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Player:  Jan Kooistra  Age: 79
KNDB-rating on 1-7-2023: 730
Highest KNDB-rating ever: 954
Average KNDB-rating all time: 818 
Virtual KNDB-rating : 710 Toernooibase Dammen

Strongest win in last 10 years by
Jan Kooistra (822):
09-12-2014 Erris van Egdom (1001)
(Provincial Teamcompetition Utrecht)
Toernooibase Dammen Weakest loss in last 10 years by
Jan Kooistra (813):
01-11-2016 Anton van Ginkel (648)
(Provincial Clubcompetition Utrecht)		     
DateTournamentOpponentRatGaPtR.diff.N.percN.pts
th 28-09-2023  Open Championship DC Hilversum  Jan van de Veen  1139 1-0-409 0.08 0.15
th 05-10-2023  Provincial Teamcompetition Utrecht  Peter van der Zwaag  620 1-2110 0.65 1.3
th 02-11-2023  Open Championship DC Hilversum  Bert Roest  993 1-1-263 0.18 0.36
th 09-11-2023  Provincial Teamcompetition Utrecht  Jeffrey Verwoerd  927 1-0-197 0.25 0.49
th 07-12-2023  Provincial Teamcompetition Utrecht  Evert Muis  813 1-0-83 0.39 0.77
th 14-12-2023  Open Championship DC Hilversum  Jude Kasangaki  901 1-0-171 0.27 0.55
th 11-01-2024  Open Championship DC Hilversum  Jasmina Benhari  719 1-011 0.52 1.03
th 07-03-2024  Open Championship DC Hilversum  Evert Muis  813 1-1-83 0.39 0.77
th 04-04-2024  Open Championship DC Hilversum  Ruud de Koning  661 1-069 0.6 1.19
 Total:9-46.61
 Correctionfactor:7.5 (118 g.)
 Calculation:4-6.61 x7.5=-19.61
 Virtual rating: 710
 Aver.rating: 843 Perc.:0.22Diff.: -218
 TPR: