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Player:  Piet Wiersma  Age: 53
KNDB-rating on 1-7-2023: 859
Highest KNDB-rating ever: 867
Average KNDB-rating all time: 828 
Virtual KNDB-rating : 861 Toernooibase Dammen

Strongest win in last 10 years by
Piet Wiersma (793):
26-05-2014 Reinout Sloot (1128)
(Summertournament Friesland)
Toernooibase Dammen Weakest loss in last 10 years by
Piet Wiersma (850):
07-11-2016 Miep Rops (609)
(Provincial Teamcompetition Friesland)		     
DateTournamentOpponentRatGaPtR.diff.N.percN.pts
tu 02-05-2023  Summertournament Friesland  Tabe de Vries  844 1-115 0.52 1.04
mo 08-05-2023  Summertournament Friesland  Sjouke Zijlstra  773 1-286 0.62 1.24
tu 16-05-2023  Summertournament Friesland  Siep Altena  950 1-2-91 0.38 0.75
mo 22-05-2023  Summertournament Friesland  Joop de Graaf  796 1-263 0.59 1.17
tu 30-05-2023  Summertournament Friesland  Jan Hiemstra  617 1-2242 0.8 1.6
mo 05-06-2023  Summertournament Friesland  Johan Tuenter  944 1-1-85 0.38 0.77
tu 13-06-2023  Summertournament Friesland  Jan Starke  871 1-0-12 0.48 0.97
mo 19-06-2023  Summertournament Friesland  Willem Lep  816 1-243 0.56 1.12
tu 27-06-2023  Summertournament Friesland  Wijtze van der Meulen  735 1-2124 0.67 1.34
mo 10-07-2023  Summertournament Friesland  Karel de Bruin  928 1-0-69 0.4 0.81
tu 18-07-2023  Summertournament Friesland  Klaas Mondria  821 1-038 0.55 1.11
mo 24-07-2023  Summertournament Friesland  Gerard Weinans  712 1-1147 0.7 1.39
tu 01-08-2023  Summertournament Friesland  Geert Rozenberg  860 1-0-1 0.5 1
tu 07-11-2023  Provincial Teamcompetition Friesland  Oscar Veltman  1144 1-0-285 0.16 0.32
mo 29-01-2024  Provincial Teamcompetition Friesland  Eeltje Terpstra  907 1-1-48 0.43 0.87
we 21-02-2024  Provincial Teamcompetition Friesland  Peter Boonstra  1214 1-0-355 0.11 0.21
 Total:16-1615.7
 Correctionfactor:5 (195 g.)
 Calculation:16-15.7 x5=1.50
 Virtual rating: 861
 Aver.rating: 871 Perc.:0.5Diff.: 0
 TPR: 871 +0 871