Play with it

One page per chapter. Every number in the article is a control on one of these.

• 0 · The record table, one color at a timeThe sixteen-person, three-color table from 1955, still unbeaten. The slider isolates one color's net.
• 1 · Try to break the pentagonThe five-person table, safe with two colors. Click any string to swap its color.
• 2 · Six people, and no way outSix people, two colors, and every string clickable. The triangle count can never reach zero.
• 3 · Grow the table toward the recordThe first n people of the sixteen-person table. A safe table stays safe when people leave, so every size up to sixteen is safe.
• 4 · Measure any table in people per colorThe scoring rule behind the whole question: a table's rate is the number that, multiplied by itself once per color, gives the table size.
• 5 · Multiply two safe tablesPick the two factors. The product keeps outer colors between rooms and gives each room fresh inner colors, and this page re-checks every triangle of the result, live.
• 8 · Test the parity ruleOne color, three rooms. Toggle which rooms hold the color, and watch which walls a string of that color may cross.
• 9 · Spring the trap, then obey the ruleThe pentagon room, its red net, and an outsider sending in two red strings. You choose where they land.
• 10 · Interrogate the referee's cardThe actual thirteen-row card this repository found. Click columns to choose four of them.
• 12 · Beat the channel with longer wordsThe noisy five-symbol channel: each symbol can be heard as either neighbour. Pick any two of the five two-letter codewords.

Each page is self contained: no libraries and no network, so they work offline and from a file.