Philosophy
What pencilmark's numbers mean: band, difficulty and time, and the rules its formats follow.
How a card is computed
Every stage from a puzzle to its band, technique list, difficulty and time, with the formulas and where each number comes from.
Techniques
Every technique code on the card, by family, with its band and links to explainer sites.
Benchmark
How well pencilmark's difficulty and time follow real solve times, against other graders, on a frozen held-out set.
Experiment log
Every substantial experiment behind pencilmark, what we measured and whether it worked, including the ideas we dropped.
Glossary
The words these pages use, in one place.