Gif version of   https://youtu.be/MOhaIsAFeqQ
Double Pointing Triple Subset
- Solution for Row 7 Column 9 starts with a hidden pair 
  in block 1.
- The hidden pair defines double pointing locked 
  candidates in column 3 of block 1.
- The double pointing locked candidates defines one square
  of a pointing triple subset in row 8. 
- The triple subset in row 8 defines one end of a pair in 
  column 2.
- The pair in column 2 defines one square of a triple subset 
  in row 7. 
- The double pointing locked candidates in column 3 block 1
  defines a second square of the triple subset in row 7.
- The triple subset in row 7 defines a solution square in
  row 7 column 9.
- Nice one!

Self_Solving_Sudoku_NYT_Hard_02_Nov_2017_Animated_gif_Triple_Subset

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Gif version of https://youtu.be/MOhaIsAFeqQ
Double Pointing Triple Subset
- Solution for Row 7 Column 9 starts with a hidden pair
in block 1.
- The hidden pair defines double pointing locked
candidates in column 3 of block 1.
- The double pointing locked candidates defines one square
of a pointing triple subset in row 8.
- The triple subset in row 8 defines one end of a pair in
column 2.
- The pair in column 2 defines one square of a triple subset
in row 7.
- The double pointing locked candidates in column 3 block 1
defines a second square of the triple subset in row 7.
- The triple subset in row 7 defines a solution square in
row 7 column 9.
- Nice one!

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