Rotating-Partner Tournaments — Solo Sign-Up Mixers

A tournament registration mode where players sign up alone instead of with a partner. The system generates a round-robin schedule that rotates partner pairings every round; per-player standings feed an automatic playoff bracket. Available on every plan. This update is designed for tournament organizers and players who want a better tournament play experience — less manual work, more control, and a smoother workflow.

What's Included

New Registration Mode row in the tournament wizard's Default Format step — Pre-formed Team / Rotating Partners

Picking Rotating Partners auto-couples the bracket type to Round Robin (the only compatible format) and disables MLP / Team Captain

Per-division override available — mix a Doubles + Rotating Partners division with a regular Doubles + Pre-formed Team division in the same event

Player registration overlay (web + mobile) skips the partner-selection step entirely for individual_rotating divisions; backend forces registration_type='individual'

Schedule generator runs the 1-factorization of K_n algorithm to maximize unique partnerships within the roster (8/16/24-player rosters ideal)

Audit page surfaces conflicts (player in two simultaneous matches), partner duplications (same pair twice), and opponent-imbalance variance before publish

Score submission uses a winning_side + points API — no team_one_id/team_two_id required because partnerships are dynamic per match

Per-player standings (W / L / PF / PA / Differential / Rank) on the public division show page Standings tab; mobile parity

One-click playoff generation pairs the top finishers (high-low default) into stable teams, builds a single-elim bracket, fans out push notifications

Match-completion + court-assigned push notifications resolve recipients via tournament_match_participants — no team rows required

Late registration blocked once the schedule generates (the rotation table can't be extended without regeneration); player sees a clear 'Registration closed' message

Full E2E spec walks creation → 8 registrations → schedule → score every match → standings → playoff → champion. 155+ specs covering API, mailer, badge evaluation, Command Center rendering, and full integration paths

Why This Matters

Rotating-Partner Tournaments — Solo Sign-Up Mixers addresses a real need for tournament organizers and players. A tournament registration mode where players sign up alone instead of with a partner. The system generates a round-robin schedule that rotates partner pairings every round; per-player standings feed an automatic playoff bracket. Available on every plan. By building this directly into the platform, tournament organizers and players save time and get a more reliable experience — no workarounds, no third-party tools, no spreadsheets.