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Tough Sudoku for 13/March/2019

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

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Check out the latest post in the Sudoku Forum

Sudoku Solving Techniques

Submitted by: sudoku lover

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Basics to UP = 26
1. (2)e3 = ab3 - (2=15)c12 - UR - (15=9*)d12 - (9=7)d3 => -9*7e3 ; UP = 81
13/Mar/19 12:20 AM
Same UR as rwm's
Basics to 26
1. UR(15)cd12 using internals
(9)d2==(2)c12-(236=9)abg3 =>-9de3, -9ghi2; basics to 81
13/Mar/19 2:17 AM
Basics to 26
1. if e7=4 OR e7=5 =>f4=g8=c7=1 c12=25 e3=g3=69
=> a3=b3=3 => e7=6 Basics to 33
2. UR34 hi27 => [h2,i2]<>4 if i2=3 => h2=9 g3=6
a3b3=23 UR 15 cd12 => i7=3 solve
13/Mar/19 4:40 AM
Hi rwm and Cenoman. After 26 @ e3,7 @ d3,9 @ g3 and 9 @ i4; I can't see the next UP?
Best regards, Alfred.
13/Mar/19 6:04 AM
Big cruise ship , little boat!
13/Mar/19 6:23 AM
Hi Alfred,
After the moves you mention you have:
- HPs (89)e28, (68)g12, (29)h89;
- Pointing (7)f89 =>-7f4, (3)hi7 =>-3c7;
- HP (37)c89;
- Box-line interaction (2)c12 =>-2a3.b123 =>+2e3 and singles to the end.

The efficient basic moves are HP(29)h89; pointing More...
13/Mar/19 8:53 AM

Singles to 26
If 59@gh4 1@g8 c7 14@b12 and 6@g3 64@b12 => 9@i4 up27
If 7@h4 4@h1 e7 d6 45@gh4 => 7@h1
If 1@g4 or 1@i56 (9@g3 2@e3 f4) => 1@d6 solve
13/Mar/19 10:33 AM
Basics to 26
1.if g3=6 => UR15 cd12 =>g3=9 d3=7 i4=9
Basics to 29
2. X-chain x=2 =>[f1,f2,e4,e5,b123]<>2
=>e3=2 f4=2 solve

13/Mar/19 5:25 PM
Thanks Cenoman. I missed the 29 pair, which in turn results in 37 @ c89 etc.

Best Regards, Alfred.
13/Mar/19 11:48 PM
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