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# Tough Sudoku for 14/September/2018

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Submitted by: Gath

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 Basics to 461. UR(47)af46 using internals:(2)a4==(3)f6-(3=6)f1-a1=(6-3)a2=(3)a7 =>-2a7; singles to 81 14/Sep/18 12:16 AM Got interrupted and forgot to restart timer, but it felt much faster than normal... 14/Sep/18 12:56 AM Canada? 14/Sep/18 12:57 AM Basics to 46 1. X-chain x=3 => c5<>3 => c5=7 b5=3 h5=7 solve 14/Sep/18 1:02 AM Regina? 14/Sep/18 5:00 AM Lovely river, with waterfalls, under a beautiful pink sky. 14/Sep/18 5:19 AM #47 2?@c8=>a7=3=>b5=3=>c5=5=>c4={}=>c8<>2 14/Sep/18 6:01 AM 1. Unique possibilities to 46.2. Whether a7=2,c68=18;OR a7=3,a2=6;a1=8.UP81. 14/Sep/18 6:31 AM Quicker is:2. Whether bi9=7;h5=7.UP81. 14/Sep/18 6:35 AM Canada's 4th largest river. 14/Sep/18 9:55 AM cenoman:I believe your last strong link, (3)a2 = (3)a7 is incorrect since (3)a1 is still present. Your idea is usable, though, say:1. (2)a4 == (3)f6 - (3=6)f1 - d3 = (6-2)h3 = (2)h7 => -2a7 14/Sep/18 11:53 AM all. A gorgeous photo of one of Canada's famous rivers. ðŸ‡¨ðŸ‡¦ ðŸ‡¨ðŸ‡¦ 14/Sep/18 1:05 PM Hi rwm, you are right. Thanks for spotting...I ignored 3a1 because it is eliminated by the X-wing (3)ag27. I should have written (2)a4==(3)f6-(3=6)f1-a1=(6-3)a2=g2-g7=(3)a7 =>-2a7... but your path is shorter. 14/Sep/18 7:34 PM Basics to 46 1.correct X-chain x=3 => a1<>3 2.X-chain x=7 => b5h8i6i4<>7 => h5=7 b5=3 c5=5 solve 14/Sep/18 8:21 PM