SEISA Singlehand Open Championship

Performance rating asks, for each skipper: holding every other boat fixed, which rating makes my actual race-by-race finishes least surprising? Boats are valued with the singlehanded rating rather than the fleet rating: 0.79 × the skipper's fleet rating from the week before the event (unrated skippers start at 1.11); the skipper's own singlehanded offset. Strength differences are scaled by 0.80 before they become probabilities, the value that calibrates the model on seasons it had not seen. Non-finishes (OCS, DNF and similar) are left out of the fitting, as in the rating model.

Percentile places a rating among the 309 ICSA sailors with a singlehanded rating who raced the discipline in the last three seasons. Surprise is how many bits more surprising the finishes were at the pre-event rating than at the performance rating. P(this good or better) simulates the event 3,000 times at the pre-event ratings, with the same regatta-form model as the fleet analysis pages, and reports how often the skipper would score this many points or fewer in the races they sailed.

The singlehanded offsets are the current ones (the discipline files keep no weekly history), so a skipper's own offset has already seen this event; offsets are shrunk hard, so the effect is a few hundredths at most. Only skippers are rated.

  • u no fleet rating — the model's level for unrated skippers is the baseline.
  • — in the performance column: last in every race sailed, so no finite least-surprisal rating exists.

Division A  6 boats · 3 races

FinSkipperSchool Races Rating
before
Perf.
rating
Δ Percentile
before → perf.
Surprise
(bits)
P(this good
or better)
Avg finish
actual / exp.
1Hamilton Barclay '27Tulane University Green Wave 23/34.155.19+1.0597th → 99th0.435%1.3 / 1.8
2Thad Lettsome '24Tulane University Green Wave 13/33.754.25+0.5093rd → 98th0.140%1.7 / 2.1
3Lucas Tenrreiro '27University of Texas Longhorns 33/31.242.08+0.8429th → 54th0.538%3.3 / 3.9
4Zachary Aronson '27Texas A&M University at Galveston3/30.161.37+1.209th → 33rd1.129%4.0 / 4.6
5Oliver Fenner '26University of Texas Longhorns 13/30.570.70+0.1415th → 17th0.066%4.7 / 4.4
6Rahul Shah '26University of Texas Longhorns 23/30.74u——17th → —7.2>99%6.0 / 4.2

Conditions — 09/16/2023 (8am–6pm)

🌤️Partly cloudy
Humidity 84%  ·  Pressure 1016.6 hPa

Temperature

77°F
↑ 83°F   ↓ 72°F
Feels like 85°F

Wind

● from   ▲ toward
3.4 kn
avg  ·  max 5.5 kn
Gusts to 10.9 kn
From ENE (56°)

Sky & Precipitation

Cloud cover73% Sunshine6.7 hrs Humidity84% Pressure1016.6 hPa Rain0.54 in

What this breeze does at Texas — from fleet racing

Breeze: NE about 6 kn (weather reanalysis in the scorer’s units)
In fleet races at Texas in this breeze: a favourites’ day (+0.08)
Favourites’ conditions: in fleet racing here the results follow the ratings more closely than usual, and the top seeds hold their places.

Orderliness is how tightly a fleet race’s finishing order follows the pre-regatta ratings, relative to a typical event (0): positive is the favourites’ day, negative the underdogs’. A value of ±0.08 means a rating gap counts about 7% more than on a typical day. This event is not a fleet race the rating model scores, so there is no actual value for it: this is what this venue’s fleet racing history says about the breeze on the day, read off the chart at the star. How this is estimated · compare venues.

Orderliness beyond the fleet at Texas by wind direction (angle) and speed (rings), fitted surface; dots are labelled regatta-days, ★ this regatta (19 labelled fleet-race days at Texas).

From the notes

Short write-ups of what the ratings and results show, with the numbers and how they were computed.

All notes →