Race prediction challenge.

Everyone in a round answers the same three questions: race winner (5 points), the named contender on the podium (3), and the named midfield driver in the top ten (2). Yes and No have equal scoring. The named drivers and rules freeze before the round opens.

Pre-weekend entries close five minutes before FP1. Grid-confirmed entries close five minutes before the Grand Prix and open only with an eligible grid and forecast. Earlier verified running or an earlier schedule correction closes play sooner. A delay never extends an opened deadline. Entries can be edited until the server deadline; equality is closed.

At lock we use your last server-accepted revision strictly before the effective deadline, and freeze the latest eligible same-stage model forecast published before that deadline. Its input cutoff must be within the declared freshness limit: seven days for pre-weekend, 48 hours for grid-confirmed. Fan and model answers use the same questions and 5/3/2 score. Model Yes means probability at least 50%; top-ten probability comes from the stored finishing distribution. Forecasts are conditional on starting and do not estimate nonstart risk.

If no eligible fresh benchmark exists, your entry can receive a fan score without a fair model comparison. We never use a retrospective or later forecast as its benchmark. Official classified finishing positions count, including classified retirements; disqualified drivers and nonstarters cannot satisfy a podium/top-ten question.

We never reopen a locked round or silently replace its named drivers. A changed entrant field, cancellation or an unresolvable fairness failure voids the round. A missing outcome voids only its affected question; receipts show earned and available points. An entry with no eligible revision before an earlier effective deadline receives no score. Provisional scores can change; a corrected classification produces a new receipt revision and replaces the current score, without adding points twice.

Guest entries belong to your secure browser session. Losing that session may make them unrecoverable. Optional verified account access is separate from newsletter or measurement consent. When a guest and account both entered a round, the earliest server-accepted entry wins, ordered by entry ID on an exact time tie; its locked answers remain. The duplicate is preserved as excluded. This rule never selects the higher score.

Stages have separate season totals: sum of earned points and available points, with rounds played shown. There is no percentage normalization, wager, prize or implied audience ranking. Legacy winner polls are separate and do not create challenge histories.