Friso Grolleman

Rating History

Singlehanded & Keelboat Ratings

DisciplineRating Rank RacesLast raced
Singlehanded1.33unranked (fewer than 10 races or not active)31Fall 2019
Keelboat0.65unranked (fewer than 10 races or not active)2Fall 2019

Team Race Rating

Rating Rank vs fleet rating Record
0.97 (fleet 1.57) unranked (fewer than 30 matches as skipper, or not active) +0.00 ± 0.18
about what the fleet rating predicts
as skipper 60–52 (54%)
SeasonRegattas Skipper W–LCrew W–L
Spring 202012–4—
Fall 2019212–3—
Spring 2019425–26—
Fall 2018421–12—
Spring 201810–7—
0.911.11.2Fall 2018Spring 2019Fall 2019Spring 2020SSA Team Race (2018-09-23): rating 0.98, fleet rating alone 1.05, offset -0.07; record 4-4 in this boatSevern School Team Race (2018-09-29): rating 0.98, fleet rating alone 1.06, offset -0.08; record 2-4 in this boat2018 MDISA Fall Team Race Championship (2018-10-27): rating 0.99, fleet rating alone 1.08, offset -0.09; record 10-3 in this boat2018 MASSA Fall Team Race Championship (2018-11-03): rating 1.01, fleet rating alone 1.08, offset -0.07; record 5-1 in this boatMDISA Team Race (2019-03-17): rating 1.03, fleet rating alone 1.09, offset -0.06; record 8-2 in this boatSevern Spring TR 12 boats (2019-03-23): rating 1.05, fleet rating alone 1.09, offset -0.04; record 4-6 in this boatMDISA Team Race Qualifier (2019-04-06): rating 1.03, fleet rating alone 1.07, offset -0.05; record 7-3 in this boatMASSA Team Race Championship (Baker Qualifier) (2019-04-27): rating 1.00, fleet rating alone 1.04, offset -0.04; record 6-15 in this boatMDISA Team Race Series 2 (2019-10-05): rating 1.00, fleet rating alone 1.01, offset -0.01; record 8-2 in this boatMDISA Team Qualifier (2019-10-26): rating 1.01, fleet rating alone 1.01, offset -0.00; record 4-1 in this boatSevern School (MDISA) Team Race (2020-03-07): rating 1.00, fleet rating alone 1.00, offset +0.00; record 2-4 in this boatTeam race rating

Rating before each regatta driven (solid; dots green when the boat won 60% or more of its matches there, red under 40%) and what the fleet rating alone would give (dashed). The gap is the team race offset as it stood at the time. Hover a dot for the regatta; click to open it.

Team race surprisal: regatta by regatta

Over 12 graded regattas (112 matches) the record is 60–52 against 59.0 wins the pre-event forecasts expected (+1.0). 2 regattas clearly above the rating (P ≤ 20%), 4 clearly below (P ≥ 80%); 15 bits of surprise in all.

DateRegattaRole Value Perf. RecordExp.
wins
Δ Surprise
(bits)
P(this good
or better)
2020-03-07Severn School (MDISA) Team Raceskipper1.122.412–41.0+1.290.826%
2019-10-26MDISA Team Qualifierskipper1.373.444–13.2+2.060.839%
2019-10-05MDISA Team Race Series 2skipper1.242.168–27.0+0.930.535%
2019-04-27MASSA Team Race Championship (Baker Qualifier)skipper1.380.346–158.3−1.041.395%
2019-04-06MDISA Team Race Qualifierskipper1.332.657–35.8+1.320.927%
2019-03-23Severn Spring TR 12 boatsskipper1.180.524–64.7−0.660.386%
2019-03-17MDISA Team Raceskipper1.273.498–25.9+2.222.49%
2018-11-032018 MASSA Fall Team Race Championshipskipper1.241.635–14.7+0.390.163%
2018-10-272018 MDISA Fall Team Race Championshipskipper1.042.1610–38.1+1.121.119%
2018-09-29Severn School Team Raceskipper1.020.292–42.6−0.730.286%
2018-09-23SSA Team Raceskipper1.050.684–44.4−0.370.179%
2018-04-21MDISA Team Race League Championshipskipper1.15-1.850–73.3≤−3.007.0>99%

Regatta results

Regatta Role Div Races Avg Rating
Spring 2020 Team page Season
Severn School (MDISA) Team Race Skipper TR 8 50% —
Fall 2019 Team page Season
MDISA Team Race Series 2 Skipper TR 10 80% —
MDISA Team Qualifier Skipper TR 5 80% —
MDISA Season Opener Skipper A 4 9.2 -0.31
MDISA Keelboat Keelboat Skipper A 4 4.2 0.16
MASSA Fall Gold Fleet Championship Skipper A 6 14.7 -0.88
MASSA Cressy Qualifier Laser Singlehanded Skipper A 11 3.2 2.00
Maryland State Championship Skipper A 4 9.8 -0.01
ISSA Cressy National Championship - Full Singlehanded Skipper A 14 14.6 —
Spring 2019 Team page Season
SSPP Varsity Fleet Race Skipper B 4 3.8 1.66
Severn Spring TR 12 boats Skipper TR 10 40% —
MDISA Team Race Qualifier Skipper TR 10 70% —
MDISA Team Race Skipper TR 10 80% —
MDISA Spring Season Opener @ DCSail Skipper B 3 8.0 0.67
MDISA Spring Championship Skipper A 6 2.8 1.31
MDISA Fleet Qualifier Skipper B 10 6.4 1.06
MASSA Team Race Championship (Baker Qualifier) Skipper TR 21 29% —
MASSA 2019 Spring Gold Fleet Championship Skipper B 2 13.5 -0.66
DC Sail Fleet Race Skipper B 2 9.0 0.49
Christchurch Spring Intersectional Kick Off Skipper A 4 12.8 -0.14
Fall 2018 Team page Season
SSA Team Race Skipper TR 8 50% —
SSA Fall Fleet Race Skipper A 1 8.0 —
Severn School Team Race Skipper TR 6 33% —
MDISA Varsity Fleet Race Skipper A 1 7.0 —
MASSA Fall SILVER Fleet Champs Skipper B 2 11.0 0.28
MASSA Cressy Qualifier Full Rig Singlehanded Skipper A 6 4.7 —
BCSC MDISA Fall Championship Skipper A 2 8.5 0.57
2018 MDISA Fall Team Race Championship Skipper TR 8 88% —
2018 MASSA Fall Team Race Championship Skipper TR 6 83% —
Spring 2018 Team page Season
MDISA Team Race League Championship Skipper TR 7 0% —
MDISA Fleet Race Skipper A 8 8.9 0.56
MASSA Spring Silver Fleet Championship Skipper B 16 6.9 0.96
DC Sail Varsity Fleet Race Skipper B 2 6.0 -0.04

From the notes

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

All notes →

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