Riley Cup — Analysis

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Performance rating answers one question for each skipper: holding every other skipper's rating fixed, which rating makes my actual race-by-race finishes least surprising? It is the maximum-likelihood rating under the same Plackett–Luce model that produces the power rankings (how accurate it is), with each opponent fixed at their rating from the last rated week before this event (2026-W37). Substitute skippers are scored only on the races they sailed, and races the boat did not finish (OCS, DNF and similar) are left out.

Percentile places a rating among the 1,907 ICSA skippers who were rated within the year before this event, so it reads as “better than X% of the skippers racing in this league right now”. The arrow shows where the sailor stood going in and where this performance would put them.

Surprise is how many bits more surprising the sailor's finishes were at their pre-event rating than at their performance rating (0 = exactly as expected). P(this good or better) simulates the regatta 3,000 times with the sailor at their pre-event rating against the actual fleet, and reports how often they would score this many points or fewer in the races they skippered. Races in one regatta are not independent, so each simulation also gives every skipper a good or bad regatta, form that drifts from race to race, and the speed of each boat the rotation puts them in (why). Low means an unusually good regatta, high means an unusually poor one. It deliberately ignores how rivals actually sailed, so it agrees with the performance rating rather than with the division finish, which also depends on everyone else's day. Ratings are shown on the rankings scale (model rating × 100). Only skippers are rated; crews are not part of the model.

  • n no rating before this event — the model's estimate from this week is used as the baseline.
  • — in the performance column means the skipper finished last in every race they sailed, so no finite least-surprisal rating exists.

Division A  18 boats · 5 races

Fin Skipper School Races Rating
before
Perf.
rating
Δ Percentile
before → perf.
Surprise
(bits)
P(this good
or better)
Avg finish
actual / exp.
Rating
after
1 Sean Trudell '28 U. S. Naval Academy Midshipmen 2 5/5 313 429 +116 92nd → 99th 2.6 5% 2.8 / 5.6 338
2 Pierce Olsen '29 Georgetown University Hoyas 1 5/5 394 366 -28 98th → 96th 0.2 56% 3.8 / 3.9 393
3 Leo Robillard '29 U. S. Naval Academy Midshipmen 1 5/5 309 372 +62 92nd → 96th 0.9 22% 4.0 / 5.6 318
4 Marina Conde '28 Old Dominion University Big Blue 5/5 291 347 +56 89th → 95th 0.7 22% 4.4 / 6.0 289
5 Davide Bazzoni '30 St. Mary's College of Maryland Seahawks 2 5/5 329 312 -17 93rd → 92nd 0.1 57% 5.2 / 5.1 326
6 Mason Cook '29 St. Mary's College of Maryland Seahawks 1 5/5 344 475 +131 95th → 99th 2.4 72% 5.6 / 4.8 378
7 Conrad Cook '29 Georgetown University Hoyas 2 5/5 266 240 -26 87th → 83rd 0.2 67% 7.4 / 6.7 264
8 Frank Wildi '29 George Washington University 4/5 66 246 +180 53rd → 84th 4.8 3% 7.0 / 11.9 88
8 Matthew Fremont-Smith '30 George Washington University 1/5 58n 155 +97 51st → 70th 0.5 40% 11.0 / 11.9 58
9 Gianna Dewey '27 Old Dominion University Monarchs 5/5 203 217 +13 78th → 80th 0.1 54% 8.4 / 8.3 205
10 James Lilyquist '28 Virginia Tech 5/5 208 113 -95 79th → 62nd 3.1 84% 10.2 / 8.2 203
11 Claire Sullivan '29 Penn State University 5/5 132 101 -31 65th → 60th 0.3 71% 11.4 / 10.3 130
12 Eli Leopold '28 University of Maryland 5/5 81 86 +4 56th → 57th 0.0 55% 11.8 / 11.6 82
13 Charlotte Stillman '27 William and Mary 5/5 78 91 +13 56th → 58th 0.0 60% 12.2 / 11.7 78
14 Berend Vandermeer '27 Christopher Newport University 5/5 28n 65 +37 46th → 53rd 0.3 52% 13.0 / 12.6 28
15 Arda Alpan '29 University of Virginia 5/5 6 -80 -86 41st → 25th 2.0 71% 14.6 / 13.2 -9
16 Seton Dill '27 University of Delaware 5/5 -112 -51 +61 18th → 30th 0.7 43% 15.4 / 15.5 -114
17 James Cottage '27 American University 5/5 -11 -130 -118 38th → 15th 3.5 96% 16.4 / 13.7 -16
18 Jackson Manley '27 Hampton University 5/5 -182 -156 +26 7th → 10th 0.1 54% 16.8 / 16.4 -177

Division B  18 boats · 5 races

Fin Skipper School Races Rating
before
Perf.
rating
Δ Percentile
before → perf.
Surprise
(bits)
P(this good
or better)
Avg finish
actual / exp.
Rating
after
1 Alex Baker '30 Georgetown University Hoyas 2 5/5 362 459 +97 96th → 99th 1.6 11% 2.0 / 3.7 360
2 Colin Krebs '30 St. Mary's College of Maryland Seahawks 2 5/5 277n 399 +122 88th → 98th 2.9 18% 2.8 / 5.8 277
3 Fynn Olsen '29 Georgetown University Hoyas 1 5/5 346 338 -8 95th → 94th 0.0 48% 3.6 / 4.2 345
4 Rhett Krawitt '30 George Washington University 5/5 206 267 +61 78th → 87th 0.9 17% 5.0 / 7.2 215
5 Scott Opert '28 St. Mary's College of Maryland Seahawks 1 5/5 238 217 -22 83rd → 80th 0.1 47% 6.0 / 6.4 239
5 Stone Dewey '30 Old Dominion University Monarchs 5/5 230 247 +17 82nd → 84th 0.1 42% 6.0 / 6.6 232
7 Henry Scalise '30 U. S. Naval Academy Midshipmen 1 5/5 154 213 +59 69th → 79th 0.8 18% 6.4 / 8.6 161
8 Jules Buczkowski '30 U. S. Naval Academy Midshipmen 2 5/5 253 232 -21 85th → 82nd 0.1 65% 6.6 / 6.1 252
9 Charlie Bates '30 Penn State University 5/5 72 113 +41 54th → 62nd 0.5 42% 10.4 / 10.9 74
9 Ivet Bejar '29 Hampton University 5/5 73 121 +48 54th → 63rd 0.6 42% 10.4 / 10.9 79
11 Tucker Mcgrady '30 Virginia Tech 5/5 161 73 -88 71st → 54th 2.3 85% 10.6 / 8.4 157
12 Jonah Willoughby '27 Old Dominion University Big Blue 5/5 128 30 -98 65th → 46th 3.0 80% 11.6 / 9.4 121
13 Brooke Lorson '27 American University 3/5 35 25 -10 47th → 45th 0.0 58% 12.3 / 11.8 32
13 Mitchell Janes '26 American University 2/5 28n 40 +12 46th → 48th 0.0 69% 14.0 / 11.6 28
14 James Unger '27 University of Virginia 5/5 -14 -39 -25 37th → 33rd 0.2 74% 14.2 / 13.0 -15
15 Jonathan Matney '27 Christopher Newport University 4/5 -78n -59 +18 25th → 29th 0.1 55% 14.8 / 13.9 -78
15 Griffin Donahoe '28 Christopher Newport University 1/5 86 25 -61 57th → 45th 0.3 71% 13.0 / 10.6 98
16 Colin Cartwright '29 William and Mary 4/5 -9 -16 -7 38th → 37th 0.0 66% 14.0 / 12.8 2
16 Tyler Boissevain '28 William and Mary 1/5 -137 — — 13th → — 2.7 >99% 18.0 / 15.3 -139
17 Caroline Fuller '28 University of Maryland 5/5 -135 -109 +26 13th → 19th 0.1 61% 16.0 / 15.2 -132
18 Kylie Mccabe '28 University of Delaware 5/5 -228 -233 -5 2nd → 2nd 0.0 67% 17.2 / 16.5 -228