Uitbraak: een ziekte op het veld

A dice game about a plant disease (potato blight) spreading over a field,
for a project on epidemics (groep 7-8). The field is 6 by 6 squares, A-F
and 1-6, with a chip on each sick plant. Each round the pupil rolls once for
every red chip: 1 up, 2 right, 3 down, 4 left, 5 or 6 no wind. An empty
square there gets an orange chip (just sick); at the end of the round the
orange chips turn red. Blue chips are protected plants and never get sick.
The log on the answer sheet holds, per round, the newly sick plants and the
total. The point is growth that speeds up (every sick plant makes more sick
plants) and then slows down as the field fills, and where protection helps.

It is a game plugin (docs/game-plugins.md): no key, and the log is checked
row by row. The rolls are not in the log (one per sick plant, up to 30 in a
round), so a row can't be replayed; what is checked is what must hold
whatever the dice did: no more newly sick plants than there were sick
plants (each rolls once), nor than there are empty squares, and the total is
the total before plus the newly sick. The booklet gets the round's steps and
the field with the start chips, to copy on card and laminate.

`start` puts the red chips (default C3), `protected` blue chips the bundle
places. With `protect`, the pupil places that many blue chips where they
like, before rolling in round `protectRound` (default 2); the test games
then play three placements: around the sick plants, in the middle of the
field, and as a wall next to them. Add a `solution`, a few example rounds
with one roll per red chip in reading order (A1, B1, … A2, …): the teacher
manual tells them round by round and shows them in the log.

The material set has 20 chips per colour; the report says how often a game
needs more than 20 red chips.