=4)g7-a7=(4)a13 =>-4b1
3. (2)i2=(2-1)i8=g8-(1=9)g1*-(92=5)h18-h6=(5)i6 =>-9i2*, -5i2
4. Kraken row (3)dfg7 =>-6i2; basics to 46
||(3)d7-d5=(3-5)e5=a5-(5=6)a2 More...
03/Jan/19 9:30 AM
Omitted: the above is a path to WE#641
03/Jan/19 9:31 AM
SE 8.4
basics to 32

1. cycle (9)h4=g5-(9=1)g1-i3=(1-2)i8=h8-(2=9)h1-h4 -> -1g3,-5i8,-9abce1g38h7i238, singles to 34.
2. (5)g3=g8-(g=2)h8-h1=i2 -> -5i2
3. dynamic (8=5)a5-(5=7')b4-(7=46)b49-(4=2)b6-(24=3)b1-(236=5)b2-(5=6)a2-(67'=4)b3-a13=(34)ag7-(3=8)d7 -> -8d5; singles to More...
05/Jan/19 9:08 AM
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