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Player:  Jan Hiemstra  Age: 68
KNDB-rating on 1-7-2023: 617
Highest KNDB-rating ever: 639
Average KNDB-rating all time: 607 
Virtual KNDB-rating : 628 Toernooibase Dammen

Strongest win in last 10 years by
Jan Hiemstra (583):
23-06-2015 Martin Boersbroek (997)
(Summertournament Friesland)
Toernooibase Dammen Weakest loss in last 10 years by
Jan Hiemstra (606):
15-05-2018 Hielke Luik (455)
(Summertournament Friesland)		     
DateTournamentOpponentRatGaPtR.diff.N.percN.pts
mo 08-05-2023  Summertournament Friesland  Tabe de Vries  844 1-1-227 0.21 0.43
tu 16-05-2023  Summertournament Friesland  Gerard Weinans  712 1-2-95 0.37 0.74
mo 22-05-2023  Summertournament Friesland  Jan Sloot  681 1-2-64 0.41 0.82
tu 30-05-2023  Summertournament Friesland  Piet Wiersma  859 1-0-242 0.2 0.4
mo 05-06-2023  Summertournament Friesland  Wim Riddersma  877 1-1-260 0.18 0.36
tu 13-06-2023  Summertournament Friesland  Johan Tuenter  944 1-0-327 0.13 0.25
mo 19-06-2023  Summertournament Friesland  Wijtze van der Meulen  735 1-1-118 0.34 0.68
tu 27-06-2023  Summertournament Friesland  Sjouke Zijlstra  773 1-0-156 0.29 0.59
mo 10-07-2023  Summertournament Friesland  Geert Rozenberg  860 1-0-243 0.2 0.4
tu 18-07-2023  Summertournament Friesland  Willem Lep  816 1-0-199 0.24 0.49
mo 24-07-2023  Summertournament Friesland  Klaas Mondria  821 1-0-204 0.24 0.48
tu 01-08-2023  Summertournament Friesland  Fokke Smid  923 1-0-306 0.14 0.28
mo 07-08-2023  Summertournament Friesland  Harm Terpstra  966 1-0-349 0.11 0.22
sa 04-11-2023  Dutch Teamcompetition KNDB  Hiltjo Haze  798 1-2-181 0.26 0.53
sa 02-03-2024  Dutch Teamcompetition KNDB  Durk de Vries  1058 1-0-441 0.06 0.12
 Total:15-96.78
 Correctionfactor:5 (218 g.)
 Calculation:9-6.78 x5=11.11
 Virtual rating: 628
 Aver.rating: 844 Perc.:0.3Diff.: -150
 TPR: 844 +-150 694