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Tough Sudoku for 11/October/2019

                 
                 
                 
                 
                 
                 
                 
                 
                 

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Submitted by: sudoku lover

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11:41.
11/Oct/19 1:02 AM
Bus on a river! Fun ride!
11/Oct/19 5:54 AM
(S.E. 8.5) Basics to 25
1. (1)b1=b6-(1=8)a6-e6=(8-3)e4=(3)e1 =>-3b1
2. (3)a4=e4-e1=c1 =>-3a2; basics to 26
3. (1=8)a6-a8=(8-6)b8=(6)b6 =>-1b6; basics to 28
4. (9)a3=(9-8)c3=c56-a45=(89)a38 =>-25a3
5. (5)g1=(54-1)g45=g79-(1=694)cdh9-(4=125)e369 =>-5e1
6. More...
11/Oct/19 7:31 AM
1. (3): a45 = a2 - d2 = d5 => -3bc5
2. (9)a3 = (9-8)a8 = b8 - (8=52)be3 => -25a3
3. (9)f5 = (9-2)f8 = e9 - (2*)e3 = c3 - c5 = (23)ad5 - (3)d2 = (3*)e1 - (3=481)e35.f1 => -14f5, -2*e1; UP=29
4. (1)b1 = a2 - (1-8)a6 - a8 = b8 - (8=54)*b35 - (4=3)d5 - d2 = (3)c2 => -3b1, -(45)*b1 More...
11/Oct/19 2:42 PM
Corrections:
Omitted count after initial basics -- basics to 25

In step 3, 'e35.f1' should be 'e46.f4':
3. (9)f5 = (9-2)f8 = e9 - (2*)e3 = c3 - c5 = (23)ad5 - (3)d2 = (3*)e1 - (3=481)e46.f4 => -14f5, -2*e1; UP=29
11/Oct/19 3:08 PM
Basics to 25
1.X-chain x=3 =>[a2,b5,c5]<>3
if d5=3 => d6=7 f5=9 f4==1
if e4=3 =>d2=c1=3 e6=8 a6=b1=1 c2=4 b3=b5=58
b8=6 b6=4 a3=9 c7=b3=e1=5 f1=4 f4=1 f5=9 d6=7
=> basics to 49
2. XY-chain 1256 [d2,e9,e3,h2]=>h9<>1] =>h2=1
solve
12/Oct/19 4:12 AM
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