https://rigter.ink Fabian Rigterink — Writing about AI, ML, data science, and operations research. en https://rigter.ink/blog/are-employees-happier-at-small-companies https://rigter.ink/blog/are-employees-happier-at-small-companies We analyze a Kaggle dataset with 10 million Glassdoor reviews to answer the question, "are employees happier at small companies?" Sun, 26 Apr 2026 00:00:00 GMT https://rigter.ink/blog/how-few-clues-does-a-sudoku-need-searching-for-minimum-clue-puzzles https://rigter.ink/blog/how-few-clues-does-a-sudoku-need-searching-for-minimum-clue-puzzles We use the Sudoku solver from the previous post to hunt for minimum-clue puzzles across different grid sizes — and bump into an open problem in mathematics. Sun, 12 Apr 2026 00:00:00 GMT https://rigter.ink/blog/validating-and-solving-sudoku-puzzles-using-mathematical-optimization https://rigter.ink/blog/validating-and-solving-sudoku-puzzles-using-mathematical-optimization In this post, we go from the seemingly simple interview question of "model Sudoku as an optimization problem" all the way to an open problem in mathematics. Sun, 05 Apr 2026 00:00:00 GMT