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Player:  Sietse Jonker  Age: 62 KNDB-rating on 1-7-2023: 897 Highest KNDB-rating ever: 967 Average KNDB-rating all time: 908  Virtual KNDB-rating : 884 Strongest win in last 10 years by Sietse Jonker (895): 18-10-2014 Bernard Post (1140) (Dutch Teamcompetition KNDB) Weakest loss in last 10 years by Sietse Jonker (915): 15-02-2023 Dirk Zwier (715) (Frisian Championship seniors DCH Heerenveen - Mildam)

Date	Tournament	Opponent	Rat	Ga		Pt	R.diff.	N.perc	N.pts
we 17-01-2024	Frisian championship seniors DCH Heerenveen - Mildam	Wim Riddersma	877	1	-	0	20	0.53	1.06
we 24-01-2024	Frisian championship seniors DCH Heerenveen - Mildam	Yke Miedema	767	1	-	2	130	0.68	1.35
we 31-01-2024	Frisian championship seniors DCH Heerenveen - Mildam	Martin Boersbroek	994	1	-	1	-97	0.37	0.73
we 07-02-2024	Frisian championship seniors DCH Heerenveen - Mildam	Marcel Zwiers	724	1	-	0	173	0.73	1.46
we 14-02-2024	Frisian championship seniors DCH Heerenveen - Mildam	Wypke Rusticus	689	1	-	2	208	0.77	1.53
we 21-02-2024	Frisian championship seniors DCH Heerenveen - Mildam	Gerrit Terpstra	1077	1	-	0	-180	0.26	0.53
we 28-02-2024	Frisian championship seniors DCH Heerenveen - Mildam	Sjouke Zijlstra	773	1	-	1	124	0.67	1.34
we 06-03-2024	Frisian championship seniors DCH Heerenveen - Mildam	Ton Bouwkamp	646	1	-	1	251	0.81	1.62
		Total:		8	-	7			9.61
		Correctionfactor:		5	(396 g.)
		Calculation:		7	-	9.61 x		5=	-13.07
		Virtual rating:							884
		Aver.rating:	818	Perc.:			0.44	Diff.:	-45
		TPR: