High School National Keelboat Invitational

# SchoolTeam A TOT
1 Mater Dei High School Mater Dei High School Monarchs 27 27
2 Lake Forest High School Lake Forest High School Scouts 40 40
3 Lake Travis High School Lake Travis High School Cavaliers 41 41
4 Lucy Beckham High School Lucy Beckham High School Bengals 48 48
5 St. George's School St. George's School Dragons 48 48
6 Corona del Mar High School Corona del Mar High School Sea Kings 56 56
7 Key School Key School Zags 66 66
8 Severn School Severn School Admirals 66 66
9 Olympia High School Olympia High School Bears 79 79
10 Barrington High School Barrington High School Eagles 79 79
SchoolTeam R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 TOT
Mater Dei High School Mater Dei High School Monarchs 2 4 5 3 1 2 2 3 2 3 27
Lake Forest High School Lake Forest High School Scouts 4 6 10 8 3 1 5 1 1 1 40
Lake Travis High School Lake Travis High School Cavaliers 1 5 1 4 8 7 1 6 6 2 41
Lucy Beckham High School Lucy Beckham High School Bengals 5 3 4 2 2 5 7 5 8 7 48
St. George's School St. George's School Dragons 6 2 7 5 4 3 8 2 7 4 48
Corona del Mar High School Corona del Mar High School Sea Kings 9 1 2 6 5 8 6 9 4 6 56
Key School Key School Zags 3 8 6 9 6 9 9 8 3 5 66
Severn School Severn School Admirals 7 7 9 7 7 4 3 4 9 9 66
Olympia High School Olympia High School Bears 8 9 3 10 9 6 4 10 10 10 79
Barrington High School Barrington High School Eagles 10 10 8 1 10 10 10 7 5 8 79

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 78 ISSA 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.

Division A  10 boats · 10 races

FinSkipperSchool Races Rating
before
Perf.
rating
Δ Percentile
before → perf.
Surprise
(bits)
P(this good
or better)
Avg finish
actual / exp.
1Noah Stapleton '25Mater Dei High School10/102.443.65+1.2199th → 99th5.76%2.7 / 4.8
2Charlie Gish '24Lake Forest High School10/102.082.60+0.5299th → 99th1.117%4.0 / 5.5
3James Brock '24Lake Travis High School10/102.082.75+0.6799th → 99th2.118%4.1 / 5.5
4James Pine '26Lucy Beckham High School10/102.502.54+0.0599th → 99th0.052%4.8 / 4.8
4Pearse Dowd '25St. George's School10/102.402.58+0.1899th → 99th0.250%4.8 / 4.9
6Dylan Sih '24Corona del Mar High School10/102.652.02−0.6399th → 99th2.379%5.6 / 4.5
7Mason Cook '25Key School10/101.991.82−0.1799th → 99th0.274%6.6 / 5.6
7Will Friedell '24Severn School10/102.121.79−0.3299th → 99th0.679%6.6 / 5.4
9Christopher Chwalk '24Barrington High School10/101.700.71−0.9999th → 55th3.889%7.9 / 6.2
9Liam Power '25Olympia High School10/100.851.05+0.1968th → 74th0.155%7.9 / 7.6

Conditions — 12/09/2023 (8am–6pm)

☀️Clear sky
Humidity 72%  ·  Pressure 1020.9 hPa

Temperature

74°F
↑ 79°F   ↓ 66°F
Feels like 75°F

Wind

● from   ▲ toward
8.0 kn
avg  ·  max 8.9 kn
Gusts to 17.9 kn
From SSE (156°)

Sky & Precipitation

Cloud cover40% Sunshine9.8 hrs Humidity72% Pressure1020.9 hPa

What this breeze does at St. Petersburg — from fleet racing

Breeze: SE about 10 kn (weather reanalysis in the scorer’s units)
In fleet races at St. Petersburg in this breeze: a favourites’ day (+0.05)
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 ±0.05 means a rating gap counts about 4% 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 St. Petersburg by wind direction (angle) and speed (rings), fitted surface; dots are labelled regatta-days, ★ this regatta (only 5 labelled days at St. Petersburg, so the surface is mostly the all-venue pattern).

From the notes

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

All notes →