Rank converter

Bridge players are the whole mechanism: accounts that hold a ranked seat on two servers at once — the same person playing both, or a professional's boot-camp account on a second server. Comparing where the SAME player sits on each ladder gives a real offset between two servers directly, not a guess at who is better.

The offset for each server is fit by a robust regression (Huber-IRLS) over every bridge pair we found, anchored to EUW at zero. A server bridged at many skill levels gets an offset that changes with rank — measured from Gold to Diamond and held there above it, so on most servers the gap at Master is wider than at Emerald. One bridged only at the very top — the only way to reach Korea's ladder at all, since no Korean account in this data has ever appeared on another server — gets a single flat number instead of a guess at how the gap moves lower down. Under each equivalent is the range the two servers' own 95% intervals allow.

Korea and China hold no ordinary bridge players, so their rows are marked ESTIMATED: built instead from how professional teams from those regions perform against teams whose ladder IS bridged, with a wider confidence interval to show the extra uncertainty. Every other server is MEASURED directly from real dual-ladder accounts.

This is a conversion, not a rating. Every input is a rank you already hold on Riot's own ladder — server, tier, division, LP — and every answer is the rank that matches it on another server. Nothing here reads your games, estimates your skill or ranks you against other players.