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16 x 16 broken?

Submitted by: barclay

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 1. Note a6b5=16.Unique possibilities to 31.2. Whether c6=3;OR c5=3,c8=4(or else 27 Unresolvable Rectangle @ bc48);i6=4.UP33.3. Whether i3=1,ah3=59;OR i3=5,i4=9,g6=8,i12=16,g2=7;OR i3=9,a37=56,d7=7;e3=7.UP38.4. Whether i4=9=a3;OR i13=9;h3=2.UP81. 04/Feb/17 2:43 AM |  |
 Standard techniques up 311. (6)i7=i12-(6=587)cgh2=(7)d7 =>-6d7 up332. (3)i7=(3-4)i6=c6-a4=[9a4-9c46]=(9-8)c1=(8-2)g1=h3-h7=(2)e7 =>-3e7 up 343. (5=3)h7-i7=(3-4)i6=c6-(4=9)a4-(9=5)a3 =>-5a7, -5h3 4. (2)h3=(28-9)cg1=(9)i1 =>-9h3 up 495. (3=49)a48-(9)a3=(9-8)c1=g1-g6=(8-9)h6=(9)h8 =>-3h8 up 81 04/Feb/17 3:24 AM |  |
 Hi Alfred, very neat and nice UR. But for me it leads to 40 solved cells (details below)Standard techniques up 311. UR(27)bc48 =>4c48==9c4 (using internals)//(4)c48=(9)c4-(9=4)a4 =>-4c6 up 402. XW (9)a3=a4-i4=i13 =>-9h3; stte lcls techniques following More... 04/Feb/17 4:30 AM |  |
 Very unusual plant, Kate. 04/Feb/17 6:00 AM |  |
 As Alfred's:SSTS1)AUR(27)bc48:(4)c8=(7*-3)c5=(3)c6,=>c8<>7,c6<>42)(2=9)h3-(9=6)i1- (6=2)f1,=>f3<>2.UP=81 04/Feb/17 7:35 AM |  |
 #27 134@b123=>b5<>1#32 7?@h3=>g1=2=>c1=8=>{i1=9,a3=9=>i3=5=>i4=4}=>a4={}=>h3<>7 3@c56=>c8<>3#34 1@i123=>h3<>1 1?@i3=>b3=4=>f3=2=>g1=2=>c1=8=>{i1=9,c2=5=>i2=6=>a7=6=>a9=5,a3=9=>a4=4=&G More... 04/Feb/17 7:38 AM |  |
 Hi cenoman. Thanks for the explanation, which makes my step 3 unecessary.I missed the 578 triple in row 2.Best regards, Alfred. 04/Feb/17 7:50 AM |  |
 14:41 With a very long break (paused it) between start and finish. Rang my sister-in-law. 04/Feb/17 2:09 PM |  |
 Yay, Tough is back. 04/Feb/17 5:02 PM |  |
 18:34 05/Feb/17 9:27 AM |  |

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