Chess South Africa Ratings Database

PLAYER PAGE

Personal

Jonkers, C (Cyrus)

Chess SA id

1130309964

FIDE id

Date of birth

2013-09-27 (U14)

Gender

Male

Region

Cape Winelands (WCW)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-09-20

Personal details last changed

1900-01-01

Junior GPX Games

14.8

Junior GPX Points

1189.3

Item	Main	Standard	Rapid	Blitz
Rating	1268.7	1261.9	1239.1	1200
Raw rating	1268.7	1261.9	1239.1	1200
Weighted rating	1239.4	1231.6	1223.4	1200
Weighted performance	1210.6	0	0	0
Floor	787.8	761.9	767.9	700
K-factor	36	36	36	36
Min/Max rating change allowed	150.4	151.8	156.8	165.8
Highest rating	1287.8 2025-09-01	1261.9 2025-04-01	1310.5 2024-08-01	1200 2024-10-01
Highest raw rating	1287.8 2025-09-01	1261.9 2025-04-01	1267.9 2025-09-01	1200 2024-10-01
Highest weighted rating	1239.4 2025-09-30	1224.1 2025-08-01	1223.4 2025-09-30	1200 2024-10-01
Highest weighted performance	1236.4 2024-08-01	1200 2024-10-01	1310.5 2024-08-01	1200 2024-10-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1268.7	1261.9	1239.1	1200
Analysis
Rating	1268.7	1261.9	1239.1	1200
Raw rating	1268.7	1261.9	1239.1	1200
Weighted rating	1239.4	1231.6	1223.4
Weighted performance	1210.6	0	0
K-factor	36	36	36	36
Floor	787.8	761.9	767.9	700
Max/Min rating change allowed	150.4	151.8	156.8	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	1268.7	1261.9	1239.1	1200
New weighted rating	1242.9	1235	1225.2	1200
New weighted performance	1210.2	0	0	0
Temp new rating	1268.7	1261.9	1239.1	1200
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1268.7	1261.9	1239.1	1200
New K-factor	36	36	36	36
New floor	787.8	761.9	767.9	700

Item	Main	Standard	Rapid
	0	0	0
	20	10	10
	5	0	5
	0	0	0
	0	0	0
	0	0	0
History	25	10	15

Games since
	Main 25	Standard 10		Rapid 15		Blitz 0
Gender	Male
Age group	U14
Region	Cape Winelands (WCW)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U14	-1		-1		-1
U14 Male	-1		-1		-1
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U14	-1		-1		-1
U14 Male	-1		-1		-1
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	12	60	85	1240.2	1325.2
Standard	10	6	60	85	1284.2	1369.2
Rapid	10	6	60	85	1196.2	1281.2
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	25	15	60	85	1234	1319
Standard	10	6	60	85	1284.2	1369.2
Rapid	15	9	60	85	1200.6	1285.6
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-09-30	1268.7	1261.9	1239.1	1200
2025-09-01	1287.8	1261.9	1267.9	1200
2025-08-01	1266.3	1261.9	1222.8	1200
2025-07-01	1266.3	1261.9	1222.8	1200
2025-06-01	1266.3	1261.9	1222.8	1200
2025-05-01	1266.3	1261.9	1222.8	1200
2025-04-01	1266.3	1261.9	1222.8	1200
2025-03-01	1231.4	1222.2	1222.8	1200
2025-02-01	1212.2	1200	1222.8	1200
2025-01-01	1212.2	1200	1222.8	1200
2024-12-01	1212.2	1200	1222.8	1200
2024-11-01	1212.2	1200	1222.8	1200
2024-10-01	1212.2	1200	1222.8	1200
2024-09-01	1212.2	1200	1222.8	1200
2024-08-01	1200	1200	1200	1200
2024-07-01	1200	1200	1200	1200
2024-06-01	1200	1200	1200	1200
2024-08-01	1200	1200	1200	1200
2024-04-01	1200	1200	1200	1200
2024-03-01	1200	1200	1200	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	Rhenish Primary 2025 (U14+Over)	2025-09-20	2025-09-20	Rapid	Cape Winelands (WCW)	5	5	2	Yes	Analysis
2	Stellenbosch Primary 2025 (U13)	2025-08-16	2025-08-16	Rapid	Cape Winelands (WCW)	5	5	4	Yes	Analysis
3	Cape Winelands Schools Prestige 2025 (U13 Boys)	2025-03-08	2025-03-08	Standard	Cape Winelands (WCW)	5	5	3	Yes	Analysis
4	Cape Winelands Schools - Trials 1 2025 (U13 Boys)	2025-02-22	2025-02-22	Standard	Cape Winelands (WCW)	5	5	3	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Rhenish Primary 2025 (U14+Over)	2025-09-20	2025-09-20	Rapid	Cape Winelands (WCW)	5	5	2	Yes	Analysis
2	Stellenbosch Primary 2025 (U13)	2025-08-16	2025-08-16	Rapid	Cape Winelands (WCW)	5	5	4	Yes	Analysis
3	Cape Winelands Schools Prestige 2025 (U13 Boys)	2025-03-08	2025-03-08	Standard	Cape Winelands (WCW)	5	5	3	Yes	Analysis
4	Cape Winelands Schools - Trials 1 2025 (U13 Boys)	2025-02-22	2025-02-22	Standard	Cape Winelands (WCW)	5	5	3	Yes	Analysis
5	Stellenbosch Primary 2024 (U11)	2024-08-17	2024-08-17	Rapid	Cape Winelands (WCW)	5	5	3	Yes	Analysis

#	Games	Start				End
1	5	Tournament Stellenbosch Primary 2025				Tournament Rhenish Primary 2025
		date 2025-08-16	rnd 2	type Rapid	result 1	date 2025-09-20	rnd 1	type Rapid	result 1
		Opponent Barnard, J (Jamie)				Opponent Abrahams, N (Nahum)
2	3	Tournament Cape Winelands Schools Prestige 2025				Tournament Cape Winelands Schools Prestige 2025
		date 2025-03-08	rnd 2	type Standard	result 1	date 2025-03-08	rnd 4	type Standard	result 1
		Opponent Grill, E (Eli)				Opponent Filander, E (Elijah)
3	2	Tournament Cape Winelands Schools - Trials 1 2025				Tournament Cape Winelands Schools - Trials 1 2025
		date 2025-02-22	rnd 1	type Standard	result 1	date 2025-02-22	rnd 2	type Standard	result 1
		Opponent Germenis, M (Markos)				Opponent van der Merwe, S (Stefan)

#	Games	Start				End
1	3	Tournament Cape Winelands Schools Prestige 2025				Tournament Cape Winelands Schools Prestige 2025
		date 2025-03-08	rnd 2	type Standard	result 1	date 2025-03-08	rnd 4	type Standard	result 1
		Opponent Grill, E (Eli)				Opponent Filander, E (Elijah)
2	2	Tournament Cape Winelands Schools - Trials 1 2025				Tournament Cape Winelands Schools - Trials 1 2025
		date 2025-02-22	rnd 1	type Standard	result 1	date 2025-02-22	rnd 2	type Standard	result 1
		Opponent Germenis, M (Markos)				Opponent van der Merwe, S (Stefan)
3	1	Tournament Cape Winelands Schools - Trials 1 2025				Tournament Cape Winelands Schools - Trials 1 2025
		date 2025-02-22	rnd 5	type Standard	result 1	date 2025-02-22	rnd 5	type Standard	result 1
		Opponent De Vries, L (Linder)				Opponent De Vries, L (Linder)

#	Games	Start				End
1	5	Tournament Stellenbosch Primary 2025				Tournament Rhenish Primary 2025
		date 2025-08-16	rnd 2	type Rapid	result 1	date 2025-09-20	rnd 1	type Rapid	result 1
		Opponent Barnard, J (Jamie)				Opponent Abrahams, N (Nahum)
2	2	Tournament Stellenbosch Primary 2024				Tournament Stellenbosch Primary 2024
		date 2024-08-17	rnd 3	type Rapid	result 1	date 2024-08-17	rnd 4	type Rapid	result 1
		Opponent Erens, L (Luke)				Opponent Janse Van Rensburg, T (Tj)
3	1	Tournament Rhenish Primary 2025				Tournament Rhenish Primary 2025
		date 2025-09-20	rnd 3	type Rapid	result 1	date 2025-09-20	rnd 3	type Rapid	result 1
		Opponent Jumat, M (Mj)				Opponent Jumat, M (Mj)

No games found.

#	Games	Start				End

#	Games	Start				End
1	5	Tournament Stellenbosch Primary 2025				Tournament Rhenish Primary 2025
		date 2025-08-16	rnd 2	type Rapid	result 1	date 2025-09-20	rnd 1	type Rapid	result 1
		Opponent Barnard, J (Jamie)				Opponent Abrahams, N (Nahum)
2	3	Tournament Cape Winelands Schools Prestige 2025				Tournament Cape Winelands Schools Prestige 2025
		date 2025-03-08	rnd 2	type Standard	result 1	date 2025-03-08	rnd 4	type Standard	result 1
		Opponent Grill, E (Eli)				Opponent Filander, E (Elijah)
3	2	Tournament Cape Winelands Schools - Trials 1 2025				Tournament Cape Winelands Schools - Trials 1 2025
		date 2025-02-22	rnd 1	type Standard	result 1	date 2025-02-22	rnd 2	type Standard	result 1
		Opponent Germenis, M (Markos)				Opponent van der Merwe, S (Stefan)

#	Games	Start				End
1	3	Tournament Cape Winelands Schools Prestige 2025				Tournament Cape Winelands Schools Prestige 2025
		date 2025-03-08	rnd 2	type Standard	result 1	date 2025-03-08	rnd 4	type Standard	result 1
		Opponent Grill, E (Eli)				Opponent Filander, E (Elijah)
2	2	Tournament Cape Winelands Schools - Trials 1 2025				Tournament Cape Winelands Schools - Trials 1 2025
		date 2025-02-22	rnd 1	type Standard	result 1	date 2025-02-22	rnd 2	type Standard	result 1
		Opponent Germenis, M (Markos)				Opponent van der Merwe, S (Stefan)
3	1	Tournament Cape Winelands Schools - Trials 1 2025				Tournament Cape Winelands Schools - Trials 1 2025
		date 2025-02-22	rnd 5	type Standard	result 1	date 2025-02-22	rnd 5	type Standard	result 1
		Opponent De Vries, L (Linder)				Opponent De Vries, L (Linder)

#	Games	Start				End
1	5	Tournament Stellenbosch Primary 2025				Tournament Rhenish Primary 2025
		date 2025-08-16	rnd 2	type Rapid	result 1	date 2025-09-20	rnd 1	type Rapid	result 1
		Opponent Barnard, J (Jamie)				Opponent Abrahams, N (Nahum)
2	2	Tournament Stellenbosch Primary 2024				Tournament Stellenbosch Primary 2024
		date 2024-08-17	rnd 3	type Rapid	result 1	date 2024-08-17	rnd 4	type Rapid	result 1
		Opponent Erens, L (Luke)				Opponent Janse Van Rensburg, T (Tj)
3	1	Tournament Rhenish Primary 2025				Tournament Rhenish Primary 2025
		date 2025-09-20	rnd 3	type Rapid	result 1	date 2025-09-20	rnd 3	type Rapid	result 1
		Opponent Jumat, M (Mj)				Opponent Jumat, M (Mj)

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	Goosen ,C (Chris)	1	1	425	1	1	425	0	0	0	0	0	0
1	Goosen ,C (Chris)	1	1304.9	1729.9	1	1306.2	1729.9	0	0	0	0	0	0
2	Germenis ,M (Markos)	1	1	425	1	1	425	0	0	0	0	0	0
2	Germenis ,M (Markos)	1	1200	1625	1	1200	1625	0	0	0	0	0	0
3	Amsterdam ,J (Jodan)	1	0	-425	1	0	-425	0	0	0	0	0	0
3	Amsterdam ,J (Jodan)	1	1346.2	921.2	1	1322.9	921.2	0	0	0	0	0	0
4	Grill ,E (Eli)	1	1	425	1	1	425	0	0	0	0	0	0
4	Grill ,E (Eli)	1	1218.9	1643.9	1	1218.7	1643.9	0	0	0	0	0	0
5	Julies ,D (Daniel)	1	0	-425	1	0	-425	0	0	0	0	0	0
5	Julies ,D (Daniel)	1	1200	775	1	1200	775	0	0	0	0	0	0
6	Els ,J (Josua)	1	0	-425	1	0	-425	0	0	0	0	0	0
6	Els ,J (Josua)	1	1387.6	962.6	1	1264	962.6	0	0	0	0	0	0
7	van der Merwe ,S (Stefan)	1	1	425	1	1	425	0	0	0	0	0	0
7	van der Merwe ,S (Stefan)	1	1200	1625	1	1200	1625	0	0	0	0	0	0
8	Filander ,E (Elijah)	1	1	425	1	1	425	0	0	0	0	0	0
8	Filander ,E (Elijah)	1	1337.2	1762.2	1	1309.6	1762.2	0	0	0	0	0	0
9	De Vries ,L (Linder)	1	1	425	1	1	425	0	0	0	0	0	0
9	De Vries ,L (Linder)	1	1159.6	1584.6	1	1200	1584.6	0	0	0	0	0	0
10	Kuypers ,P (Parker)	1	0	-425	1	0	-425	0	0	0	0	0	0
10	Kuypers ,P (Parker)	1	1487.8	1062.8	1	1436.7	1062.8	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

Jonkers, C (Cyrus)

Ratings

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Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms