A game is one table of players on one island. The score is
how much of the trade that was there for the taking they actually took:
0% is everyone staying home and never trading at all,
100% is a perfect day where nothing was left on the table.
A minus score means they traded themselves into a worse spot than if they
had done nothing — which happens, and is not hidden here.
Games are only ever placed against the same size of island:
the place column says where a game came on its own format,
because two traders and four traders are not the same puzzle. The list is
sorted by score so you can read down it.
Best players
Each player is scored against themselves: how much better they
ended up than if they had never traded with anyone.
1.00× is the line — below it they would have been better
off alone. The place goes to a player's best game, because
a high score is a high score; the typical and the worst sit beside it so
you can see whether the best was one lucky day or how they always play.
Formats — the record on each size of island
Each format is its own contest: more traders, more goods or more days make
a different puzzle, so each keeps its own record holder.
How the score is worked out
Every island has a floor (what the traders would get with no trade
at all) and a ceiling (the best any set of trades could possibly do).
The score is where the day landed between those two, so a generous island
and a stingy one can sit on the same board. Nothing is taken on trust:
every score here is re-computed from the island's seed and the record of
what was traded.