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Tough Sudoku for 12/July/2019

                 
                 
                 
                 
                 
                 
                 
                 
                 

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Sudoku Solving Techniques

Submitted by: sudoku lover

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Basics to 28
1.X-chain x=7 =>[a7,b3,d147,e7,f18}<>7 =>b3=3
f4=7 basics to 35
2. X-chain 1569 [b2,b4,d4,h4] =>h2<>5 => b2=5
basics to 54
3.W-wing 26 [a5,b9] =>[b6,a7]<>2 =>b6=9 a7=6
solve
12/Jul/19 1:30 AM
18:33.
12/Jul/19 2:29 AM
The view would be nicer without all those buildings
12/Jul/19 4:30 AM
We've seen this photo before, but I still do not know who lives in Monaco!
12/Jul/19 6:41 AM
Oops, yes I do know who lives in Monaco! Karen from Monaco.
12/Jul/19 6:42 AM
I should have timed this puzzle. It was several hours! I went to a medical appointment, changed clothes before I went and after I came back, ate lunch, watered plants, watched a storm come in, made some phone calls, replied to several emails, read some news articles, .... and finally completed the puzzle.
12/Jul/19 6:45 AM
Basics to 28
1. (7): e3 = e7 - a7 = a1 => -7b3 ; UP = 45
2. (6=2)i5 - (2=5)i1 - (5=6)c1 - (6)b2 = kite(6): [b9=b4-a5=i5] => -6a9 ; UP = 81
12/Jul/19 11:56 AM
correction: the step 2 elimination is -6i9
12/Jul/19 11:57 AM
38:58
12/Jul/19 11:58 AM
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