55 lines
1.9 KiB
Markdown
55 lines
1.9 KiB
Markdown
# Rating System Comparison: Glicko-2 vs Pure ELO
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## Overview
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This analysis replays all historical matches through the new ELO system to compare ratings.
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**Key differences:**
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- **Old system:** Glicko-2 with separate singles/doubles ratings, RD, volatility
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- **New system:** Pure ELO with unified rating, per-point scoring, effective opponent formula
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## Summary
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- **Total Players:** 6
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- **Total Matches Replayed:** 29
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- **K-Factor:** 32
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- **Analysis Date:** 2026-02-26 11:55:18
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## Ratings Comparison (Sorted by New ELO)
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| Rank | Player | Glicko-2 Avg | New ELO | Diff | Matches |
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|:----:|--------|-------------:|--------:|-----:|--------:|
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| 1 | Andrew Stricklin | 1651 | 1538 | -113 | 19 |
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| 2 | David Pabst | 1562 | 1522 | -40 | 11 |
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| 3 | Jacklyn Wyszynski | 1557 | 1514 | -43 | 9 |
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| 4 | Eliana Crew | 1485 | 1497 | +11 | 13 |
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| 5 | Krzysztof Radziszeski | 1473 | 1476 | +3 | 25 |
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| 6 | Dane Sabo | 1290 | 1449 | +159 | 25 |
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## Key Insights
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### Biggest Winners (rating increased)
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- **Dane Sabo**: +159 points (Glicko avg 1290 → ELO 1449)
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- **Eliana Crew**: +11 points (Glicko avg 1485 → ELO 1497)
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- **Krzysztof Radziszeski **: +3 points (Glicko avg 1473 → ELO 1476)
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### Biggest Losers (rating decreased)
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- **Andrew Stricklin**: -113 points (Glicko avg 1651 → ELO 1538)
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- **Jacklyn Wyszynski**: -43 points (Glicko avg 1557 → ELO 1514)
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- **David Pabst**: -40 points (Glicko avg 1562 → ELO 1522)
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## Why Ratings Changed
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The new system differs in several ways:
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1. **Per-point scoring**: Instead of just win/loss, we use `points_won / total_points`. Winning 11-9 gives less credit than winning 11-2.
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2. **Effective opponent formula**: In doubles, your effective opponent is calculated as `Opp1 + Opp2 - Teammate`. This means:
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- Strong teammate → lower effective opponent → less credit for winning
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- Weak teammate → higher effective opponent → more credit for winning
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3. **Unified rating**: Singles and doubles contribute to one rating instead of two.
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