Chess South Africa Ratings Database

PLAYER PAGE

Personal

Jonker, MD (Matthew Douglas)

Chess SA id

187014313

FIDE id

Date of birth

1987-02-27 (Adult)

Gender

Male

Region

Johannesburg Metro (GJM)

Citizen

RSA

Titles

RM,FI

Chess SA registered

Last active game

2023-09-02

Personal details last changed

2025-05-25

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	2020.9	2041	2018	1934.4
Raw rating	2020.9	2041	2018	1934.4
Weighted rating	2020.7	2041	2017.8	1934.2
Weighted performance	1177.4	0	0	0
Floor	1541	1541	1541	1541
K-factor	20	20	20	20
Min/Max rating change allowed	51.5	50	51.7	58.2
Highest rating	2041 2018-03-01	2041 2018-03-01	2041 2018-03-01	2041 2018-03-01
Highest raw rating	2041 2020-01-01	2041 2024-02-01	2041 2020-01-01	2041 2020-01-01
Highest weighted rating	2041 2018-03-01	2041 2018-03-01	2041 2018-03-01	2041 2018-03-01
Highest weighted performance	1790.6 2022-11-01	1200 2024-02-01	1795.6 2022-11-01	1539.1 2022-08-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	2020.9	2041	2018	1934.4
Analysis
Rating	2020.9	2041	2018	1934.4
Raw rating	2020.9	2041	2018	1934.4
Weighted rating	2020.7	2041	2017.8
Weighted performance	1177.4	0	0
K-factor	20	20	20	20
Floor	1541	1541	1541	1541
Max/Min rating change allowed	51.5	50	51.7	58.2
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	2020.9	2041	2018	1934.4
New weighted rating	2020.8	2041	2017.8	1934.2
New weighted performance	1167.5	0	0	0
Temp new rating	2020.9	2041	2018	1934.4
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	2020.9	2041	2018	1934.4
New K-factor	20	20	20	20
New floor	1541	1541	1541	1541

Item	Main	Standard	Rapid	Blitz
	0	0	0	0
	0	0	0	0
	0	0	0	0
	22	0	6	16
	15	0	6	9
	0	0	0	0
History	183	146	12	25

Games since
	Main 0	Standard 0		Rapid 0		Blitz 0
Gender	Male
Age group	Adult
Region	Johannesburg Metro (GJM)
Province	Gauteng (GT)
Main
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
Adult	-1		-1		-1
Adult Male	-1		-1		-1
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
Adult	-1		-1		-1
Adult Male	-1		-1		-1
Rapid
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
Adult	-1		-1		-1
Adult Male	-1		-1		-1
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
Adult	-1		-1		-1
Adult 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	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
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	37	23	62.16	103.4	1733.4	1836.8
Standard	0	0	0	0	0	0
Rapid	12	6.5	54.17	35.4	1919.8	1955.2
Blitz	25	16.5	66	136	1643.9	1779.9

Date	Main	Standard	Rapid	Blitz
2025-11-01	2020.9	2041	2018	1934.4
2025-09-30	2020.9	2041	2018	1934.4
2025-09-01	2020.9	2041	2018	1934.4
2025-08-01	2020.9	2041	2018	1934.4
2025-07-01	2020.9	2041	2018	1934.4
2025-06-01	2020.9	2041	2018	1934.4
2025-05-01	2020.9	2041	2018	1934.4
2025-04-01	2020.9	2041	2018	1934.4
2025-03-01	2020.9	2041	2018	1934.4
2025-02-01	2020.9	2041	2018	1934.4
2025-01-01	2020.5	2041	2017.4	1933.8
2024-12-01	2020.5	2041	2017.4	1933.8
2024-11-01	2020.5	2041	2017.4	1933.8
2024-10-01	2020.5	2041	2017.4	1933.8
2024-09-01	2020.5	2041	2017.4	1933.8
2024-08-01	2020.5	2041	2017.4	1933.8
2024-07-01	2020.5	2041	2017.4	1933.8
2024-09-01	2020.5	2041	2017.4	1933.8
2024-05-01	2020.5	2041	2017.4	1933.8
2024-04-01	2020.5	2041	2017.4	1933.8
2024-03-01	2020.5	2041	2017.4	1933.8
2024-02-01	2020.5	2041	2017.4	1933.8
2024-01-01	2020.5	2041	2017.4	1933.8
2023-12-01	2020.5	2041	2017.4	1933.8

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	Mzansi Spring Rapid 2023	2023-09-02	2023-09-02	Rapid	Johannesburg Metro (GJM)	7	6	4	Yes	Analysis
2	JMC Blitz - Higher Ground 2023	2023-06-17	2023-06-17	Blitz	Johannesburg Metro (GJM)	7	7	5.5	Yes	Analysis
3	Mzansi Open Blitz 2023	2023-04-29	2023-04-29	Blitz	Johannesburg Metro (GJM)	9	9	5	Yes	Analysis
4	CPH Chess Clubs Challenge 2022 (A)	2022-11-12	2022-11-12	Rapid	Johannesburg Metro (GJM)	7	6	2.5	Yes	Analysis
5	JMC Blitz Open 8 August 2022 (A)	2022-08-08	2022-08-08	Blitz	Johannesburg Metro (GJM)	9	9	6	Yes	Analysis

#	Games	Start				End
1	5	Tournament JMC Blitz - Higher Ground 2023				Tournament Mzansi Spring Rapid 2023
		date 2023-06-17	rnd 5	type Blitz	result 1	date 2023-09-02	rnd 3	type Rapid	result 1
		Opponent Rossouw, AJ (Andries)				Opponent Jacobs, CN (Calvin Nicholas)
2	4	Tournament Mzansi Open Blitz 2023				Tournament JMC Blitz - Higher Ground 2023
		date 2023-04-29	rnd 9	type Blitz	result 0.5	date 2023-06-17	rnd 3	type Blitz	result 1
		Opponent Sullivan, J (Jason)				Opponent Naidoo, K (Kajol)
3	3	Tournament Mzansi Open Blitz 2023				Tournament Mzansi Open Blitz 2023
		date 2023-04-29	rnd 4	type Blitz	result 1	date 2023-04-29	rnd 6	type Blitz	result 1
		Opponent Felix, R (Raphael)				Opponent Mnyasta, T (Tezihano)

No games found.

#	Games	Start				End

#	Games	Start				End
1	3	Tournament CPH Chess Clubs Challenge 2022				Tournament CPH Chess Clubs Challenge 2022
		date 2022-11-12	rnd 3	type Rapid	result 0.5	date 2022-11-12	rnd 6	type Rapid	result 1
		Opponent Khumalo, KB (Keith)				Opponent Mlahleki, V (Vusimuzi)
2	2	Tournament Mzansi Spring Rapid 2023				Tournament Mzansi Spring Rapid 2023
		date 2023-09-02	rnd 5	type Rapid	result 1	date 2023-09-02	rnd 6	type Rapid	result 1
		Opponent Jaitas, K (Kittisak)				Opponent Gounder, A (Arun)
3	2	Tournament Mzansi Spring Rapid 2023				Tournament Mzansi Spring Rapid 2023
		date 2023-09-02	rnd 2	type Rapid	result 1	date 2023-09-02	rnd 3	type Rapid	result 1
		Opponent Chikwava, R (Ronald)				Opponent Jacobs, CN (Calvin Nicholas)

#	Games	Start				End
1	4	Tournament Mzansi Open Blitz 2023				Tournament JMC Blitz - Higher Ground 2023
		date 2023-04-29	rnd 9	type Blitz	result 0.5	date 2023-06-17	rnd 3	type Blitz	result 1
		Opponent Sullivan, J (Jason)				Opponent Naidoo, K (Kajol)
2	3	Tournament JMC Blitz - Higher Ground 2023				Tournament JMC Blitz - Higher Ground 2023
		date 2023-06-17	rnd 5	type Blitz	result 1	date 2023-06-17	rnd 7	type Blitz	result 0.5
		Opponent Rossouw, AJ (Andries)				Opponent Maliga, N (Norman)
3	3	Tournament Mzansi Open Blitz 2023				Tournament Mzansi Open Blitz 2023
		date 2023-04-29	rnd 4	type Blitz	result 1	date 2023-04-29	rnd 6	type Blitz	result 1
		Opponent Felix, R (Raphael)				Opponent Mnyasta, T (Tezihano)

#	Games	Start				End
1	3	Tournament JMC Blitz - Higher Ground 2023				Tournament JMC Blitz - Higher Ground 2023
		date 2023-06-17	rnd 1	type Blitz	result 1	date 2023-06-17	rnd 3	type Blitz	result 1
		Opponent Kojetin, C (Connor)				Opponent Naidoo, K (Kajol)
2	3	Tournament Mzansi Open Blitz 2023				Tournament Mzansi Open Blitz 2023
		date 2023-04-29	rnd 4	type Blitz	result 1	date 2023-04-29	rnd 6	type Blitz	result 1
		Opponent Felix, R (Raphael)				Opponent Mnyasta, T (Tezihano)
3	2	Tournament Mzansi Spring Rapid 2023				Tournament Mzansi Spring Rapid 2023
		date 2023-09-02	rnd 5	type Rapid	result 1	date 2023-09-02	rnd 6	type Rapid	result 1
		Opponent Jaitas, K (Kittisak)				Opponent Gounder, A (Arun)

No games found.

#	Games	Start				End

#	Games	Start				End
1	2	Tournament Mzansi Spring Rapid 2023				Tournament Mzansi Spring Rapid 2023
		date 2023-09-02	rnd 5	type Rapid	result 1	date 2023-09-02	rnd 6	type Rapid	result 1
		Opponent Jaitas, K (Kittisak)				Opponent Gounder, A (Arun)
2	2	Tournament Mzansi Spring Rapid 2023				Tournament Mzansi Spring Rapid 2023
		date 2023-09-02	rnd 2	type Rapid	result 1	date 2023-09-02	rnd 3	type Rapid	result 1
		Opponent Chikwava, R (Ronald)				Opponent Jacobs, CN (Calvin Nicholas)
3	2	Tournament CPH Chess Clubs Challenge 2022				Tournament CPH Chess Clubs Challenge 2022
		date 2022-11-12	rnd 4	type Rapid	result 1	date 2022-11-12	rnd 6	type Rapid	result 1
		Opponent Mthombeni, S (Sanele)				Opponent Mlahleki, V (Vusimuzi)

#	Games	Start				End
1	3	Tournament JMC Blitz - Higher Ground 2023				Tournament JMC Blitz - Higher Ground 2023
		date 2023-06-17	rnd 1	type Blitz	result 1	date 2023-06-17	rnd 3	type Blitz	result 1
		Opponent Kojetin, C (Connor)				Opponent Naidoo, K (Kajol)
2	3	Tournament Mzansi Open Blitz 2023				Tournament Mzansi Open Blitz 2023
		date 2023-04-29	rnd 4	type Blitz	result 1	date 2023-04-29	rnd 6	type Blitz	result 1
		Opponent Felix, R (Raphael)				Opponent Mnyasta, T (Tezihano)
3	2	Tournament JMC Blitz - Higher Ground 2023				Tournament JMC Blitz - Higher Ground 2023
		date 2023-06-17	rnd 5	type Blitz	result 1	date 2023-06-17	rnd 6	type Blitz	result 1
		Opponent Rossouw, AJ (Andries)				Opponent Kruger, T (Tobias)

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	Mlahleki ,V (Vusimuzi)	2	1	0	0	0	0	1	1	425	1	0	-425
1	Mlahleki ,V (Vusimuzi)	2	1982.9	1982.9	0	0	0	1	1863.3	2407.9	1	1985.3	1557.9
2	Cawdery ,DJ (Daniel John)	1	0	-425	0	0	0	1	0	-425	0	0	0
2	Cawdery ,DJ (Daniel John)	1	2370	1945	0	0	0	1	2426.9	1945	0	0	0
3	Khumalo ,KB (Keith Babongile)	1	0.5	0	0	0	0	1	0.5	0	0	0	0
3	Khumalo ,KB (Keith Babongile)	1	2126.6	2126.6	0	0	0	1	2063.4	2126.6	0	0	0
4	Jacobs ,CN (Calvin Nicholas)	1	1	425	0	0	0	1	1	425	0	0	0
4	Jacobs ,CN (Calvin Nicholas)	1	1695.2	2120.2	0	0	0	1	970.8	2120.2	0	0	0
5	Van Rensburg ,RP (Ryan Pierre)	1	0	-425	0	0	0	1	0	-425	0	0	0
5	Van Rensburg ,RP (Ryan Pierre)	1	2193.2	1768.2	0	0	0	1	2198.8	1768.2	0	0	0
6	Jaitas ,K (Kittisak)	1	1	425	0	0	0	1	1	425	0	0	0
6	Jaitas ,K (Kittisak)	1	1580.4	2005.4	0	0	0	1	1285	2005.4	0	0	0
7	Grover ,S (Sahaj)	1	0	-425	0	0	0	1	0	-425	0	0	0
7	Grover ,S (Sahaj)	1	2524.8	2099.8	0	0	0	1	2549.3	2099.8	0	0	0
8	Mthombeni ,S (Sanele)	1	1	425	0	0	0	1	1	425	0	0	0
8	Mthombeni ,S (Sanele)	1	1345.8	1770.8	0	0	0	1	1043.4	1770.8	0	0	0
9	Boheim ,E (Eugene)	1	1	425	0	0	0	0	0	0	1	1	425
9	Boheim ,E (Eugene)	1	1471.3	1896.3	0	0	0	0	0	0	1	1069	1896.3
10	Naidoo ,K (Kajol)	1	1	425	0	0	0	0	0	0	1	1	425
10	Naidoo ,K (Kajol)	1	1451.9	1876.9	0	0	0	0	0	0	1	1218.7	1876.9

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

Ratings

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PLAYER PAGE

Personal

Jonker, MD (Matthew Douglas)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms