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Tough Sudoku for 14/October/2016

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

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Submitted by: Gath

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SE=7.2
SSTS
1)(6)a4=(g4)-(62=5)g13-(5=9)g9-(9=7)d9-(7=1)a9-(1=8)a5-(8=3)a3,=>a4<>3.UP=81
14/Oct/16 1:03 AM
1. Unique possibilities to 37.
2. Whether a9=1,a2=9,a5=8;OR c9=1,g9=5,g13=26,a4=6;a3=3.UP81.
14/Oct/16 1:42 AM
Standard techniques up 41
1. (78)g46=(8)g5-(8=1)a5-a9=(1-5)c9=(5-9)g9=(789)g456 =>-26g46 up81
or, with ALS chain: 1. (625=9)g139-(9=71)ad9-(1=8)a5-(8=2596)g1359 =>-6g46.i13 UP 81
14/Oct/16 3:41 AM
Hi Alfred,
after 37 solved cells, you have:
-locked (1)@de4 =>-1abc4
-locked (3)@hi5 =>-3ac5
then -1c4 => locked (1)@b123 =>-1a23, so that a2=9=b7, c7=3, i7=7 (41 solved cells)
Best regards, cenoman
14/Oct/16 3:55 AM
#29 79@d89=>e79<>9 #38 1@de4=>b4<>1 1@b123=>a2<>1
#42 3@hi5=>a5<>38?@a3=>a4=3=>g4=6=>g1=2=>g3=5=>g9=9=>d9=7=>a9=1=>a5={}= >a3<>8
VHBC to #81
V:Only cell left in Vertical column for this More...
14/Oct/16 6:03 AM
#29 79@d89=>e79<>9 #38 1@de4=>b4<>1 1@b123=>a2<>1
#42 3@hi5=>a5<>3 8?@a3=>a4=3=>g4=6=>g1=2=>g3=5=>g9=9=>d9=7=>a9=1=>a5={}=>a3<>8
VHBC to #81
V:Only cell left in Vertical column for this More...
14/Oct/16 6:04 AM
Thanks cenoman.But you mean 'then -1b4....', don't you?
Best regards, Alfred.
14/Oct/16 8:17 AM
Right, Alfred. Sorry for the typo...
14/Oct/16 9:13 AM
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