Chess South Africa Ratings Database

PLAYER PAGE

Personal

Jonker, C (Corne)

Chess SA id

1130131410

FIDE id

Date of birth

2013-03-22 (U14)

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	1359.9	1368.3	1164.8	1200
Raw rating	1357.4	1368.3	1164.8	1200
Weighted rating	1299.9	1306.6	1163.5	1200
Weighted performance	1359.9	1361.2	0	0
Floor	857.4	868.3	700	700
K-factor	36	36	36	36
Min/Max rating change allowed	132.5	130.5	174.3	165.8
Highest rating	1359.9 2026-01-01	1368.3 2026-01-01	1200 2018-10-01	1200 2018-10-01
Highest raw rating	1357.4 2026-01-01	1368.3 2026-01-01	1200 2020-01-01	1200 2024-02-01
Highest weighted rating	1299.9 2026-01-01	1306.6 2026-01-01	1200 2018-10-01	1200 2018-10-01
Highest weighted performance	1359.9 2026-01-01	1361.2 2026-01-01	1200 2020-01-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	-2.5	0	0	0
New rating	1357.4	1368.3	1164.8	1200
Analysis
Rating	1359.9	1368.3	1164.8	1200
Raw rating	1357.4	1368.3	1164.8	1200
Weighted rating	1299.9	1306.6	1163.5
Weighted performance	1359.9	1361.2	0
K-factor	36	36	36	36
Floor	857.4	868.3	700	700
Max/Min rating change allowed	132.5	130.5	174.3	165.8
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	1357.4	1368.3	1164.8	1200
New weighted rating	1305.7	1312.8	1163.9	1200
New weighted performance	1350.7	1352	0	0
Temp new rating	1357.4	1368.3	1164.8	1200
Temp new rating +/-	-2.5	0	0	0
Final new rating +/-	-2.5	0	0	0
New rating	1357.4	1368.3	1164.8	1200
New K-factor	36	36	36	36
New floor	857.4	868.3	700	700

Item	Main	Standard	Rapid
	0	0	0
	20	20	0
	46	39	7
	40	30	10
	10	10	0
	0	0	0
History	127	110	17

Games since
	Main 66	Standard 59		Rapid 7		Blitz 0
Gender	Male
Age group	U14
Region	Sedibeng (GSV)
Province	Gauteng (GT)
Main
	RSA		Province		Region
Overall	3104		1036		110
Male	2435		807		88
U14	577		182		28
U14 Male	416		126		20
Standard
	RSA		Province		Region
Overall	2923		1061		112
Male	2327		846		89
U14	529		183		30
U14 Male	382		128		20
Rapid
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U14	-1		-1		-1
U14 Male	-1		-1		-1
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U14	-1		-1		-1
U14 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	20	11	55	42.5	1316	1358.5
Standard	20	11	55	42.5	1316	1358.5
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	127	64.5	50.79	6.7	1260.5	1267.2
Standard	110	57.5	52.27	19.3	1254.6	1273.9
Rapid	17	7	41.18	-75	1299	1224
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2026-01-01	1357.4	1368.3	1164.8	1200
2025-11-30	1318.5	1325.8	1164.8	1200
2025-11-01	1318.5	1325.8	1164.8	1200
2025-09-30	1318.5	1325.8	1164.8	1200
2025-09-01	1296.7	1301.3	1164.8	1200
2025-08-01	1296.7	1301.3	1164.8	1200
2025-07-01	1308.8	1318.9	1164.8	1200
2025-06-01	1284.2	1291.5	1164.8	1200
2025-05-01	1284.2	1291.5	1164.8	1200
2025-04-01	1284.2	1291.5	1164.8	1200
2025-03-01	1267.9	1274.1	1164.8	1200
2025-02-01	1266.6	1272.3	1164.8	1200
2025-01-01	1254.9	1252.6	1164.8	1200
2024-12-01	1312.4	1315.6	1164.8	1200
2024-11-01	1312.7	1316	1164.8	1200
2024-10-01	1329.7	1338	1164.8	1200
2024-09-01	1329.7	1338	1164.8	1200
2024-11-01	1293	1295.1	1164.8	1200
2024-07-01	1258.8	1271	1146.8	1200
2024-06-01	1258.8	1271	1146.8	1200
2024-05-01	1233.1	1241.8	1146.8	1200
2024-04-01	1233.1	1241.8	1146.8	1200
2024-03-01	1207.1	1211.9	1146.8	1200
2024-02-01	1207.1	1211.9	1146.8	1200

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 (U14 Candidates)	2025-12-06	2025-12-07	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
2	Laerskool Eligwa Open 20 Sept 2025 (D)	2025-09-20	2025-09-20	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
3	Eureka Chess Open 26 July 2025 (F)	2025-07-26	2025-07-26	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
4	HS Driehoek Chess Open 2025 (D)	2025-06-14	2025-06-14	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
5	Hoerskool Drie Riviere Open 08 March 2025 (D)	2025-03-08	2025-03-08	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
6	Gauteng Inter-Region at UJ 2024 (U12 Open)	2024-12-07	2024-12-08	Standard	Johannesburg Metro (GJM)	5	5	0	Yes	Analysis
7	Queens Gambit Chess Open 2024 (D)	2024-11-23	2024-11-23	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
8	Fonteine Open 2024 (D)	2024-10-19	2024-10-19	Standard	Sedibeng (GSV)	5	5	2.5	Yes	Analysis
9	Sedibeng West District Schools Chess Team's Championships 2024 (U11)	2024-08-12	2024-08-12	Standard	Sedibeng (GSV)	5	4	3	Yes	Analysis
10	Eureka Open 27 July 2024 (G)	2024-07-27	2024-07-27	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
11	Midvaal Winter Classic 13 July 2024 (E)	2024-07-13	2024-07-13	Rapid	Sedibeng (GSV)	7	7	3.5	Yes	Analysis
12	Sedibeng Chess Open 11 May 2024 (U11)	2024-05-11	2024-05-11	Standard	Sedibeng (GSV)	5	5	3.5	Yes	Analysis
13	Valia's Open 2024 (E)	2024-03-02	2024-03-02	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
14	2024 Gauteng Inter-Region Chess Championship (U12A)	2024-01-13	2024-01-14	Standard	Tshwane (GTP)	5	5	1.5	Yes	Analysis
15	Dr Pieter Hangelbroek Rapid 2023 (C)	2023-10-28	2023-10-28	Rapid	Sedibeng (GSV)	5	5	1.5	Yes	Analysis
16	2023 Gauteng Top Schools (U11 Mixed)	2023-08-18	2023-08-18	Standard	West Rand (GWR)	5	5	1.5	Yes	Analysis
17	2023 Sedibeng West District Schools Chess Tournament (U9+U11)	2023-08-12	2023-08-12	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
18	Overvaal Ope Jul 2023 (D)	2023-07-22	2023-07-22	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
19	VaalPark Primary Open Chess 2023 (C)	2023-06-16	2023-06-16	Rapid	Sedibeng (GSV)	5	5	2	Yes	Analysis
20	Valia's Chess Tournament 2023 (D)	2023-05-06	2023-05-06	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
21	Driehoek Open Chess Tournament 2023 (D)	2023-05-13	2023-05-13	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
22	Hoerskool Drie Riviere Open 2023 (D)	2023-03-11	2023-03-11	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
23	Carel`s Chess Open 2022 (D)	2022-03-05	2022-03-05	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
24	Heidelberg Klub Open 2002 (D)	2022-02-19	2022-02-19	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
25	Hoerskool Drie Riviere 2020 (F)	2020-03-07	2020-03-07	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
26	AG Visser 2020 (D)	2020-02-22	2020-02-22	Standard	Sedibeng (GSV)	6	6	2.5	Yes	Analysis

#	Games	Start				End
1	6	Tournament Hoerskool Drie Riviere Open 2023				Tournament Valia's Chess Tournament 2023
		date 2023-03-11	rnd 3	type Standard	result 1	date 2023-05-06	rnd 3	type Standard	result 1
		Opponent Smit, L (Liane)				Opponent Emanuel, S (Shiloh)
2	5	Tournament AG Visser 2020				Tournament Hoerskool Drie Riviere 2020
		date 2020-02-22	rnd 4	type Standard	result 0.5	date 2020-03-07	rnd 2	type Standard	result 1
		Opponent Coetzer, N (Nathan)				Opponent Chaka, N (Naomi)
3	4	Tournament Sedibeng Chess Open 11 May 2024				Tournament Midvaal Winter Classic 13 July 2024
		date 2024-05-11	rnd 3	type Standard	result 1	date 2024-07-13	rnd 1	type Rapid	result 1
		Opponent Mosia, N (Ntokozo)				Opponent Coetzer, A (Ashlynn)

#	Games	Start				End
1	6	Tournament Hoerskool Drie Riviere Open 2023				Tournament Valia's Chess Tournament 2023
		date 2023-03-11	rnd 3	type Standard	result 1	date 2023-05-06	rnd 3	type Standard	result 1
		Opponent Smit, L (Liane)				Opponent Emanuel, S (Shiloh)
2	5	Tournament Driehoek Open Chess Tournament 2023				Tournament Overvaal Ope Jul 2023
		date 2023-05-13	rnd 3	type Standard	result 1	date 2023-07-22	rnd 2	type Standard	result 1
		Opponent Meintjies, L (Louis)				Opponent Nagel, D (Divan)
3	5	Tournament AG Visser 2020				Tournament Hoerskool Drie Riviere 2020
		date 2020-02-22	rnd 4	type Standard	result 0.5	date 2020-03-07	rnd 2	type Standard	result 1
		Opponent Coetzer, N (Nathan)				Opponent Chaka, N (Naomi)

#	Games	Start				End
1	3	Tournament Midvaal Winter Classic 13 July 2024				Tournament Midvaal Winter Classic 13 July 2024
		date 2024-07-13	rnd 3	type Rapid	result 1	date 2024-07-13	rnd 5	type Rapid	result 1
		Opponent Blignaut, A (Alma)				Opponent Visser, A (Aidan)
2	2	Tournament VaalPark Primary Open Chess 2023				Tournament VaalPark Primary Open Chess 2023
		date 2023-06-16	rnd 3	type Rapid	result 1	date 2023-06-16	rnd 4	type Rapid	result 1
		Opponent Du Randt, P (Phillip)				Opponent Boloko, M (Mohau)
3	1	Tournament Midvaal Winter Classic 13 July 2024				Tournament Midvaal Winter Classic 13 July 2024
		date 2024-07-13	rnd 1	type Rapid	result 1	date 2024-07-13	rnd 1	type Rapid	result 1
		Opponent Coetzer, A (Ashlynn)				Opponent Coetzer, A (Ashlynn)

No games found.

#	Games	Start				End

#	Games	Start				End
1	6	Tournament Hoerskool Drie Riviere Open 2023				Tournament Valia's Chess Tournament 2023
		date 2023-03-11	rnd 3	type Standard	result 1	date 2023-05-06	rnd 3	type Standard	result 1
		Opponent Smit, L (Liane)				Opponent Emanuel, S (Shiloh)
2	3	Tournament Fonteine Open 2024				Tournament Queens Gambit Chess Open 2024
		date 2024-10-19	rnd 5	type Standard	result 1	date 2024-11-23	rnd 2	type Standard	result 1
		Opponent Olivier, C (Christiaan Adriaan)				Opponent Buchebner, M (Mikayla)
3	3	Tournament Eureka Open 27 July 2024				Tournament Sedibeng West District Schools Chess Team's Championships 2024
		date 2024-07-27	rnd 5	type Standard	result 1	date 2024-08-12	rnd 2	type Standard	result 1
		Opponent Kitabazi, A (Audric)				Opponent Moloi, L (Lerato)

#	Games	Start				End
1	6	Tournament Hoerskool Drie Riviere Open 2023				Tournament Valia's Chess Tournament 2023
		date 2023-03-11	rnd 3	type Standard	result 1	date 2023-05-06	rnd 3	type Standard	result 1
		Opponent Smit, L (Liane)				Opponent Emanuel, S (Shiloh)
2	5	Tournament Driehoek Open Chess Tournament 2023				Tournament Overvaal Ope Jul 2023
		date 2023-05-13	rnd 3	type Standard	result 1	date 2023-07-22	rnd 2	type Standard	result 1
		Opponent Meintjies, L (Louis)				Opponent Nagel, D (Divan)
3	3	Tournament Fonteine Open 2024				Tournament Queens Gambit Chess Open 2024
		date 2024-10-19	rnd 5	type Standard	result 1	date 2024-11-23	rnd 2	type Standard	result 1
		Opponent Olivier, C (Christiaan Adriaan)				Opponent Buchebner, M (Mikayla)

#	Games	Start				End
1	2	Tournament VaalPark Primary Open Chess 2023				Tournament VaalPark Primary Open Chess 2023
		date 2023-06-16	rnd 3	type Rapid	result 1	date 2023-06-16	rnd 4	type Rapid	result 1
		Opponent Du Randt, P (Phillip)				Opponent Boloko, M (Mohau)
2	1	Tournament Midvaal Winter Classic 13 July 2024				Tournament Midvaal Winter Classic 13 July 2024
		date 2024-07-13	rnd 5	type Rapid	result 1	date 2024-07-13	rnd 5	type Rapid	result 1
		Opponent Visser, A (Aidan)				Opponent Visser, A (Aidan)
3	1	Tournament Midvaal Winter Classic 13 July 2024				Tournament Midvaal Winter Classic 13 July 2024
		date 2024-07-13	rnd 3	type Rapid	result 1	date 2024-07-13	rnd 3	type Rapid	result 1
		Opponent Blignaut, A (Alma)				Opponent Blignaut, A (Alma)

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	Nagel ,D (Divan)	6	2.5	-70.8	4	2.5	106.2	2	0	-425	0	0	0
1	Nagel ,D (Divan)	6	1362	1291.2	4	1327.2	1468.3	2	1200.4	937	0	0	0
2	Brand ,HVN (Hendrik van Niekerk (Henko))	4	0	-425	2	0	-425	2	0	-425	0	0	0
2	Brand ,HVN (Hendrik van Niekerk (Henko))	4	1363.3	938.3	2	1266.3	938.3	2	1230.8	938.3	0	0	0
3	Smit ,L (Liane)	3	3	425	3	3	425	0	0	0	0	0	0
3	Smit ,L (Liane)	3	1125.1	1550.1	3	1113.9	1550.1	0	0	0	0	0	0
4	Botha ,S (Shadette)	3	3	425	3	3	425	0	0	0	0	0	0
4	Botha ,S (Shadette)	3	1216.8	1641.8	3	1217.6	1641.8	0	0	0	0	0	0
5	Conradie ,I (Ingrid)	2	0	-425	2	0	-425	0	0	0	0	0	0
5	Conradie ,I (Ingrid)	2	1364.9	939.9	2	1365.4	939.9	0	0	0	0	0	0
6	Stenden ,L (Luke)	2	1	0	2	1	0	0	0	0	0	0	0
6	Stenden ,L (Luke)	2	1133.6	1133.6	2	1120	1133.6	0	0	0	0	0	0
7	Coetzer ,N (Nathan)	2	1	0	2	1	0	0	0	0	0	0	0
7	Coetzer ,N (Nathan)	2	1200	1200	2	1200	1200	0	0	0	0	0	0
8	Bannerman ,J (Jared)	2	0.5	-212.5	2	0.5	-212.5	0	0	0	0	0	0
8	Bannerman ,J (Jared)	2	990.2	777.7	2	969.7	777.7	0	0	0	0	0	0
9	Coleske ,T (Tyler)	2	0	-425	2	0	-425	0	0	0	0	0	0
9	Coleske ,T (Tyler)	2	1333.6	908.6	2	1333.6	908.6	0	0	0	0	0	0
10	Tshabalala ,O (Osiame)	2	0.5	-212.5	2	0.5	-212.5	0	0	0	0	0	0
10	Tshabalala ,O (Osiame)	2	1224.6	1012.1	2	1229.6	1012.1	0	0	0	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

Ratings

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PLAYER PAGE

Personal

Jonker, C (Corne)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms