Solution to Sudoku no 559

Sudoku no 559 (Easy)

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Solution to Example from Sudoku no 558

Hodoku explains it as follows, with reference to the picture below.

Row 2 can have its 7 in 2 different squares, both marked in green.

Row 9 can also have its 7 in 2 different squares, both marked in green.

The 7s could be in:

R2C5 and  R9C6

or

R2C5 and R9C7

or 

R2C7 and R9C6

Whichever combination you choose, 7 must be removed as a candidate from R3C6.

It calls this a skyscraper:

Example from Sudoku no 558

I worked on sudoku no 558 until I got to the position below, where there is a hidden single value of 6 to be placed in row 9 column 5.

What is the next step after that?

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Solution to Sudoku no 558

Sudoku no 558 (Extreme)

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Solution to Sudoku no 557

 

Sudoku no 557 (Extreme)

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Solution to Sudoku no 556

Sudoku no 556 (Moderate)

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