Chess South Africa Ratings Database

PLAYER PAGE

Personal

Jonker, J (Jaen-Pierre)

Chess SA id

107065190

FIDE id

Date of birth

2007-04-14 (U20)

Gender

Male

Region

Sedibeng (GSV)

Citizen

RSA

Titles

Chess SA registered

Yes

Last active game

2025-12-07

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1335.4	1321.2	942.8	764
Raw rating	1335.4	1321.2	942.8	764
Weighted rating	1307.4	1283.2	923.7	764
Weighted performance	1246.7	1251.2	0	0
Floor	858.6	857.7	500	500
K-factor	36	36	40	40
Min/Max rating change allowed	136.7	139.5	239.2	308.6
Highest rating	1383.4 2024-11-01	1357.7 2023-04-01	1200 2020-01-01	1200 2024-02-01
Highest raw rating	1358.6 2024-11-01	1357.7 2023-04-01	942.8 2024-11-01	764 2024-02-01
Highest weighted rating	1358.6 2023-05-01	1357.7 2023-05-01	942.8 2024-11-01	764 2024-11-01
Highest weighted performance	1383.4 2024-11-01	1317.9 2019-08-01	1200 2020-01-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1335.4	1321.2	942.8	764
Analysis
Rating	1335.4	1321.2	942.8	764
Raw rating	1335.4	1321.2	942.8	764
Weighted rating	1307.4	1283.2	923.7
Weighted performance	1246.7	1251.2	0
K-factor	36	36	40	40
Floor	858.6	857.7	500	500
Max/Min rating change allowed	136.7	139.5	239.2	308.6
Games	0	0	0	0
Score	0	0	0	0
Expected score	0	0	0	0
Score-Expected	0	0	0	0
Temp raw +/-	0	0	0	0
Final raw +/-	0	0	0	0
New raw rating	1335.4	1321.2	942.8	764
New weighted rating	1312.4	1288.2	927.9	764
New weighted performance	1238.1	1242.5	0	0
Temp new rating	1335.4	1321.2	942.8	764
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1335.4	1321.2	942.8	764
New K-factor	36	36	40	40
New floor	858.6	857.7	500	500

Item	Main	Standard	Rapid
	0	0	0
	9	9	0
	43	33	10
	40	31	9
	14	14	0
	0	0	0
History	397	378	19

Games since
	Main 52	Standard 42		Rapid 10		Blitz 0
Gender	Male
Age group	U20
Region	Sedibeng (GSV)
Province	Gauteng (GT)
Main
	RSA		Province		Region
Overall	2668		916		92
Male	2142		733		77
U20	204		62		5
U20 Male	160		46		5
Standard
	RSA		Province		Region
Overall	2804		1024		108
Male	2239		821		87
U20	216		70		5
U20 Male	165		52		4
Rapid
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U20	-1		-1		-1
U20 Male	-1		-1		-1
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U20	-1		-1		-1
U20 Male	-1		-1		-1


	Games	Score	%	Dp	AvgOpp	Performance
Main	0	0	0	0	0	0
Standard	0	0	0	0	0	0
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0

	Games	Score	%	Dp	AvgOpp	Performance
Main	9	5	55.56	47.2	1356.7	1403.9
Standard	9	5	55.56	47.2	1356.7	1403.9
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	242	133	54.96	42.1	1153.8	1196
Standard	223	126	56.5	55.3	1140.5	1195.8
Rapid	19	7	36.84	-111.8	1310.4	1198.5
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2026-01-01	1335.4	1321.2	942.8	764
2025-11-30	1354.4	1336.3	942.8	764
2025-11-01	1354.4	1336.3	942.8	764
2025-09-30	1354.4	1336.3	942.8	764
2025-09-01	1354.4	1336.3	942.8	764
2025-08-01	1303.2	1265.7	942.8	764
2025-07-01	1303.2	1265.7	942.8	764
2025-06-01	1303.2	1265.7	942.8	764
2025-05-01	1303.2	1265.7	942.8	764
2025-04-01	1303.2	1265.7	942.8	764
2025-03-01	1324.4	1286.8	942.8	764
2025-02-01	1324.4	1286.8	942.8	764
2025-01-01	1324.4	1286.8	942.8	764
2024-12-01	1330.8	1265.1	942.8	764
2024-11-01	1358.6	1265.8	942.8	764
2024-10-01	1194.3	1216.8	840.4	764
2024-09-01	1194.3	1216.8	840.4	764
2024-11-01	1164.1	1183.7	840.4	764
2024-07-01	1166.9	1185.5	787.6	764
2024-06-01	1166.9	1185.5	787.6	764
2024-05-01	1166.9	1185.5	787.6	764
2024-04-01	1166.9	1185.5	787.6	764
2024-03-01	1192.3	1223.7	787.6	764
2024-02-01	1192.3	1223.7	787.6	764

Comming soon.

Tournaments

History

No tournaments found.

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis

No tournaments found.

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Gauteng Inter-Region at Emerald Resort 2025 (U20)	2025-12-06	2025-12-07	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
2	GDE (D8) Sedibeng West Schools - Teams 2025 (U19)	2025-08-16	2025-08-16	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
3	Hoerskool Drie Riviere Open 08 March 2025 (A)	2025-03-08	2025-03-08	Standard	Sedibeng (GSV)	5	4	1	Yes	Analysis
4	Gauteng Inter-Region at UJ 2024 (U18 Open)	2024-12-07	2024-12-08	Standard	Johannesburg Metro (GJM)	5	5	1.5	Yes	Analysis
5	Queens Gambit Chess Open 2024 (A)	2024-11-23	2024-11-23	Standard	Sedibeng (GSV)	5	5	1.5	Yes	Analysis
6	Fonteine Open 2024 (A)	2024-10-19	2024-10-19	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
7	Gauteng Top Schools 2024 (U19 Open)	2024-10-05	2024-10-05	Rapid	Ekurhuleni (GE)	5	4	3	Yes	Analysis
8	Sedibeng West District Schools Chess Team's Championships 2024 (U19)	2024-08-12	2024-08-12	Standard	Sedibeng (GSV)	5	4	2.5	Yes	Analysis
9	Eureka Open 27 July 2024 (D)	2024-07-27	2024-07-27	Standard	Sedibeng (GSV)	5	5	2.5	Yes	Analysis
10	Midvaal Winter Classic 13 July 2024 (B)	2024-07-13	2024-07-13	Rapid	Sedibeng (GSV)	7	6	1.5	Yes	Analysis
11	Valia's Open 2024 (A)	2024-03-02	2024-03-02	Standard	Sedibeng (GSV)	5	4	0.5	Yes	Analysis
12	2024 Gauteng Inter-Region Chess Championship (U18A)	2024-01-13	2024-01-14	Standard	Tshwane (GTP)	5	5	0	Yes	Analysis
13	Dr Pieter Hangelbroek Rapid 2023 (A)	2023-10-28	2023-10-28	Rapid	Sedibeng (GSV)	5	5	1.5	Yes	Analysis
14	2023 Gauteng Top Schools (U17 Mixed)	2023-08-19	2023-08-19	Standard	West Rand (GWR)	5	5	2.5	Yes	Analysis
15	2023 Sedibeng West District Schools Chess Tournament (U17+U19)	2023-08-12	2023-08-12	Standard	Sedibeng (GSV)	5	4	2	Yes	Analysis
16	Overvaal Ope Jul 2023 (A)	2023-07-22	2023-07-22	Standard	Sedibeng (GSV)	5	4	1	Yes	Analysis
17	VaalPark Primary Open Chess 2023 (A)	2023-06-16	2023-06-16	Rapid	Sedibeng (GSV)	5	4	1	Yes	Analysis
18	D8 Schools Individuals 2023 (U18 Boys)	2023-05-20	2023-05-20	Standard	West Rand (GWR)	5	4	2	Yes	Analysis
19	Valia's Chess Tournament 2023 (A)	2023-05-06	2023-05-06	Standard	Sedibeng (GSV)	5	5	1.5	Yes	Analysis
20	Driehoek Open Chess Tournament 2023 (A)	2023-05-13	2023-05-13	Standard	Sedibeng (GSV)	5	4	1.5	Yes	Analysis
21	Hoerskool Drie Riviere Open 2023 (A)	2023-03-11	2023-03-11	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
22	2022 Gauteng Schools Team Championships (U17 Open)	2022-08-26	2022-08-26	Standard	Tshwane (GTP)	5	5	4	Yes	Analysis
23	Carel`s Chess Open 2022 (B)	2022-03-05	2022-03-05	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
24	Heidelberg Klub Open 2002 (A+B)	2022-02-19	2022-02-19	Standard	Sedibeng (GSV)	5	4	1	Yes	Analysis
25	Hoerskool Drie Riviere 2020 (A+B)	2020-03-07	2020-03-07	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
26	AG Visser 2020 (A+B)	2020-02-22	2020-02-22	Standard	Sedibeng (GSV)	5	5	2.5	Yes	Analysis
27	2019 South African Junior Team Championships (U14C)	2020-01-04	2020-01-08	Standard	4 Knights (4K)	7	7	5.5	Yes	Analysis
28	GE vs GSV Inter Regional 2019 (U14A)	2019-10-26	2019-10-26	Standard	Ekurhuleni (GE)	5	5	2.5	Yes	Analysis
29	Sedibeng Heritageday Open 2019 (A)	2019-09-24	2019-09-24	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
30	2019 Gauteng School League Finals (U13 Open)	2019-08-23	2019-08-23	Standard	Tshwane (GTP)	5	5	4	Yes	Analysis
31	LS Voorwaarts & Dr P Hangelbroek Chess Open 2019 (C)	2019-08-31	2019-08-31	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
32	TST-MSA Chess Open 2019 (C)	2019-07-20	2019-07-20	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
33	Overvaal Chess Open 2019 (C)	2019-06-15	2019-06-15	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
34	Drie Riviere Open 2019 (C)	2019-06-08	2019-06-08	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
35	Amigo Spur Eligwa Chess Open 2019 (C)	2019-05-18	2019-05-18	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
36	Dirk de Koster Chess Open 2019 (B)	2019-04-13	2019-04-13	Standard	Sedibeng (GSV)	5	5	1	Yes	Analysis
37	Carels Open 2019 (B)	2019-03-02	2019-03-02	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
38	Eagle`s Open 2018 (C)	2018-12-08	2018-12-08	Standard	Sedibeng (GSV)	5	5	3.5	Yes	Analysis
39	South African Junior Team Championships 2018 (U12C)	2018-12-16	2018-12-20	Standard	4 Knights (4K)	7	7	4.5	Yes	Analysis
40	2018 Interregion Sedibeng vs Ekurhuleni (D)	2018-11-03	2018-11-03	Standard	Sedibeng (GSV)	6	5	3	Yes	Analysis
41	2018 Sedibeng Summer Open (G)	2018-10-20	2018-10-20	Standard	Sedibeng (GSV)	5	5	4.5	Yes	Analysis
42	Henley Open 2018 (C)	2018-09-08	2018-09-08	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
43	Dr Pieter Hangelbroek Ope 2018 (D)	2018-09-01	2018-09-01	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
44	TST-MSA Tournament 2018 (D)	2018-07-21	2018-07-21	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
45	D8 Team League 2018 (U13)	2018-07-28	2018-07-28	Standard	Sedibeng (GSV)	5	0	0	No	Analysis
46	Broadland`s Knights Chess Open 2018 (C)	2018-06-16	2018-06-16	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
47	Word of Life Open 2018 (C)	2018-05-12	2018-05-12	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
48	Amigo Spur Eligwa Chess Open 2018 (C)	2018-05-19	2018-05-19	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
49	Henley Open 2018 (C)	2018-03-10	2018-03-10	Standard	Sedibeng (GSV)	5	5	3.5	Yes	Analysis
50	Carels Open 2018 (C)	2018-03-03	2018-03-03	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
51	South African Junior Team Championships 2017 (U12D)	2018-01-04	2018-01-08	Standard	4 Knights (4K)	7	7	4.5	Yes	Analysis

#	Games	Start				End
1	7	Tournament Overvaal Chess Open 2019				Tournament TST-MSA Chess Open 2019
		date 2019-06-15	rnd 2	type Standard	result 1	date 2019-07-20	rnd 3	type Standard	result 1
		Opponent Hanekom, D (Dylan)				Opponent Matsunyane, E (Edwin)
2	7	Tournament South African Junior Team Championships 2018				Tournament Carels Open 2019
		date 2018-12-16	rnd 2	type Standard	result 0.5	date 2019-03-02	rnd 1	type Standard	result 1
		Opponent Fourie, G (Guillaume)				Opponent Scheepers, C (Coenraad)
3	6	Tournament 2019 South African Junior Team Championships				Tournament 2019 South African Junior Team Championships
		date 2020-01-04	rnd 2	type Standard	result 1	date 2020-01-08	rnd 7	type Standard	result 1
		Opponent Moroka, K (Kelebogile)				Opponent Diremelo, MO (Mpho Oarabile)

#	Games	Start				End
1	7	Tournament Overvaal Chess Open 2019				Tournament TST-MSA Chess Open 2019
		date 2019-06-15	rnd 2	type Standard	result 1	date 2019-07-20	rnd 3	type Standard	result 1
		Opponent Hanekom, D (Dylan)				Opponent Matsunyane, E (Edwin)
2	7	Tournament South African Junior Team Championships 2018				Tournament Carels Open 2019
		date 2018-12-16	rnd 2	type Standard	result 0.5	date 2019-03-02	rnd 1	type Standard	result 1
		Opponent Fourie, G (Guillaume)				Opponent Scheepers, C (Coenraad)
3	6	Tournament 2019 South African Junior Team Championships				Tournament 2019 South African Junior Team Championships
		date 2020-01-04	rnd 2	type Standard	result 1	date 2020-01-08	rnd 7	type Standard	result 1
		Opponent Moroka, K (Kelebogile)				Opponent Diremelo, MO (Mpho Oarabile)

#	Games	Start				End
1	4	Tournament Midvaal Winter Classic 13 July 2024				Tournament Gauteng Top Schools 2024
		date 2024-07-13	rnd 7	type Rapid	result 0.5	date 2024-10-05	rnd 3	type Rapid	result 1
		Opponent Van Heerden, D (Derick)				Opponent Steyn, T (Tjaart)
2	1	Tournament Midvaal Winter Classic 13 July 2024				Tournament Midvaal Winter Classic 13 July 2024
		date 2024-07-13	rnd 4	type Rapid	result 1	date 2024-07-13	rnd 4	type Rapid	result 1
		Opponent Dliwayo, T (Thabo)				Opponent Dliwayo, T (Thabo)
3	1	Tournament Dr Pieter Hangelbroek Rapid 2023				Tournament Dr Pieter Hangelbroek Rapid 2023
		date 2023-10-28	rnd 5	type Rapid	result 0.5	date 2023-10-28	rnd 5	type Rapid	result 0.5
		Opponent Khumalo, N (Nkosinathi)				Opponent Khumalo, N (Nkosinathi)

No games found.

#	Games	Start				End

#	Games	Start				End
1	7	Tournament Overvaal Chess Open 2019				Tournament TST-MSA Chess Open 2019
		date 2019-06-15	rnd 2	type Standard	result 1	date 2019-07-20	rnd 3	type Standard	result 1
		Opponent Hanekom, D (Dylan)				Opponent Matsunyane, E (Edwin)
2	6	Tournament Dr Pieter Hangelbroek Ope 2018				Tournament Henley Open 2018
		date 2018-09-01	rnd 2	type Standard	result 1	date 2018-09-08	rnd 2	type Standard	result 1
		Opponent Marumo, K (Kelebokgile)				Opponent Marema, P (Phindile)
3	6	Tournament Broadland`s Knights Chess Open 2018				Tournament TST-MSA Tournament 2018
		date 2018-06-16	rnd 2	type Standard	result 1	date 2018-07-21	rnd 2	type Standard	result 1
		Opponent Karsten, K (Keagan)				Opponent Botha, L (Liane)

#	Games	Start				End
1	7	Tournament Overvaal Chess Open 2019				Tournament TST-MSA Chess Open 2019
		date 2019-06-15	rnd 2	type Standard	result 1	date 2019-07-20	rnd 3	type Standard	result 1
		Opponent Hanekom, D (Dylan)				Opponent Matsunyane, E (Edwin)
2	6	Tournament Dr Pieter Hangelbroek Ope 2018				Tournament Henley Open 2018
		date 2018-09-01	rnd 2	type Standard	result 1	date 2018-09-08	rnd 2	type Standard	result 1
		Opponent Marumo, K (Kelebokgile)				Opponent Marema, P (Phindile)
3	6	Tournament Broadland`s Knights Chess Open 2018				Tournament TST-MSA Tournament 2018
		date 2018-06-16	rnd 2	type Standard	result 1	date 2018-07-21	rnd 2	type Standard	result 1
		Opponent Karsten, K (Keagan)				Opponent Botha, L (Liane)

#	Games	Start				End
1	3	Tournament Gauteng Top Schools 2024				Tournament Gauteng Top Schools 2024
		date 2024-10-05	rnd 1	type Rapid	result 1	date 2024-10-05	rnd 3	type Rapid	result 1
		Opponent Hudson, C (Calib)				Opponent Steyn, T (Tjaart)
2	1	Tournament Midvaal Winter Classic 13 July 2024				Tournament Midvaal Winter Classic 13 July 2024
		date 2024-07-13	rnd 4	type Rapid	result 1	date 2024-07-13	rnd 4	type Rapid	result 1
		Opponent Dliwayo, T (Thabo)				Opponent Dliwayo, T (Thabo)
3	1	Tournament Dr Pieter Hangelbroek Rapid 2023				Tournament Dr Pieter Hangelbroek Rapid 2023
		date 2023-10-28	rnd 2	type Rapid	result 1	date 2023-10-28	rnd 2	type Rapid	result 1
		Opponent Venter, M (Margaretha Aw)				Opponent Venter, M (Margaretha Aw)

No games found.

#	Games	Start				End

Top 10 opponents most often played

#	Opponent	Main			Standard			Rapid			Blitz
		Gms	Score	Dp	Gms	Score	Dp	Gms	Score	Dp	Gms	Score	Dp
		Gms	Aor	Prat	Gms	Aor	Prat	Gms	Aor	Prat	Gms	Aor	Prat
1	Van Zyl ,I (Ilane)	4	2	0	4	2	0	0	0	0	0	0	0
1	Van Zyl ,I (Ilane)	4	964.8	964.8	4	965	964.8	0	0	0	0	0	0
2	Hanekom ,J (Jayden)	3	2	141.7	3	2	141.7	0	0	0	0	0	0
2	Hanekom ,J (Jayden)	3	843.1	984.8	3	848.8	984.8	0	0	0	0	0	0
3	Mini ,S (Siboniso)	3	0	-425	3	0	-425	0	0	0	0	0	0
3	Mini ,S (Siboniso)	3	1462.2	1037.2	3	1459.7	1037.2	0	0	0	0	0	0
4	Goosen ,M (Mignon)	3	1	-141.7	3	1	-141.7	0	0	0	0	0	0
4	Goosen ,M (Mignon)	3	1392.8	1251.1	3	1384.4	1251.1	0	0	0	0	0	0
5	Mittermaier ,G (Gunther)	3	2	141.7	3	2	141.7	0	0	0	0	0	0
5	Mittermaier ,G (Gunther)	3	1553.4	1695	3	1564.2	1695	0	0	0	0	0	0
6	Coetzee ,A (Anika)	3	2	141.7	3	2	141.7	0	0	0	0	0	0
6	Coetzee ,A (Anika)	3	1101.4	1243.1	3	1088.4	1243.1	0	0	0	0	0	0
7	Theron ,A (Andre)	3	0	-425	2	0	-425	1	0	-425	0	0	0
7	Theron ,A (Andre)	3	1550	1125	2	1542.5	1125	1	1581	1125	0	0	0
8	Khumalo ,N (Nkosinathi)	3	1.5	0	2	1	0	1	0.5	0	0	0	0
8	Khumalo ,N (Nkosinathi)	3	1206.7	1206.7	2	1207.8	1206.7	1	500	1206.7	0	0	0
9	Visser ,TM (Tracy)	3	2	141.7	2	1	0	1	1	425	0	0	0
9	Visser ,TM (Tracy)	3	1019.5	1161.1	2	860.4	1019.5	1	729.6	1444.5	0	0	0
10	Tabane ,G (Gomolemo)	2	1	0	2	1	0	0	0	0	0	0	0
10	Tabane ,G (Gomolemo)	2	1010.8	1010.8	2	1010.7	1010.8	0	0	0	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

Ratings

Tournaments

Grand Prix

Statistics

Notifications

PLAYER PAGE

Personal

Jonker, J (Jaen-Pierre)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms