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SukakuExplainer
Modification to Sudoku Explainer (SE) by Nicolas Juillerat to accommodate Sukaku (Pencilmark) Sudoku puzzles
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If you always find out that the next step that you didn't spot is a WXYZ-Wing, that most likely means that you know all the techniques the computer solver uses for the difficulty level you currently use, except for WXYZ-Wings. I was at this exact point for quite some time (my subreddit flair references that struggle), and I took it as a challenge to get good at ALS-XZ-based techniques. The underlying reason was just the ordering of techniques used for SE rating (used in SudokuExchange.com for grading puzzles) though, not some truth inherent to Sudoku in general.
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