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Tough Sudoku for 12/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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Haven't seen any of Keyan's photos for quite some time.
12/Dec/18 12:04 AM
1. Note 19 @ e56,467 @ bcf3.Unique possibilities to 29.
2. Locked 4s @ ad15 (X-Wing);c1<>4.UP81.
12/Dec/18 1:07 AM
19:29.
12/Dec/18 1:21 AM
Basics to 29
1.X-chain x=4 =>[c5,c1,f5,f1]<>4
UR 19 eg56 => g5<>9 g5<>1 if g3=9 =>i5=1=a1
a2=3 a5=c3=f4=d1=4 f5=5 ab1=79 d56=68 =>d2=9
f2=8 f1=2 g1=8 e3=3 e7=2 a7=7 a6=6 d5=6 g5=0
=>g6=9 i5=1 solve
12/Dec/18 4:47 AM
c1<>4 alone, is not sufficient. needs more work.
12/Dec/18 5:03 AM
Basics to UP = 29
1. (3=2)e3 - f1 = HP(21)ga1 - (1=3*)a2 - (3=2674)a8765 - (4)d5 = (4)d1 => -3d1, -3*d2; UP = 33
2. (8=31)i42 - (1=8)g1 => -8f45
3. UR(19)eg56 => -19g5
4. (4)d5 = d1 - f3 = c3 - (4=6)c4 - g4 = (6)g5 => -6d5 ; UP = 81
12/Dec/18 5:03 AM
correction: step 2 eliminations are -8g45
12/Dec/18 5:07 AM
Wow! That's a beautiful sky in this photo.
12/Dec/18 6:44 AM
Hi rwm,
Very nice !
12/Dec/18 7:08 AM
#30 2?@g1=>i2=1=>a1=1=>d1=4=>68@d56=>f2=8=>f8=9=>f1….9<>2=>g1<>2
#34 3?a2=>a7=7=>a6=6=>38@c57=>c4=4=>a1=4=>abc123<>1=>a2<>3
NB /
#25 19@e56 467@bcf3 19@eg6 4@cf34
#30 9@bc1=>f1<>9
12/Dec/18 8:29 AM
1. Unique possibilities to 29. Note locked 4s @ ad15.
2. Whether h1=3=e3;OR h1=8;df2=89.
3. Whether f3=4=a1,a2=1,i2=3;OR f3=4,f1=2;e3=3.UP33.
4. Whether a6=7,a72=31;OR a6=6=h8=g4=d5;a5=4=f4,i8=5=h4=g3;g1=1 (or else 19UR @ eg56).UP81.
12/Dec/18 9:58 AM
Step 3 should read:

3. ...........OR f3=7, ..........
12/Dec/18 10:01 AM
13!!! Good morning all.
12/Dec/18 10:15 AM
Great colours
12/Dec/18 8:50 PM
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