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# Tough Sudoku for 13/March/2018

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Submitted by: Gath

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 Basics to 391a. (1)f4=(13-7*)e46=a6-(7=3)b5-b3=(3-6)c3=(6^-5)f3=(5)e3 =>-5e6*, -1f3^1b. (1)f4=(13-7)e46=a6-(7=3)b5-b3=(3-6)c3=(6-8)c2=f2 =>-1f2; basics to 412. (7)a6=(7-3)b5=i5-(3=5)i8-g789=(5)g6 =>-5a6; basics to 463. (7)b5=(7-5)f5=(5-6)f3=(6-3)c3=(3)b3 =>-3b5; singles to 81 13/Mar/18 1:10 AM Basics to UP = 391. (5=3)g6 - i5 = (37*)b5|a6 - (3=215)bge3 => -5*a6, -5e6 ; UP = 40 2. (2)f1 = (2-7)b1 = b5 - (7=52)df5 => -2f4 ; UP = 463. (7=3)b5 - b3 = HP(36-5)cf3 = (5)f5 => -7f5 ; UP = 81 13/Mar/18 3:36 AM Wilodene, for a wonderful Snowy Owl photo. 13/Mar/18 4:49 AM Ignoring Basics#40 2?@f1=>b3=2=>{c3=3=>f3=6=>e3=5,b5=3=>a4=5=>f4=1}=>5@df5=>i5=2=>d5=5=> ;f8=5=>i8=3=>i4={}=>f1<>2 13/Mar/18 8:05 AM d5=5=> ;f8=5d5=5=>f8=5 13/Mar/18 8:07 AM What an attractive bird. 13/Mar/18 8:59 AM 1. Unique possibilities to 39.2. Whether g6=3=e4;OR g6=5;a4=5.UP40.3. Whether b1=7,f1=2;OR b5=7,df5=25;f4=1.UP41.4. Whether e3=5=g6=i8=f5;OR f3=5,egb3=123;b5=7.UP81. 13/Mar/18 11:46 AM The result of step 3 should read UP42. 13/Mar/18 11:48 AM Basics to 39 1.X-Chain x=7 a8<>7 e9<>7 e7<>7 2.W-wing 35 a6<>5 i4<>5 =>a4=5 Basics to 40 3.c1 <> 8 => c1=7 OR c2=8 solve 13/Mar/18 9:44 PM Basics to 39[(2)r1c29 (2)r158c6 (2)r238c2]-2r1c6; ste 14/Mar/18 4:57 AM