I have a sudoku puzzle that I have been doing for 270 hours. I never guess numbers and always thought that every move in sudoku had to have a logical explanation. Until the app generated this random puzzle:
I've never used any kind of help from an internet, but now it seems the time has come. I watched some videos, looked into some guides (i.e. sudokusnake.com). And they only helped me to eliminate 9 as a candidate in I5, G8 using the empty rectangle technique. The current state of my sudoku is:
What can be done to solve this sudoku puzzle, other than guessing? Any tips/hints?