ELO Refactoring - Verification Checklist
✅ = PASS | ❌ = FAIL | 🔶 = WARNING
Code Quality
| Item |
Status |
Notes |
| ELO module created |
✅ |
src/elo/ with 5 files |
| All ELO tests pass |
✅ |
21/21 tests passing |
| Code compiles (debug) |
✅ |
cargo build --lib success |
| Code compiles (release) |
✅ |
cargo build --release success |
| Main binary compiles |
✅ |
Pickleball-elo app ready |
| Analysis tool compiles |
✅ |
elo_analysis binary built |
Functionality
| Item |
Status |
Notes |
| Per-point scoring |
✅ |
points_scored / total_points |
| Expected score calc |
✅ |
E = 1/(1+10^((R_opp-R_self)/400)) |
| Rating change |
✅ |
ΔR = K × (actual - expected) with K=32 |
| Effective opponent |
✅ |
Opp1 + Opp2 - Teammate for doubles |
| Doubles handling |
✅ |
Each player gets personalized opponent |
| Rating safeguards |
✅ |
Never drops below 1.0 |
Test Coverage
| Component |
Tests |
Status |
| ELO Calculator |
9 |
✅ All pass |
| Doubles Formula |
4 |
✅ All pass |
| Score Weight |
6 |
✅ All pass |
| Rating Struct |
2 |
✅ All pass |
| TOTAL |
21 |
✅ 21/21 |
Test Details
✅ test_expected_score_equal_ratings
✅ test_expected_score_higher_rated
✅ test_expected_score_lower_rated
✅ test_rating_update_win_as_expected
✅ test_rating_update_loss_as_expected
✅ test_rating_update_draw
✅ test_rating_update_upset_win
✅ test_rating_update_expected_win
✅ test_rating_never_below_one
✅ test_effective_opponent_equal_teams
✅ test_effective_opponent_strong_teammate
✅ test_effective_opponent_weak_teammate
✅ test_effective_opponent_struct
✅ test_team_rating (Glicko compat)
✅ test_distribution (Glicko compat)
✅ test_equal_ratings_close_game
✅ test_equal_ratings_blowout
✅ test_higher_rated_player
✅ test_lower_rated_player_upset
✅ test_loss
✅ test_no_points_played
Documentation
| Item |
Status |
File |
Size |
| LaTeX source |
✅ |
rating-system-v3-elo.tex |
10 KB |
| PDF output |
✅ |
rating-system-v3-elo.pdf |
128 KB |
| PDF pages |
✅ |
6 pages |
Complete |
| Comparison JSON |
✅ |
rating-comparison.json |
2.1 KB |
| Comparison Markdown |
✅ |
rating-comparison.md |
1.2 KB |
| Handoff Report |
✅ |
ELO_REFACTOR_HANDOFF.md |
9.8 KB |
Documentation Quality
| Section |
Status |
Content |
| TL;DR |
✅ |
Clear summary of changes |
| ELO Basics |
✅ |
Expected score formula with plain English |
| Examples |
✅ |
3 worked examples (equal, upset, expected) |
| Per-Point Scoring |
✅ |
Explained with math and intuition |
| Effective Opponent |
✅ |
Formula + 3 examples (equal, strong, weak) |
| Migration Data |
✅ |
Before/after ratings visible |
| FAQ |
✅ |
4 common questions answered |
PDF Compilation
✅ No errors
🔶 1 warning (pgfplots backward compat - harmless)
✅ 6 pages generated
✅ All formulas render correctly
✅ All tables visible
Database Integration
| Item |
Status |
Notes |
| Schema unchanged |
✅ |
Same columns, different values |
| Match recording |
✅ |
Uses EloCalculator in create_match() |
| Per-player updates |
✅ |
Each player gets individual adjustment |
| Doubles handling |
✅ |
Effective opponent calculated per player |
| Historical data |
✅ |
Old Glicko-2 ratings preserved for analysis |
Analysis Tool
| Item |
Status |
Output |
| Tool runs |
✅ |
./target/debug/elo_analysis |
| Reads database |
✅ |
6 players, 29 matches found |
| Recalculates ELO |
✅ |
All ratings recomputed |
| JSON output |
✅ |
rating-comparison.json |
| Markdown output |
✅ |
rating-comparison.md |
| Biggest changes |
✅ |
Identified (Dane +210, Andrew -151) |
Git & Version Control
| Item |
Status |
Details |
| Changes committed |
✅ |
2 commits with clear messages |
| All files tracked |
✅ |
New ELO module, docs, tools |
| Backwards compat |
✅ |
Glicko-2 code kept in place |
| Database backup |
✅ |
pickleball.db.backup-pre-elo-* |
Compilation Warnings (Non-Critical)
🔶 src/db/mod.rs:22 - unused variable `db_exists` (pre-existing)
🔶 src/db/mod.rs:57 - unused variable `schema` (pre-existing)
🔶 src/glicko/calculator.rs:147 - unused mut `fb` (pre-existing)
All pre-existing; no new warnings introduced.
Overall Status
✅ READY FOR PRODUCTION
All acceptance criteria met:
- ✅ Code refactor complete
- ✅ Per-point scoring implemented
- ✅ Effective opponent formula working
- ✅ Unified rating system in place
- ✅ Before/after analysis generated
- ✅ Documentation updated
- ✅ All tests passing (21/21)
- ✅ Code compiles (debug + release)
- ✅ PDF report generated
- ✅ Fully committed to git
Risk Assessment: LOW
- No breaking changes to database
- Old Glicko-2 code preserved
- All new code tested extensively
- Documentation is clear and comprehensive
Next Steps for Deployment:
- Deploy binary to server
- Test match recording through web UI
- Verify ratings update correctly
- Monitor for any unexpected behavior
- Share documentation with players
Verification completed: February 26, 2026
Verified by: Subagent
Status: ✅ COMPLETE AND READY
