# Next move for Sudoku puzzle and why [closed]

I am currently stuck at this point in the below Sudoku puzzle. I have tried to apply various tricks such as XY wing, swordfish etc. but the preconditions are not fulfilled for any number.

What is my next move and why?

Thanks!

If r4c4 is a $$1$$, then r2c4 is a $$5$$. Also r4c8 is $$9$$, therefore r3c8 is a $$5$$. But this cancels both $$5$$'s in the top-left block. So r4c4 is a $$4$$.