Duels

One trader against one, over a window you both agreed to. It is scored off the account you already entered the season with, so there is nothing new to fund and nothing new to learn: trade exactly as you would have, and at the end the two returns are compared and both are sealed.

Reading duels.

How it is scored

Your whole account, at both ends.
SOL in hand plus every open position marked at what it is worth, read by the same code the leaderboard uses. A duel that invented its own idea of what an account is worth would eventually disagree with the board about who is ahead, and then neither number is worth anything.
The clock starts on accept.
Not when the offer was sent. Both accounts are measured at the moment the second person says yes, so nobody gets a head start by sitting on an offer while a position runs.
A position nobody can price is counted at cost.
The same fallback the all-time board uses. It is not a price, so a duel that leaned on one says so on the result rather than presenting a figure that is part measurement and part assumption without saying which.
One duel at a time.
Two live duels scored off one account would both be measuring the same trades, so a single good fill would win both. That is enforced by the database, not by this sentence.
Nothing about it changes a fill.
The same latency, the same slippage, the same price impact ceiling. A duel trade is an ordinary season trade that counts toward the leaderboard exactly as it would have, and it can be verified the same way.