danesabo/PickleBALLER
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8 Commits

Author SHA1 Message Date
Split
539c1c9d08 Update player list and profile pages to show unified ELO rating 2026-02-26 12:22:17 -05:00
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39ece00b36 Update all leaderboards and summaries to use unified rating (singles_rating) 2026-02-26 12:17:03 -05:00
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189ea1b037 Refactor: unified rating (use singles_rating for all matches, update leaderboard) 2026-02-26 12:15:00 -05:00
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16e21346c2 Fix elo_analysis: use correct timestamp column, show real ratings 2026-02-26 11:55:40 -05:00
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42d0269e56 Major refactor: Convert from Glicko-2 to pure ELO rating system 
- Created new ELO module (src/elo/) with:
  - Simple rating-only system (no RD or volatility tracking)
  - Standard ELO expected score calculation
  - Per-point performance scoring
  - Effective opponent formula for doubles
  - Full test suite (21 tests, all passing)

- Updated main.rs to use ELO calculator:
  - Per-point scoring: performance = points_scored / total_points
  - Effective opponent in doubles: Opp1 + Opp2 - Teammate
  - K-factor = 32 for casual play

- Created analysis tool (src/bin/elo_analysis.rs):
  - Reads match history from database
  - Recalculates all ratings using pure ELO
  - Generates before/after comparison (JSON + Markdown)

- Updated documentation:
  - New LaTeX report (rating-system-v3-elo.tex)
  - Simplified explanations (no volatility/RD complexity)
  - Plain English examples and use cases
  - FAQ section

- All tests passing (21/21 ELO tests)
- Code compiles without errors
- Release build successful
 2026-02-26 11:35:07 -05:00
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9ae1bd37fd Refactor: Implement all four ELO system improvements 
CHANGES:

1. Replace arbitrary margin bonus with per-point expected value
   - Replace tanh formula in score_weight.rs
   - New: performance = actual_points / total_points
   - Expected: P(point) = 1 / (1 + 10^((R_opp - R_self)/400))
   - Outcome now reflects actual performance vs expected

2. Fix RD-based distribution (backwards logic)
   - Changed weight from 1.0/rd² to rd²
   - Higher RD (uncertain) now gets more change
   - Lower RD (certain) gets less change
   - Follows correct Glicko-2 principle

3. Add new effective opponent calculation for doubles
   - New functions: calculate_effective_opponent_rating()
   - Formula: Eff_Opp = Opp1 + Opp2 - Teammate
   - Personalizes rating change by partner strength
   - Strong teammate → lower effective opponent
   - Weak teammate → higher effective opponent

4. Document unified rating consolidation (Phase 1)
   - Added REFACTORING_NOTES.md with full plan
   - Schema changes identified but deferred
   - Code is ready for single rating migration

All changes:
- Compile successfully (release build)
- Pass all 14 unit tests
- Backwards compatible with demo/example code updated
- Database backup available at pickleball.db.backup-20260226-105326
 2026-02-26 10:58:10 -05:00
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d4c0bb889b docs: comprehensive documentation for all modules and handlers 
- README.md: full project docs with features, API endpoints, Glicko-2 explanation
- main.rs: doc comments for all 18 HTTP handlers
- db/mod.rs: schema and migration documentation
- models/mod.rs: Player struct and Glicko-2 parameter docs
- Fixed route syntax (:id instead of {id}) for Axum 0.7 compatibility
 2026-02-07 19:19:50 -05:00
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ada961f35d Initial commit: Pickleball ELO Tracker with Glicko-2 2026-02-07 18:45:31 -05:00