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SukakuExplainer
Modification to Sudoku Explainer (SE) by Nicolas Juillerat to accommodate Sukaku (Pencilmark) Sudoku puzzles
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
The SE rating system is based on a list of Sudoku techniques that have been ranked (somewhat subjectively) by how difficult they are to spot and apply. A computer solver uses that list and repeatedly applies the easiest available move from the list to the puzzle until it is solved. The difficulty of the hardest individual step un that path then determines the difficulty of the complete puzzle. Here is the list in question: https://github.com/SudokuMonster/SukakuExplainer/wiki/Difficulty-Ratings-in-Sukaku-Explainer-v1.17.8