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# Tough Sudoku for 16/February/2012

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Submitted by: sudoku lover

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 What a cutie! Is that straw in her hair? 16/Feb/12 12:09 AM Indeed! 16/Feb/12 12:44 AM Looks like she was eating something tasty. 16/Feb/12 12:58 AM Watermelon?? 16/Feb/12 9:11 AM Cheeky and cute! 16/Feb/12 10:14 AM As far as I could get:1. Note a18/c7=67;d14=57.Unique possibilities to 28.2. Whether g4=9=e6,a4=1;OR g5=9,a5=3;e7=1(to avoid the 19 unresolvable rectangle at ae46).UP32.3. Whether b7=3,b8=9=h9;OR b7=8,h7=6,c7=7=a1,d1=5,h1=4;gi9=14. 16/Feb/12 11:59 AM Hi Alfred,From UP28. if g4 were 9 then a6 would be 9 then neither e4 or e6 could be 9, so g4 must be4 making your gi9=14 not work, or have I screwed up somewhere? 16/Feb/12 1:30 PM A bit slow today, but I got there in the end. Good night all. 16/Feb/12 10:44 PM Hi David. After g4=9,e6=9 and a5=9 (not a6=9). Also, g4 can be 4 with gi9=14. The result being g9=1 and i9=4.This is actually the solution, but the problem is to prove it. 16/Feb/12 11:10 PM SE=7.2, long path:1)AUR(38)be78: (1)e7=(9)b8-b1=(9-6)c1=(6-7)c7=(7)g7,=>g7<>12)(7)g7=c7-a8=(7-6)a1=(6-9)c1=c9-h9=(9-6)h8=h 7-(6=7)c7,=>g1<>7,c1h8=693)XWZ:(28=6)i65-(6=2)f5,=>g5<>24)(4=5)h1-(5=7)d1-a1=( 7-6)a8=(6-9)h8=(9)h9,=>h9<>45)YW:(8=7)g3-(7=3)g7-(3=8)b7,=>b3<>8.UP=81 16/Feb/12 11:47 PM Step 1 is not necesary:1)XWZ:(28=6)i65-(6=2)f5,=>g5<>22)(4=5)h1-(5=7)d1-a1=( 7-6)a8=(6-9)h8=(9)h9,=>h9<>43)(7)g7=c7-a8=(7-6)a1=(6-9)c1=c9-h9=(9-6)h8=h 7-(6=7)c7,=>g1<>7,c1h8=694)(8=7)g3-g7=(7-6)b7=(6-8)h7=(8)b7,=>b3<>8.UP=81 17/Feb/12 2:08 AM Sorry, step 4 should be: 1)XWZ:(28=6)i65-(6=2)f5,=>g5<>22)(4=5)h1-(5=7)d1-a1=( 7-6)a8=(6-9)h8=(9)h9,=>h9<>43)(7)g7=c7-a8=(7-6)a1=(6-9)c1=c9-h9=(9-6)h8=h 7-(6=7)c7,=>g1<>7,c1h8=694)(8=7)g3-g7=(7-6)b7=(6-8)h7=h9-a9=(8)a2,=>b3i2<>8.UP=8 1 17/Feb/12 2:33 AM site puzzle:1. ur(19)ae46::(1)i46=*(9)a5-(9=268)fgi5-(8=2)i6-(2=1)f6 # -2g5, +1f462. (9=348)b378-(4)f3=(4-7)f2=SS(7)a81.ci2-(7=3)i8 # -3b8. 21/Feb/12 7:38 AM