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Submitted by: uno hu

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just for the record, this is only the second time I've ever been able to complete the Tough puzzle. Please don't burst my bubble by saying it was a particularly easy one...
28/Jan/17 1:02 AM
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28/Jan/17 1:31 AM
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1. Unique possibilities to 28.Note b6c5=78.
2. Whether b6=8;OR d6=8,d1=5=a2;b2=2.UP30.
3. Whether g6=7,g5=1=e4;OR b6=7,d6=8,i6=5=h7,f7=7;e8=8.UP37.
4. Whether b1=4;OR b3=4,b6=7;g6=4.UP81.
28/Jan/17 1:56 AM
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Same as Alfred's
Standard techniques up 28
1. (5)a2=e2-e4=(5-8)d6=b6-(8=2)b2 =>-2a2 up 30
2. (8=1)e8-e4=d5-(17=8)cg5-b6=(8*-5)d6=i6-i7=(5-7)h7=(7)f7 =>-8df7 up 37
3. (4)b3=hi3-g1=(4-7)g6=(7)b6 =>-7b3 up 81

@Chayote: for this puzzle SE rating is 7.2 (SE acronym of Sudoku More...
28/Jan/17 4:40 AM
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UP28; 7c5 -> 0 solution; UP81

or, for example :

UP28; L2-Wing[4b3=4b1-4g1=(4-7)g6=7b6]-7b3
Kraken Cell (2678)f7 -> [1g7==1d5==7g5]-1g5; UP81
||7f7-7f3=7c3-7b1=7b6-7g6= 7g5
28/Jan/17 5:42 AM
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#29 1?@e4=>{d6=5=>b6=8=>c5=7=>g6=7=>g1=4=>b3=4=>f3=7,e8=8=>h2=8=>i7=8=>h7= 5=>f7=7}=>e4<>1
VHBC to #81
V:Only cell left in Vertical column for this candidate
H:Only cell left in Horizontal row for this More...
28/Jan/17 8:15 AM
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Instead of the Kraken Cell, one can simpler prove the exclusion of 1g5 with the following AIC :

[1d5=1d79-(1=8)e8-8df7=HP(58-7)hi7=7f7-7f3=7c3-7b1=7b6-7g6=7g5]-1g5; UP81
28/Jan/17 10:14 AM
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OK, Chayote, I won't say it, but...
28/Jan/17 4:11 PM
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