Bethesda - Chevy Chase HS '20
How much better or worse boats do with this sailor crewing than their skipper's rating predicts, shown on the skipper scale so crews can be lined up across teams. Percentiles compare against rostered crews that season (league) or teammates (team).
How crew ratings work →Crew effect over their whole career, not scaled to a team: 99.17 percentile among ICSA crews with 30+ races. Uncertainty ±0.089 rating points from 303 races with rated skippers.
How crew ratings work →Includes linked high school and college seasons.
| Season | Team | Rating | Range | League percentile |
Team percentile |
On team | Races | Team page |
|---|---|---|---|---|---|---|---|---|
| Fall 2024 | Connecticut College | 4.75 | 96.76 | 95.00 | 1 of 10 | 9 | Team page | |
| Fall 2022 | Connecticut College | 5.82 | 99.09 | 96.43 | 1 of 14 | 9 | Team page |
A team race rating is what the sailor brings to one of the three boats: 0.72 x their fleet rating plus a team-race offset learned from every match they sailed, shrunk toward zero so a few matches cannot move it far. Sides are compared by the sum of their three boats plus the school's team race strength.
| Rating | Rank | vs fleet rating | Record |
|---|---|---|---|
| 1.26 (fleet 2.04) | unranked (fewer than 30 matches as skipper, or not active) | −0.01 ± 0.18 about what the fleet rating predicts |
as skipper 23–16 (59%) as crew 66–47 (58%) |
| Season | Regattas | Skipper W–L | Crew W–L |
|---|---|---|---|
| Spring 2021 | 2 | 22–12 | — |
| Spring 2020 | 1 | — | 2–4 |
| Fall 2019 | 3 | — | 18–6 |
| Spring 2019 | 4 | 1–4 | 21–20 |
| Fall 2018 | 3 | — | 17–8 |
| Spring 2018 | 2 | — | 8–9 |
For each regatta, the boat value that would have made this sailor's record least surprising: the shift applied to their boat alone, in the matches they sailed, with team-mates and opponents fixed at the pre-event forecast. A boat's skipper and crew share the boat, so they get the same number when they sailed every match together. Surprise is in bits at the pre-event value minus at the performance value; P(this good or better) treats the matches as independent at the forecast probabilities. Regattas forecast from fewer than 1,000 training matches are left out.
Over 15 graded regattas (152 matches) the record is 89–63 against 86.5 wins the pre-event forecasts expected (+2.5). 3 regattas clearly above the rating (P ≤ 20%), 4 clearly below (P ≥ 80%); 22 bits of surprise in all.
| Date | Regatta | Role | Value | Perf. | Record | Exp. wins |
Δ | Surprise (bits) |
P(this good or better) |
|---|---|---|---|---|---|---|---|---|---|
| 2021-04-24 | MASSA Baker Team Race Qualifiers | skipper | 1.73 | 1.51 | 14–10 | 14.8 | −0.22 | 0.1 | 73% |
| 2021-04-17 | MDISA Team Race Qualifier | skipper | 1.71 | 2.72 | 8–2 | 7.1 | +1.01 | 0.5 | 40% |
| 2020-03-07 | Severn School (MDISA) Team Race | crew | 2.27 | 3.56 | 2–4 | 1.0 | +1.29 | 0.8 | 26% |
| 2019-10-26 | MDISA Team Qualifier | crew | 2.26 | 4.32 | 4–1 | 3.2 | +2.06 | 0.8 | 39% |
| 2019-10-05 | MDISA Team Race Series 2 | crew | 2.21 | 3.13 | 8–2 | 7.0 | +0.93 | 0.5 | 35% |
| 2019-09-15 | MDISA Team Race 1 | crew | 2.16 | 2.84 | 6–3 | 5.5 | +0.68 | 0.2 | 52% |
| 2019-05-25 | NIT (Founders Trophy) | skipper | 1.80 | -1.39 | 1–4 | 3.4 | −3.19 | 4.2 | >99% |
| 2019-04-27 | MASSA Team Race Championship (Baker Qualifier) | crew | 2.13 | 1.09 | 6–15 | 8.3 | −1.04 | 1.3 | 95% |
| 2019-04-06 | MDISA Team Race Qualifier | crew | 2.11 | 3.42 | 7–3 | 5.8 | +1.32 | 0.9 | 27% |
| 2019-03-17 | MDISA Team Race | crew | 2.06 | 4.28 | 8–2 | 5.9 | +2.22 | 2.4 | 9% |
| 2018-11-03 | 2018 MASSA Fall Team Race Championship | crew | 1.84 | 2.23 | 5–1 | 4.7 | +0.39 | 0.1 | 63% |
| 2018-10-27 | 2018 MDISA Fall Team Race Championship | crew | 1.77 | 2.90 | 10–3 | 8.1 | +1.12 | 1.1 | 19% |
| 2018-09-29 | Severn School Team Race | crew | 1.68 | 0.95 | 2–4 | 2.6 | −0.73 | 0.2 | 86% |
| 2018-04-21 | MDISA Team Race League Championship | crew | 1.61 | -1.39 | 0–7 | 3.3 | ≤−3.00 | 7.0 | >99% |
| 2018-03-18 | DC Sail TR | crew | 0.94 | 2.63 | 8–2 | 5.8 | +1.69 | 1.9 | 11% |
| League | Name | School | Year |
|---|---|---|---|
| ICSA | Liam Gronda |  Connecticut College |
'25 |
| ISSA | Liam Gronda |  Walt Whitman High School |
'21 |
Short write-ups of what the ratings and results show, with the numbers and how they were computed.
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