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# Tough Sudoku for 26/March/2020

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Submitted by: Gath

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 Basics to 31 1.X-chain x=3 =>d4<>3 x=6 =>[h7,i7]<>6 2.W-wing 59 [a8,b4] =>[a56,b79]<>5 =>a8=5 basics to 35 3. if a9=3 =>UR 56 gh39 OR box3<>2=>a9=6 solve a2=6 gi2=28 gh3=56 26/Mar/20 2:50 AM This sure looks like a lovely place! 26/Mar/20 5:21 AM Basics to 281. X-wing (4)bd29 =>-4b37.d7; basics to 312. (9)a2=(9-4)b2=b9-(4=9)c8 =>-9a8; basics to 353. (4)f3=c3-(4=92)ce8-(2=856)e13.f1 =>-6f3; basics to 384. (4)i7=i8-(4=93)c48-(3=85)ai5 =>-5i7; basics to 395. (5=6)h9-a9=a2-(6=49)c38-b7=(9)g7 =>-5g7 6. More... 26/Mar/20 10:06 AM Basics to 281. (9=4)c8 - @(4)b9 = d9 - d2 = (4@-9)b2 = (9)a2 => -9a8 and @ loop eliminations: -4b37|d7 ; UP=352. (2=49)ic8 - (9=2)b7 => -2gi73. (8=2)e3 - e8 = (2-4)i8 = i7 - f7 = (46)f31 - (6=8)c1 => -8e1 ; UP = 384. (4)i7 = i8 - c8 = (46*)c37 - (6=3)a9 - (3=85)ai5 => -5i7, -6*i7 ; UP = 395. (2=48)i87 - (8)h7 = h3 - (8=2)e3 => -2e8 ; UP = 81 26/Mar/20 10:36 AM @Cenoman,Note you could have finished with this step 6:6. (4)d9 = b9 - (4=93)c48 - a5 = (3*)a9 - (3=92^)e98 - (2=8)e3 - h3 = (8-5)h7 = (5)gh9 => -53*2^d9 26/Mar/20 3:21 PM @rwmYes, and I could have started with a step 1 combining my steps 1 & 2 (as does your step 1)Thanks for spotting the possible combo AIC finishing the puzzle.You may have noticed that I often miss such combos. I suspect there must be somes (while seeing common nodes or subchains) but I More... 26/Mar/20 10:04 PM 27:05 26/Mar/20 10:58 PM SE=7.2Basics to UP=281)XW(4)bd29,=>b47d7<>32)(5=9)a8-a2=b2-(9=5)b5,=>a5<>53)(5=6)h9-(6=3)a9- (3=8)a5-(8=5)i5,=>i7<>54)(2=9)b7-(9=4)c8-(4=2)i8,=>gi7<>25)(6):h97=h3-ig2=a2-a 9=i7,=>gi7<>66)(8)h7=h3-(8=2)e3-e8=(2-4)i8=(4)i7,=>i7<>8.UP=81 27/Mar/20 3:52 AM