Solving Sudoku puzzles made easy (part 10)

All we have left to complete are the top rows in the top-right box and the middle-right box. As we have pre-entered possibles in these cells, the rest is on automatic.

Let's start with the 9 we already have in the bottom-right box.
The cell in row one, column eight is marked "6,9", it can no longer be 9 so make it 6.
The cell to the left of that 6 was marked "6,7" so make it 7 and finish off the top-right box with a 9.

The middle cell in the top row of the middle-right box is marked "1,6", it can no longer be a 6 so mark it 1.
The cell to the left of it is marked "1,6,7". It can no longer be a 1 (look at the 1 in row eight) or a 7 (look at the 7 in row one) so make it a 6.
Finish off with a 7 in the top-right cell of the middle-right box.
Job done.
Full series here.