The Einstein riddle, solved step by step
The fifteen clues, the full solution and the entire chain of reasoning, without guessing once. Including why the story that Einstein wrote it is untrue.
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On logic puzzles
How these puzzles work from the inside, how they get solved, and why you sometimes get stuck. Written by the person who programs the generator, so there is a fair amount of kitchen talk.
What logic grid puzzles are
Where they come from, how they differ from sudoku, and what separates a well-built puzzle from one that forces you to guess.
Read →Four deduction techniques
Cross elimination, contagion between linked elements, reasoning by ranges, and proof by contradiction. With when to use each one and when not to.
Read →The five mistakes that get you stuck
Why you hit a wall, and why it almost never has anything to do with how clever you are. Five concrete habits and how to fix them.
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