The Little League Baseball World Series runs two independent 10-team
double-elimination brackets — United States and International — each
producing a side champion, then a World Championship game and a
Consolation Third Place game between the side runners-up. 38 games in
all. No existing template could express it: every one is single
elimination, at most with a bolted-on third-place game.
Adds the llws_20 template plus dedicated generation and advancement,
following the same bespoke-routing pattern afl_10 and nba_20 use rather
than the generic ceil(matchNumber / 2) advancement.
The core of the change is loser routing. In the winners bracket a loss
is not an elimination — it drops the team into the elimination bracket
at a specific slot, including the deliberate cross-overs the official
bracket uses (Elimination Round 1 pairs L4/L6 and L2/L8; Elimination
Round 3 pairs each semifinal loser with the winner from the opposite
half). In the elimination bracket a loss is final. Matching the official
modified double-elimination format, there is no "if necessary" game: the
winners-bracket champion is eliminated if it loses the side
championship, dropping to the consolation game.
Rounds are shared across both sides, U.S. taking the low match numbers
and International the high ones, so the scoring config stays one entry
per stage. The existing phases/groups display machinery splits them back
apart into United States / International / Championship tabs.
Scoring lands on exactly 8 point-earning teams, which is the field size
when Elimination Round 4 begins: the two finals decide 1st–4th,
Elimination Final losers take 5th–6th, and Elimination Round 4 losers
7th–8th. 3rd and 4th are distinct because the consolation game is real,
and 5–8 splits into two two-team tiers so surviving Elimination Round 4
is worth more than losing it.
Also:
- Adds an optional nonScoringWinnerFloor to BracketRound. The engine
hardcoded a 5th-place floor for winners of non-scoring rounds feeding
a scoring one, which is wrong inside a losers bracket where a win can
guarantee only 7th. Opt-in, so no existing template changes behavior.
- Fixes TabbedBracketLayout's mobile path, which built its match map
unfiltered and so would have merged U.S. and International games into
one column. No-op for NCAA and NBA, whose groups already cover every
match in their phases.
- Rewrites the LLWS Monte Carlo simulator, which still modelled the
retired pool-play format (5 teams per pool, then a 4-team bracket per
side) and no longer described the tournament being scored. It now runs
the real 10-team double elimination and splits the 5–8 probabilities
into the correct tiers instead of one even four-way split. Legacy
"US:A"/"Intl:B" externalIds are still accepted, read as the side
alone, so seasons configured for the old format keep loading.
Tests replay all 38 games through the pure advancement resolver and
assert each one against the feed labels printed on the official bracket.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EAxqBVzfmKJe6WQ6VF9guj
* Add FIFA World Cup 2026 support with group stage display and Monte Carlo simulator, fixes#127
- New `groupStageMatches` table for recording group play results (W/D/L, scores, matchday, schedule)
- `computeGroupStandings()` model function: pts → GD → GF → name tiebreaker ordering
- `GroupStageStandings` component showing all 12 groups with standings table and manager column
- Admin bracket UI: group match score entry, per-group standings, "Recalculate Floors" action
- `WorldCupSimulator`: 50k Monte Carlo covering group stage + best-8 3rd-place + knockout + 3rd place game
- Fuzzy name matching for national team Elo lookup (exact → substring → word-overlap), warns on miss
- Partial group completion: completed matches replayed with real scores, remaining matches simulated
- Elo priority: admin-entered sourceElo > futures odds converted to Elo > hardcoded national team ratings
- `fifa_48` bracket template: added Third Place Game round with `loserFeedsInto` on Semifinals
- Scoring rules: distinct 3rd/4th place for `fifa_48` (not averaged), QF losers share 5th–8th equally
- Floor scoring: SF participants guaranteed 4th (provisional), finalized after 3rd place game
- `recalculate-floors` admin action deletes and replays all results from scratch (fixes stale guard bug)
- Unique index on `(tournamentGroupId, participant1Id, participant2Id)` to prevent duplicate pairings
- Batch `findMatchesByGroupIds()` replacing N sequential queries in the sport season loader
- League home mini-standings now shows `actualPoints` (includes floor) instead of `totalPoints` only
- Elo ratings admin page supports World Cup (same bulk-import flow as snooker)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* Fix TypeScript errors: update GroupStandingData type to use findMatchesByGroupIds
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* Increase Node heap to 4GB for unit tests in CI to prevent OOM
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* Fix OOM in CI: make WorldCupSimulator simulation count configurable for tests
Tests now pass numSimulations=500 instead of the production default of 50,000.
Six simulator tests × 50k iterations each was exhausting the 4GB heap on GitHub
Actions runners. Also reduce simGroupMatch stat tests from 50k to 5k iterations.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---------
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
- NCAAM R64/R32 winners no longer receive T5 floor points; only Sweet
Sixteen winners entering the first scoring round get a floor
- AFL T5-T6 and T7-T8 score as separate tiers (avg([5,6]) and avg([7,8]))
instead of one shared avg([5-8]) pool
- Eliminated teams now always show their correct final rank (e.g. T33 for
NCAAM R64 losers) even during partial round scoring, by deriving the
rank label from the total match count per round rather than the dynamic
still-alive count
- Discord notifications now fire when a drafted participant is eliminated
with 0 points (e.g. R64 losers whose team score doesn't change)
- Discord notifications no longer include all prior matches — scoped to
the current batch via matchIds
- Discord section headers have spacing; rank medals replaced with numbers
- Rounds auto-complete when all matches are marked done; manual Complete
Round dropdown removed
- Fixed double Discord notification when the last match in a round
triggers auto-complete: processPlayoffEvent now accepts skipRecalculate
so the caller controls when the notification fires
- Fixed falsy check on finalPosition=0 in calculateTeamScore
- Undrafted 0-point participants filtered from Eliminated Teams display
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
When a participant wins a bracket round, they immediately earn provisional
"floor" points (the averaged minimum they'd receive if eliminated next round).
These update as they advance and are replaced by finalized scores on elimination.
Key changes:
- Add `is_partial_score` column to `participant_results` (migration 0038)
- `processPlayoffEvent`: assign provisional position 5 to non-scoring round
winners; assign round-appropriate floors to scoring round winners via
`getGuaranteedMinimumPosition`; add catch-all for unrecognized round names
- `upsertParticipantResult`: guard against un-finalizing rows (never overwrite
isPartialScore=false with true)
- `calculateBracketPoints`: new function averaging tied bracket tiers
(5-8 → 20 pts, 3-4 → avg, 1-2 solo); used in `calculateTeamScore` for
playoff_bracket pattern (pattern-aware, doesn't affect F1/golf scoring)
- `PlayoffBracket`: "In Contention" table for still-active participants;
AFL double-chance fix (participants who won a later match excluded from
earlier round's loser list); correct `nextRank` starting position
- Server loader: batch owner DB queries (one query vs N+1); deduplicate
participantPoints; use calculateBracketPoints for bracket point display
- Clean up Phase/Q-number tracking comments throughout scoring-calculator.ts
- 3 new tests for non-scoring round provisional floor behavior
Also includes a dev admin bypass via DEV_ADMIN_CLERK_ID env var (separate
change on this branch, not part of floor scoring feature).
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
- Created ScoringRulesEditor component with 8 placement point inputs
- Added scoring-types.ts for shared client/server types
- Integrated scoring rules into league settings page
- Integrated scoring rules into league creation form
- Added validation for point values (0-1000 range)
- Disabled editing in settings after draft starts
- Included helpful tips and preview display
Phase 1.3 complete
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
