Initial VIPR
4.0090
Registry seed
Current VIPR
3.9989
After latest rated game
Net Movement
-0.0101
Current minus initial
Record
4-4
50% win rate · 8 rated games
Storyline
Tony Birchall entered VIPR with an initial registry rating of 4.0090. Across 8 rated doubles games, the player went 4-4 and moved -0.0101, finishing at 3.9989.
Why It Moved
AI-generated explanation: The 4-4 record produced +0.0392 from wins and -0.0493 from losses, for a net move of -0.0101. The biggest single-game impact was -0.0165 against James Peavley as partner and Mike Fritz / John Gralton as opponents. In game #4 on 2026-10-13, VIPR expected the player's team to have the edge, so the loss carried a larger drop: player team 3.7769 vs opponent team 3.5087.
Partner Chemistry
Partnership patterns are starting to emerge.
Tony's most common partner signals so far: Gene Konzen (2-0, 100%), James Peavley (1-1, 50%), Sue Dahl (1-1, 50%), Doug Kellogg (0-1, 0%). No partnership has reached both the 8+ match and 75%+ win-rate marker yet, so treat this as directional.
Streaks & Rivalries
Rivalry
Tony has faced Douglas Starn 4 times - record: 3-1. Clear ownership of the matchup.
Session Summary
| Date | W-L | Start | End | Net |
|---|---|---|---|---|
| 2026-10-13 | 1-3 | 4.0090 | 3.9842 | -0.0248 |
| 2026-10-20 | 3-1 | 3.9842 | 3.9989 | +0.0147 |
Game-By-Game Rating Trail
| # | Date | Result | Score | Partner | Opponents | Before | Change | After |
|---|---|---|---|---|---|---|---|---|
| 1 | 2026-10-13 Santiago Club - Team 3 vs Team 4 |
Loss | 10-21 | Tom Hertz | Chris Eversole / Mike Fritz | 4.0090 | -0.0089 | 4.0001 |
| 2 | 2026-10-13 Santiago Club - Team 3 vs Team 4 |
Loss | 16-21 | Sue Dahl | Nancy OBrien / Mike Fritz | 4.0001 | -0.0101 | 3.9900 |
| 3 | 2026-10-13 Santiago Club - Team 3 vs Team 4 |
Win | 22-20 | Gene Konzen | Stephen Bussey / Mike Fritz | 3.9900 | +0.0107 | 4.0007 |
| 4 | 2026-10-13 Santiago Club - Team 3 vs Team 4 |
Loss | 17-21 | James Peavley | Mike Fritz / John Gralton | 4.0007 | -0.0165 | 3.9842 |
| 5 | 2026-10-20 Santiago Club - Team 3 vs Team 1 |
Win | 21-18 | James Peavley | Douglas Starn / Kevin Eisemon | 3.9842 | +0.0106 | 3.9948 |
| 6 | 2026-10-20 Santiago Club - Team 3 vs Team 1 |
Win | 21-14 | Gene Konzen | Paul Randour / Douglas Starn | 3.9948 | +0.0078 | 4.0026 |
| 7 | 2026-10-20 Santiago Club - Team 3 vs Team 1 |
Loss | 18-21 | Doug Kellogg | Greg Dodge / Douglas Starn | 4.0026 | -0.0138 | 3.9888 |
| 8 | 2026-10-20 Santiago Club - Team 3 vs Team 1 |
Win | 21-12 | Sue Dahl | Mary Seifert / Douglas Starn | 3.9888 | +0.0101 | 3.9989 |
Formula Homework
These rows show the team ratings used in the adjustment calculation. The computed delta is the signed rating change produced by the current v0.6 formula.
| # | Player Team ( AVG ) | Opponent Team ( AVG ) | Winner-Loser VIPR Diff | Computed Delta |
|---|---|---|---|---|
| 1 | 4.1152 | 4.1522 | +0.0370 | -0.0089 |
| 2 | 3.9671 | 3.9638 | -0.0033 | -0.0101 |
| 3 | 4.0032 | 4.0264 | -0.0232 | +0.0107 |
| 4 | 3.7769 | 3.5087 | -0.2682 | -0.0165 |
| 5 | 3.7539 | 3.7752 | -0.0213 | +0.0106 |
| 6 | 4.0124 | 3.9360 | +0.0764 | +0.0078 |
| 7 | 4.0801 | 3.9420 | -0.1380 | -0.0138 |
| 8 | 3.9429 | 3.9464 | -0.0036 | +0.0101 |
Rating movement formula
Team VIPR = average - (average - lower partner) * CRF, with CRF = 0.40.
Adjustment = 0.02 / (1 + 10 ^ (2.5 * (winner team VIPR - loser team VIPR))).
Winning partners both receive +adjustment. Losing partners both receive -adjustment.
Score margin is recorded for context but is not currently part of the v0.6 formula.
First game check: winner-loser VIPR diff +0.0370 -> computed delta -0.0089; 4.0090 -0.0089 = 4.0001