Chess South Africa Ratings Database

PLAYER PAGE

Personal

Jonker, W (William)

Chess SA id

1170192575

FIDE id

Date of birth

2017-12-29 (U10)

Gender

Male

Region

West Coast (WCU)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-03-08

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

1050.7

Item	Main	Standard	Rapid	Blitz
Rating	1193.5	1161.3	1246.3	1200
Raw rating	1193.5	1161.3	1245.1	1200
Weighted rating	1192.4	1157.2	1246.3	1200
Weighted performance	1075.9	0	1126.4	0
Floor	734.2	700	755.1	700
K-factor	36	36	36	36
Min/Max rating change allowed	167.4	175.2	155.5	165.8
Highest rating	1275.4 2024-03-01	1200 2024-02-01	1343.5 2024-03-01	1200 2024-02-01
Highest raw rating	1234.2 2024-04-01	1200 2024-02-01	1255.1 2024-04-01	1200 2024-02-01
Highest weighted rating	1234.2 2024-05-01	1200 2024-02-01	1255.1 2024-10-01	1200 2024-02-01
Highest weighted performance	1275.4 2024-03-01	1200 2024-02-01	1343.5 2024-03-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0.4	0
New rating	1193.5	1161.3	1246.7	1200
Analysis
Rating	1193.5	1161.3	1246.3	1200
Raw rating	1193.5	1161.3	1245.1	1200
Weighted rating	1192.4	1157.2	1246.3
Weighted performance	1075.9	0	1126.4
K-factor	36	36	36	36
Floor	734.2	700	755.1	700
Max/Min rating change allowed	167.4	175.2	155.5	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	1193.5	1161.3	1245.1	1200
New weighted rating	1192.2	1157	1246.7	1200
New weighted performance	1075.5	0	1125.9	0
Temp new rating	1193.5	1161.3	1246.7	1200
Temp new rating +/-	0	0	0.4	0
Final new rating +/-	0	0	0.4	0
New rating	1193.5	1161.3	1246.7	1200
New K-factor	36	36	36	36
New floor	734.2	700	755.1	700

Item	Main	Standard	Rapid
	0	0	0
	23	5	18
	21	11	10
	0	0	0
	0	0	0
	0	0	0
History	44	16	28

Games since
	Main 44	Standard 16		Rapid 28		Blitz 0
Gender	Male
Age group	U10
Region	West Coast (WCU)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	4066		1353		154
Male	3049		944		105
U10	384		133		15
U10 Male	289		93		9
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U10	-1		-1		-1
U10 Male	-1		-1		-1
Rapid
	RSA		Province		Region
Overall	1370		695		170
Male	1089		535		123
U10	126		65		15
U10 Male	98		50		10
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U10	-1		-1		-1
U10 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	23	11	47.83	-18.5	1220.9	1202.4
Standard	5	2	40	-85	1233.7	1148.7
Rapid	18	9	50	0	1217.3	1217.3
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	44	21.5	48.86	-9.7	1204	1194.3
Standard	16	6	37.5	-106.2	1190.8	1084.6
Rapid	28	15.5	55.36	45.5	1211.5	1257
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-09-30	1193.5	1161.3	1245.1	1200
2025-09-01	1193.5	1161.3	1245.1	1200
2025-08-01	1193.5	1161.3	1245.1	1200
2025-07-01	1193.5	1161.3	1244.3	1200
2025-06-01	1193.5	1161.3	1243.4	1200
2025-05-01	1193.5	1161.3	1242.4	1200
2025-04-01	1193.5	1161.3	1241.3	1200
2025-03-01	1203.4	1162.5	1239.3	1200
2025-02-01	1191.8	1161.2	1255.1	1200
2025-01-01	1172.9	1128.4	1255.1	1200
2024-12-01	1172.9	1128.4	1255.1	1200
2024-11-01	1184.3	1139.6	1255.1	1200
2024-10-01	1184.3	1139.6	1255.1	1200
2024-09-01	1184.3	1139.6	1255.1	1200
2024-08-01	1184.3	1139.6	1255.1	1200
2024-07-01	1184.3	1139.6	1255.1	1200
2024-06-01	1184.3	1139.6	1255.1	1200
2024-08-01	1234.2	1200	1255.1	1200
2024-04-01	1234.2	1200	1255.1	1200
2024-03-01	1213	1200	1221.6	1200
2024-02-01	1200	1200	1200	1200
2024-01-01	1200	1200	1200	1200
2023-12-01	1200	1200	1200	1200
2023-11-01	1200	1200	1200	1200

Comming soon.

Tournaments

History

No tournaments found.

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Overberg Schools - PS Closed 2025 (U9 Boys)	2025-03-08	2025-03-08	Standard	Overberg (WOS)	5	5	2	Yes	Analysis
2	Overberg Schools - PS Trials (Region 2) 2025 (U9)	2025-02-15	2025-02-15	Rapid	Overberg (WOS)	6	6	4	Yes	Analysis
3	Curro Hermanus Summer Open 2025 (U9)	2025-02-08	2025-02-08	Rapid	Overberg (WOS)	6	6	3	Yes	Analysis
4	Overberg Schools & Federation Open 2025 (U9)	2025-02-01	2025-02-01	Rapid	Overberg (WOS)	6	6	2	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Overberg Schools - PS Closed 2025 (U9 Boys)	2025-03-08	2025-03-08	Standard	Overberg (WOS)	5	5	2	Yes	Analysis
2	Overberg Schools - PS Trials (Region 2) 2025 (U9)	2025-02-15	2025-02-15	Rapid	Overberg (WOS)	6	6	4	Yes	Analysis
3	Curro Hermanus Summer Open 2025 (U9)	2025-02-08	2025-02-08	Rapid	Overberg (WOS)	6	6	3	Yes	Analysis
4	Overberg Schools & Federation Open 2025 (U9)	2025-02-01	2025-02-01	Rapid	Overberg (WOS)	6	6	2	Yes	Analysis
5	PR Booyse Standard Tournament 024 (Development)	2024-11-02	2024-11-02	Standard	West Coast (WCU)	5	5	2	Yes	Analysis
6	Western Cape PS Individuals Championship 2024 (U7 Boys)	2024-05-04	2024-05-05	Standard	West Coast (WCU)	6	6	2	Yes	Analysis
7	West Coast Schools Chess Prestige Championships 2024 (U7)	2024-03-09	2024-03-09	Rapid	West Coast (WCU)	5	5	3.5	Yes	Analysis
8	Bo-Weskus Skole Prestige 2024 (O7)	2024-02-10	2024-02-10	Rapid	West Coast (WCU)	5	5	3	Yes	Analysis

#	Games	Start				End
1	5	Tournament Bo-Weskus Skole Prestige 2024				Tournament West Coast Schools Chess Prestige Championships 2024
		date 2024-02-10	rnd 2	type Rapid	result 1	date 2024-03-09	rnd 1	type Rapid	result 0.5
		Opponent De Klerk, F (Franquin)				Opponent Van Schalkwyk, L (Luke)
2	3	Tournament Curro Hermanus Summer Open 2025				Tournament Overberg Schools - PS Trials (Region 2) 2025
		date 2025-02-08	rnd 6	type Rapid	result 1	date 2025-02-15	rnd 2	type Rapid	result 1
		Opponent Van der Westhuizen, L (Leah)				Opponent Dube, Z (Zayne)
3	3	Tournament West Coast Schools Chess Prestige Championships 2024				Tournament West Coast Schools Chess Prestige Championships 2024
		date 2024-03-09	rnd 3	type Rapid	result 1	date 2024-03-09	rnd 5	type Rapid	result 1
		Opponent Swartz, L (Leviah)				Opponent Skippers, D (Devedene)

#	Games	Start				End
1	2	Tournament PR Booyse Standard Tournament 024				Tournament PR Booyse Standard Tournament 024
		date 2024-11-02	rnd 3	type Standard	result 1	date 2024-11-02	rnd 4	type Standard	result 1
		Opponent Nel, C (Carel)				Opponent Halitile, O (Owothando)
2	2	Tournament Western Cape PS Individuals Championship 2024				Tournament Western Cape PS Individuals Championship 2024
		date 2024-05-04	rnd 4	type Standard	result 1	date 2024-05-05	rnd 5	type Standard	result 1
		Opponent Jacobs, S (Stefiano)				Opponent Le Roux, M (Markus)
3	1	Tournament Overberg Schools - PS Closed 2025				Tournament Overberg Schools - PS Closed 2025
		date 2025-03-08	rnd 5	type Standard	result 1	date 2025-03-08	rnd 5	type Standard	result 1
		Opponent Beyers, T (Tatum)				Opponent Beyers, T (Tatum)

#	Games	Start				End
1	5	Tournament Bo-Weskus Skole Prestige 2024				Tournament West Coast Schools Chess Prestige Championships 2024
		date 2024-02-10	rnd 2	type Rapid	result 1	date 2024-03-09	rnd 1	type Rapid	result 0.5
		Opponent De Klerk, F (Franquin)				Opponent Van Schalkwyk, L (Luke)
2	3	Tournament Curro Hermanus Summer Open 2025				Tournament Overberg Schools - PS Trials (Region 2) 2025
		date 2025-02-08	rnd 6	type Rapid	result 1	date 2025-02-15	rnd 2	type Rapid	result 1
		Opponent Van der Westhuizen, L (Leah)				Opponent Dube, Z (Zayne)
3	3	Tournament West Coast Schools Chess Prestige Championships 2024				Tournament West Coast Schools Chess Prestige Championships 2024
		date 2024-03-09	rnd 3	type Rapid	result 1	date 2024-03-09	rnd 5	type Rapid	result 1
		Opponent Swartz, L (Leviah)				Opponent Skippers, D (Devedene)

No games found.

#	Games	Start				End

#	Games	Start				End
1	3	Tournament Curro Hermanus Summer Open 2025				Tournament Overberg Schools - PS Trials (Region 2) 2025
		date 2025-02-08	rnd 6	type Rapid	result 1	date 2025-02-15	rnd 2	type Rapid	result 1
		Opponent Van der Westhuizen, L (Leah)				Opponent Dube, Z (Zayne)
2	3	Tournament West Coast Schools Chess Prestige Championships 2024				Tournament West Coast Schools Chess Prestige Championships 2024
		date 2024-03-09	rnd 3	type Rapid	result 1	date 2024-03-09	rnd 5	type Rapid	result 1
		Opponent Swartz, L (Leviah)				Opponent Skippers, D (Devedene)
3	2	Tournament PR Booyse Standard Tournament 024				Tournament PR Booyse Standard Tournament 024
		date 2024-11-02	rnd 3	type Standard	result 1	date 2024-11-02	rnd 4	type Standard	result 1
		Opponent Nel, C (Carel)				Opponent Halitile, O (Owothando)

#	Games	Start				End
1	2	Tournament PR Booyse Standard Tournament 024				Tournament PR Booyse Standard Tournament 024
		date 2024-11-02	rnd 3	type Standard	result 1	date 2024-11-02	rnd 4	type Standard	result 1
		Opponent Nel, C (Carel)				Opponent Halitile, O (Owothando)
2	2	Tournament Western Cape PS Individuals Championship 2024				Tournament Western Cape PS Individuals Championship 2024
		date 2024-05-04	rnd 4	type Standard	result 1	date 2024-05-05	rnd 5	type Standard	result 1
		Opponent Jacobs, S (Stefiano)				Opponent Le Roux, M (Markus)
3	1	Tournament Overberg Schools - PS Closed 2025				Tournament Overberg Schools - PS Closed 2025
		date 2025-03-08	rnd 5	type Standard	result 1	date 2025-03-08	rnd 5	type Standard	result 1
		Opponent Beyers, T (Tatum)				Opponent Beyers, T (Tatum)

#	Games	Start				End
1	3	Tournament Curro Hermanus Summer Open 2025				Tournament Overberg Schools - PS Trials (Region 2) 2025
		date 2025-02-08	rnd 6	type Rapid	result 1	date 2025-02-15	rnd 2	type Rapid	result 1
		Opponent Van der Westhuizen, L (Leah)				Opponent Dube, Z (Zayne)
2	3	Tournament West Coast Schools Chess Prestige Championships 2024				Tournament West Coast Schools Chess Prestige Championships 2024
		date 2024-03-09	rnd 3	type Rapid	result 1	date 2024-03-09	rnd 5	type Rapid	result 1
		Opponent Swartz, L (Leviah)				Opponent Skippers, D (Devedene)
3	1	Tournament Overberg Schools - PS Trials (Region 2) 2025				Tournament Overberg Schools - PS Trials (Region 2) 2025
		date 2025-02-15	rnd 6	type Rapid	result 1	date 2025-02-15	rnd 6	type Rapid	result 1
		Opponent Van Jaarsveld, F (Franco)				Opponent Van Jaarsveld, F (Franco)

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	Jansen ,E (Emile)	2	1	0	1	0	-425	1	1	425	0	0	0
1	Jansen ,E (Emile)	2	1190.9	1190.9	1	1200	765.9	1	1185	1615.9	0	0	0
2	Fourie ,D (Duan)	2	1	0	1	0	-425	1	1	425	0	0	0
2	Fourie ,D (Duan)	2	1178.3	1178.3	1	1200	753.3	1	1161.6	1603.3	0	0	0
3	Dube ,Z (Zayne)	2	2	425	1	1	425	1	1	425	0	0	0
3	Dube ,Z (Zayne)	2	1162.9	1587.9	1	1158.5	1587.9	1	1200	1587.9	0	0	0
4	Faasen ,C (Charles)	2	0	-425	0	0	0	2	0	-425	0	0	0
4	Faasen ,C (Charles)	2	1263.4	838.4	0	0	0	2	1268.1	838.4	0	0	0
5	Kuhn ,D (Dian)	2	0	-425	0	0	0	2	0	-425	0	0	0
5	Kuhn ,D (Dian)	2	1267.9	842.9	0	0	0	2	1230.5	842.9	0	0	0
6	Van Wyk ,L (Lara)	2	0.5	-212.5	0	0	0	2	0.5	-212.5	0	0	0
6	Van Wyk ,L (Lara)	2	1211.5	999	0	0	0	2	1219.2	999	0	0	0
7	Nel ,C (Carel)	1	1	425	1	1	425	0	0	0	0	0	0
7	Nel ,C (Carel)	1	1200	1625	1	1200	1625	0	0	0	0	0	0
8	Van Wyk ,J (Juan)	1	0	-425	1	0	-425	0	0	0	0	0	0
8	Van Wyk ,J (Juan)	1	1200	775	1	1200	775	0	0	0	0	0	0
9	Crafford ,Q (Quade)	1	0	-425	1	0	-425	0	0	0	0	0	0
9	Crafford ,Q (Quade)	1	1459	1034	1	1478.1	1034	0	0	0	0	0	0
10	Halitile ,O (Owothando)	1	1	425	1	1	425	0	0	0	0	0	0
10	Halitile ,O (Owothando)	1	1200	1625	1	1200	1625	0	0	0	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

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PLAYER PAGE

Personal

Jonker, W (William)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms