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9ae1bd37fd
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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
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2026-02-26 10:58:10 -05:00 |
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