In my Sudoku videos I solve very difficult Sudoku puzzles step by step. Especially difficult parts are explained in detail.
The Pdf to the video: http://sudoku.bplaced.net
All my videos: https://www.youtube.com/c/HowtosolvedifficultSudoku/videos
Take a look at my sudoku channel: https://www.youtube.com/channel/UCPbqcrcoZIiTKtRL1cJ8iYQ
This are my Sudoku techniques I use: https://www.youtube.com/watch?v=6fESLpaTGPs