ICSA Match Race National Championship

# SchoolTeam A TOT
1 Brown University Brown University Bears 1 1
2 U. S. Coast Guard Academy U. S. Coast Guard Academy Bears 2 2
3 Yale University Yale University Bulldogs 3 3
4 Georgetown University Georgetown University Hoyas 4 4
5 Stanford University Stanford University Cardinal 5 5
6 College of Charleston College of Charleston Cougars 6 6
7 Jacksonville University Jacksonville University Fins 7 7
8 U. S. Naval Academy U. S. Naval Academy Midshipmen 8 8
9 Tulane University Tulane University Green Wave 9 9
10 University of Chicago University of Chicago Maroons 10 10
SchoolTeam R1 TOT
Brown University Brown University Bears 1 1
U. S. Coast Guard Academy U. S. Coast Guard Academy Bears 2 2
Yale University Yale University Bulldogs 3 3
Georgetown University Georgetown University Hoyas 4 4
Stanford University Stanford University Cardinal 5 5
College of Charleston College of Charleston Cougars 6 6
Jacksonville University Jacksonville University Fins 7 7
U. S. Naval Academy U. S. Naval Academy Midshipmen 8 8
Tulane University Tulane University Green Wave 9 9
University of Chicago University of Chicago Maroons 10 10

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 keelboat rating rather than the fleet rating: 0.41 × the skipper's fleet rating from the week before the event (unrated skippers start at 0.47); 0.28 × the mean fleet rating of the rated crew aboard; the skipper's own keelboat offset; the school's program effect. Non-finishes (OCS, DNF and similar) are left out of the fitting, as in the rating model.

Percentile places a rating among the 207 ICSA sailors with a keelboat 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 keelboat 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.

  • — in the performance column: last in every race sailed, so no finite least-surprisal rating exists.

Division A  10 boats · 1 races

FinSkipperSchool Races Rating
before
Perf.
rating
Δ Percentile
before → perf.
Surprise
(bits)
P(this good
or better)
Avg finish
actual / exp.
1Liam O'Keefe '26Brown University1/13.237.00++3.7799th → 99th2.714%1.0 / 4.7
2Daniel Unangst '24U. S. Coast Guard Academy1/13.175.01+1.8399th → 99th1.124%2.0 / 4.8
3Morgan Pinckney '27Yale University1/13.024.24+1.2399th → 99th0.633%3.0 / 5.0
4Jeffrey Petersen '25Georgetown University1/12.663.79+1.1299th → 99th0.636%4.0 / 5.6
5Thomas Sitzmann '27Stanford University1/13.013.36+0.3599th → 99th0.156%5.0 / 5.1
6Axel Stordahl '24College of Charleston1/12.753.06+0.3199th → 99th0.159%6.0 / 5.5
7Matthew King '24Jacksonville University1/11.942.84+0.9198th → 99th0.449%7.0 / 6.9
8Nathan Smith '26U. S. Naval Academy1/13.672.02−1.6599th → 99th2.395%8.0 / 3.9
9Hamilton Barclay '27Tulane University1/12.851.49−1.3699th → 90th1.194%9.0 / 5.3
10Max Zhalilo '26University of Chicago1/11.19——81st → —0.6>99%10.0 / 8.0

Conditions — 11/03/2023 (8am–6pm)

☀️Clear sky
Humidity 56%  ·  Pressure 1028.5 hPa

Temperature

59°F
↑ 67°F   ↓ 45°F
Feels like 54°F

Wind

● from   ▲ toward
7.0 kn
avg  ·  max 9.0 kn
Gusts to 15.7 kn
From NNE (32°)

Sky & Precipitation

Cloud cover28% Sunshine10.0 hrs Humidity56% Pressure1028.5 hPa

What this breeze does at Charleston — from fleet racing

Breeze: NE about 9 kn (weather reanalysis in the scorer’s units)
In fleet races at Charleston in this breeze: an underdogs’ day (−0.03)
Underdogs’ conditions: in fleet racing here the fleet bunches up and lower-rated boats beat the seeds more often than usual.

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 ±0.03 means a rating gap counts about 2% less 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 Charleston by wind direction (angle) and speed (rings), fitted surface; dots are labelled regatta-days, ★ this regatta (69 labelled fleet-race days at Charleston).

From the notes

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

All notes →