I follow the discussion with the placement of 7 in Box 6 Colum 7, leading on to the pairing of 6,9 in Row 6.

Ahead of this play, however, I cannot see how to justify the 1 setting at R7C5.

Thus far my colums 5 reads:

R1C5 1/5/6/9

R2C5 7

R3C5 4

R4C5 5/6/9

R5C5 3

R6C5 2/5/6/9

R7C5 1/2

R8C5 8

R9C5 6/9

With 1 at R7C5 there follows 2 at R6C5 and hence the elimination of 2 at R6C6, leading to the 6,9 pairing in Row 6.

How to get there!

Help!