KP Dinghy Open Invite — 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 1,767 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.

Division A  9 boats · 8 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 Jacob Zils '27 Fordham University 7/8 355 446 +90 96th99th 2.0 59% 3.4 / 3.4 364
1 Michael Burns '29 Fordham University 1/8 126 700+ +574 64th99th 5.0 3% 1.0 / 6.5 130
2 Logan Mraz '29 Princeton University 8/8 282 314 +32 89th92nd 0.4 93% 6.0 / 4.5 287
3 Jackson Mcaliley '27 University of Pennsylvania Quakers 1 8/8 386 302 -84 98th91st 3.3 >99% 6.9 / 2.9 382
4 Adam Starck '29 SUNY Maritime College 8/8 209 278 +70 78th88th 1.5 98% 7.6 / 5.7 218
5 Drew D’Orsi '28 University of Pennsylvania Quakers 2 8/8 201n 247 +46 77th84th 0.7 95% 8.4 / 5.7 201
6 Jj Klempen '27 Hobart and William Smith Colleges 8/8 319 248 -71 93rd84th 2.3 >99% 8.8 / 3.9 316
7 Langdon Wallace '27 U. S. Merchant Marine Academy 8/8 200 246 +45 77th84th 0.7 >99% 9.2 / 5.7 215
8 Nikhil Damji '29 Cornell University 8/8 130 127 -3 65th64th 0.0 >99% 12.2 / 6.8 129
9 Gavin Galway '30 Webb Institute 8/8 169 129 -40 72nd65th 0.6 >99% 13.5 / 6.1 157

Division B  9 boats · 8 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 Chris Small '30 University of Pennsylvania Quakers 2 8/8 332 365 +34 94th96th 0.3 98% 4.6 / 2.8 336
2 Ian Lent '28 University of Pennsylvania Quakers 1 8/8 312 292 -20 92nd90th 0.1 >99% 5.9 / 3.1 311
3 Patrick Shachoy '28 Fordham University 7/8 284 331 +47 89th94th 0.6 97% 5.3 / 3.5 289
3 Luke Ondrey '29 Fordham University 1/8 148 253 +105 68th85th 0.5 >99% 11.0 / 5.2 150
4 James Kopack '28 Hobart and William Smith Colleges 8/8 275 258 -18 88th86th 0.1 >99% 8.6 / 3.6 273
5 Leopold Faerber '29 Cornell University 8/8 163 195 +32 71st77th 0.4 >99% 10.9 / 5.2 168
6 Sebastien Nordenson '27 Princeton University 8/8 41 136 +95 48th66th 2.6 >99% 13.2 / 6.8 54
7 Luke Barker '28 SUNY Maritime College 4/8 109 132 +23 61st65th 0.1 >99% 13.0 / 5.9 111
7 Nathaniel Hartwell '28 SUNY Maritime College 4/8 162 22 -140 71st44th 3.6 >99% 15.0 / 5.3 158
8 Oscar Gilroy '27 U. S. Merchant Marine Academy 8/8 44 -20 -64 48th37th 1.2 >99% 15.5 / 6.9 33
9 Jack Prior '27 Webb Institute 8/8 8 -7 -15 42nd39th 0.1 >99% 16.5 / 7.2 7