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Player:  Sjoerd Koopman  Age: 68
KNDB-rating on 1-7-2023: 1263
Highest KNDB-rating ever: 1338
Average KNDB-rating all time: 1286 
Virtual KNDB-rating : 1248 Toernooibase Dammen

Strongest win in last 10 years by
Sjoerd Koopman (1256):
23-11-2019 Frits Zegelink (1223)
(Dutch Teamcompetition KNDB)
Toernooibase Dammen Weakest loss in last 10 years by
Sjoerd Koopman (1291):
21-02-2015 Henk Jonker (1058)
(Dutch Teamcompetition KNDB)

FMJD-rating: 2152
Highest FMJD-rating ever: 2239
Average FMJD-rating all time: 2190
(Graphics FMJD-rating in period
KNDB-rating)

 Highest Historical
Toernooibaserating on 01-01-1988:  1303 D
     
DateTournamentOpponentRatGaPtR.diff.N.percN.pts
sa 09-09-2023  Dutch Teamcompetition KNDB  Dirk Sinnema  1086 1-1177 0.73 1.46
sa 23-09-2023  Dutch Teamcompetition KNDB  Raphaël Zdoroviak  1145 1-2118 0.66 1.32
sa 14-10-2023  Dutch Teamcompetition KNDB  Wim Dekker  1113 1-2150 0.7 1.4
sa 18-11-2023  Dutch Teamcompetition KNDB  Jouke de Haan  1065 1-1198 0.76 1.51
sa 02-12-2023  Dutch Teamcompetition KNDB  Klaas Veldstra  1031 1-2232 0.79 1.58
sa 06-01-2024  Dutch Teamcompetition KNDB  Henk van Renselaar  978 1-2285 0.84 1.68
we 17-01-2024  Frisian championship seniors DCH Heerenveen - Mildam  Geert Rozenberg  860 1-2403 0.92 1.84
sa 20-01-2024  Dutch Teamcompetition KNDB  Ricardo Tong Sang  1077 1-1186 0.74 1.48
we 24-01-2024  Frisian championship seniors DCH Heerenveen - Mildam  Jouke de Haan  1065 1-2198 0.76 1.51
we 31-01-2024  Frisian championship seniors DCH Heerenveen - Mildam  Aize Plantinga  1076 1-1187 0.74 1.49
sa 03-02-2024  Dutch Teamcompetition KNDB  Anton Jurg  1182 1-181 0.61 1.22
we 07-02-2024  Frisian championship seniors DCH Heerenveen - Mildam  Sipke Doller  1158 1-1105 0.64 1.29
we 14-02-2024  Frisian championship seniors DCH Heerenveen - Mildam  Iepie Poepjes-Koopman  947 1-1316 0.87 1.73
sa 17-02-2024  Dutch Teamcompetition KNDB  Fred van Amersfoort  1008 1-1255 0.81 1.63
we 21-02-2024  Frisian championship seniors DCH Heerenveen - Mildam  Jan de Vos  989 1-1274 0.83 1.66
we 28-02-2024  Frisian championship seniors DCH Heerenveen - Mildam  Anton Schotanus  1256 1-07 0.51 1.02
sa 02-03-2024  Dutch Teamcompetition KNDB  Leo Peters  1013 1-1250 0.81 1.62
we 06-03-2024  Frisian championship seniors DCH Heerenveen - Mildam  Wim van der Molen  1086 1-2177 0.73 1.46
 Total:18-2426.92
 Correctionfactor:5 (458 g.)
 Calculation:24-26.92 x5=-14.60
 Virtual rating: 1248
 Aver.rating: 1063 Perc.:0.67Diff.: 123
 TPR: 1063 +123 1186