Chess South Africa Ratings Database

PLAYER PAGE

Personal

Coertzen, J (Janco)

Chess SA id

1100160139

FIDE id

Date of birth

2010-09-23 (U16)

Gender

Male

Region

Mangaung (FMB)

Citizen

RSA

Titles

Chess SA registered

Last active game

2024-05-05

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1212.3	1216.2	1214.3	1200
Raw rating	1212.3	1216.2	1214.3	1200
Weighted rating	1212	1215.1	1213.8	1200
Weighted performance	936.6	0	941.6	0
Floor	728.9	716.2	766.6	700
K-factor	36	36	36	36
Min/Max rating change allowed	162.9	162	162.5	165.8
Highest rating	1260.5 2024-02-01	1272.2 2024-05-01	1330.9 2024-02-01	1200 2018-10-01
Highest raw rating	1228.9 2024-03-01	1216.2 2024-06-01	1266.6 2024-03-01	1200 2024-03-01
Highest weighted rating	1211.7 2025-08-01	1213.8 2025-08-01	1266.6 2025-05-05	1200 2018-10-01
Highest weighted performance	1260.5 2024-02-01	1272.2 2024-05-01	1330.9 2024-02-01	1200 2024-03-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1212.3	1216.2	1214.3	1200
Analysis
Rating	1212.3	1216.2	1214.3	1200
Raw rating	1212.3	1216.2	1214.3	1200
Weighted rating	1212	1215.1	1213.8
Weighted performance	936.6	0	941.6
K-factor	36	36	36	36
Floor	728.9	716.2	766.6	700
Max/Min rating change allowed	162.9	162	162.5	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	1212.3	1216.2	1214.3	1200
New weighted rating	1212	1215.4	1213.7	1200
New weighted performance	929.8	0	934.6	0
Temp new rating	1212.3	1216.2	1214.3	1200
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1212.3	1216.2	1214.3	1200
New K-factor	36	36	36	36
New floor	728.9	716.2	766.6	700

Item	Main	Standard	Rapid
	0	0	0
	0	0	0
	25	5	20
	5	0	5
	0	0	0
	0	0	0
History	30	5	25

Games since
	Main 25	Standard 5		Rapid 20		Blitz 0
Gender	Male
Age group	U16
Region	Mangaung (FMB)
Province	Free State (FS)
Main
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U16	-1		-1		-1
U16 Male	-1		-1		-1
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U16	-1		-1		-1
U16 Male	-1		-1		-1
Rapid
	RSA		Province		Region
Overall	1569		43		41
Male	1211		37		35
U16	255		9		9
U16 Male	197		8		8
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U16	-1		-1		-1
U16 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	30	16	53.33	28.3	1221.3	1249.6
Standard	5	2	40	-85	1352.3	1267.3
Rapid	25	14	56	51	1195.1	1246.1
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-11-01	1212.3	1216.2	1214.3	1200
2025-09-30	1212.3	1216.2	1214.3	1200
2025-09-01	1212.3	1216.2	1214.3	1200
2025-08-01	1212.3	1216.2	1214.3	1200
2025-07-01	1212.3	1216.2	1214.3	1200
2025-06-01	1212.3	1216.2	1214.3	1200
2025-05-01	1212.3	1216.2	1214.3	1200
2025-04-01	1212.3	1216.2	1214.3	1200
2025-03-01	1212.3	1216.2	1214.2	1200
2025-02-01	1212.3	1216.2	1213.8	1200
2025-01-01	1212.3	1216.2	1210.4	1200
2024-12-01	1212.3	1216.2	1210.4	1200
2024-11-01	1212.3	1216.2	1210.4	1200
2024-10-01	1212.3	1216.2	1210.4	1200
2024-09-01	1212.3	1216.2	1210.4	1200
2024-08-01	1212.3	1216.2	1210.4	1200
2024-07-01	1212.3	1216.2	1210.4	1200
2024-09-01	1212.3	1216.2	1210.4	1200
2024-05-01	1199.2	1200	1210.4	1200
2024-04-01	1199.2	1200	1210.4	1200
2024-03-01	1228.9	1200	1266.6	1200
2024-02-01	1209	1200	1217.6	1200
2024-01-01	1209	1200	1217.6	1200
2023-12-01	1209	1200	1217.6	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	Spartan Bishops Chess Championships 2024 (Knights)	2024-05-04	2024-05-05	Standard	Bojanala Platina (NBR)	5	5	2	Yes	Analysis
2	Bloemfontein Highschool League 2024 (U15A)	2024-03-08	2024-03-08	Rapid	Mangaung (FMB)	5	5	3.5	Yes	Analysis
3	Mangaung Metro Chess 9 March 2024 (B)	2024-03-09	2024-03-09	Rapid	Mangaung (FMB)	5	5	1	Yes	Analysis
4	Mangaung Metro Chess 10 February 2024 (B)	2024-02-10	2024-02-10	Rapid	Mangaung (FMB)	5	5	2.5	Yes	Analysis
5	Bloemfontein High School League 16 February 2024 (U15A)	2024-02-16	2024-02-16	Rapid	Mangaung (FMB)	5	5	4	Yes	Analysis
6	August Primary School Chess Festival 2023 (Grade 6+7 A)	2023-08-04	2023-08-04	Rapid	Mangaung (FMB)	5	5	3	Yes	Analysis

#	Games	Start				End
1	7	Tournament Mangaung Metro Chess 10 February 2024				Tournament Bloemfontein High School League 16 February 2024
		date 2024-02-10	rnd 3	type Rapid	result 1	date 2024-02-16	rnd 4	type Rapid	result 1
		Opponent Van Rooyen, CG (Conrad Gerhard)				Opponent Monaheng, P (Poloko)
2	4	Tournament Bloemfontein Highschool League 2024				Tournament Bloemfontein Highschool League 2024
		date 2024-03-08	rnd 1	type Rapid	result 1	date 2024-03-08	rnd 4	type Rapid	result 1
		Opponent Fumba, B (Babalo)				Opponent Mitchell, T (Thomas)
3	2	Tournament Spartan Bishops Chess Championships 2024				Tournament Spartan Bishops Chess Championships 2024
		date 2024-05-04	rnd 3	type Standard	result 1	date 2024-05-04	rnd 4	type Standard	result 1
		Opponent Tladi, O (Ofentse)				Opponent Monare, O (Oratilwe)

#	Games	Start				End
1	2	Tournament Spartan Bishops Chess Championships 2024				Tournament Spartan Bishops Chess Championships 2024
		date 2024-05-04	rnd 3	type Standard	result 1	date 2024-05-04	rnd 4	type Standard	result 1
		Opponent Tladi, O (Ofentse)				Opponent Monare, O (Oratilwe)

#	Games	Start				End
1	7	Tournament Mangaung Metro Chess 10 February 2024				Tournament Bloemfontein High School League 16 February 2024
		date 2024-02-10	rnd 3	type Rapid	result 1	date 2024-02-16	rnd 4	type Rapid	result 1
		Opponent Van Rooyen, CG (Conrad Gerhard)				Opponent Monaheng, P (Poloko)
2	4	Tournament Bloemfontein Highschool League 2024				Tournament Bloemfontein Highschool League 2024
		date 2024-03-08	rnd 1	type Rapid	result 1	date 2024-03-08	rnd 4	type Rapid	result 1
		Opponent Fumba, B (Babalo)				Opponent Mitchell, T (Thomas)
3	2	Tournament August Primary School Chess Festival 2023				Tournament August Primary School Chess Festival 2023
		date 2023-08-04	rnd 1	type Rapid	result 1	date 2023-08-04	rnd 2	type Rapid	result 1
		Opponent De Gouveia, O (Oriana)				Opponent Streicher, C (Calla)

No games found.

#	Games	Start				End

#	Games	Start				End
1	4	Tournament Bloemfontein High School League 16 February 2024				Tournament Bloemfontein High School League 16 February 2024
		date 2024-02-16	rnd 1	type Rapid	result 1	date 2024-02-16	rnd 4	type Rapid	result 1
		Opponent Mokhachane, K (Kgalalelo)				Opponent Monaheng, P (Poloko)
2	2	Tournament Spartan Bishops Chess Championships 2024				Tournament Spartan Bishops Chess Championships 2024
		date 2024-05-04	rnd 3	type Standard	result 1	date 2024-05-04	rnd 4	type Standard	result 1
		Opponent Tladi, O (Ofentse)				Opponent Monare, O (Oratilwe)
3	2	Tournament Bloemfontein Highschool League 2024				Tournament Bloemfontein Highschool League 2024
		date 2024-03-08	rnd 3	type Rapid	result 1	date 2024-03-08	rnd 4	type Rapid	result 1
		Opponent Visser, M (Micayla)				Opponent Mitchell, T (Thomas)

#	Games	Start				End
1	2	Tournament Spartan Bishops Chess Championships 2024				Tournament Spartan Bishops Chess Championships 2024
		date 2024-05-04	rnd 3	type Standard	result 1	date 2024-05-04	rnd 4	type Standard	result 1
		Opponent Tladi, O (Ofentse)				Opponent Monare, O (Oratilwe)

#	Games	Start				End
1	4	Tournament Bloemfontein High School League 16 February 2024				Tournament Bloemfontein High School League 16 February 2024
		date 2024-02-16	rnd 1	type Rapid	result 1	date 2024-02-16	rnd 4	type Rapid	result 1
		Opponent Mokhachane, K (Kgalalelo)				Opponent Monaheng, P (Poloko)
2	2	Tournament Bloemfontein Highschool League 2024				Tournament Bloemfontein Highschool League 2024
		date 2024-03-08	rnd 3	type Rapid	result 1	date 2024-03-08	rnd 4	type Rapid	result 1
		Opponent Visser, M (Micayla)				Opponent Mitchell, T (Thomas)
3	2	Tournament Mangaung Metro Chess 10 February 2024				Tournament Mangaung Metro Chess 10 February 2024
		date 2024-02-10	rnd 3	type Rapid	result 1	date 2024-02-10	rnd 4	type Rapid	result 1
		Opponent Van Rooyen, CG (Conrad Gerhard)				Opponent Mohomed, E (Esa)

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	Mitchell ,T (Thomas)	2	1	0	0	0	0	2	1	0	0	0	0
1	Mitchell ,T (Thomas)	2	1262.5	1262.5	0	0	0	2	1299.8	1262.5	0	0	0
2	Mohomed ,E (Esa)	2	2	425	0	0	0	2	2	425	0	0	0
2	Mohomed ,E (Esa)	2	1200	1625	0	0	0	2	1200	1625	0	0	0
3	Tladi ,O (Ofentse)	1	1	425	1	1	425	0	0	0	0	0	0
3	Tladi ,O (Ofentse)	1	1200	1625	1	1200	1625	0	0	0	0	0	0
4	Monare ,O (Oratilwe)	1	1	425	1	1	425	0	0	0	0	0	0
4	Monare ,O (Oratilwe)	1	1232.6	1657.6	1	1226.2	1657.6	0	0	0	0	0	0
5	Gabaikangwe ,K (Kutlwano)	1	0	-425	1	0	-425	0	0	0	0	0	0
5	Gabaikangwe ,K (Kutlwano)	1	1329.1	904.1	1	1340.9	904.1	0	0	0	0	0	0
6	Changara ,A (Adiel Tavonga)	1	0	-425	1	0	-425	0	0	0	0	0	0
6	Changara ,A (Adiel Tavonga)	1	1462.4	1037.4	1	1466.3	1037.4	0	0	0	0	0	0
7	Tshetlhe ,B (Blessing)	1	0	-425	1	0	-425	0	0	0	0	0	0
7	Tshetlhe ,B (Blessing)	1	1537.4	1112.4	1	1544	1112.4	0	0	0	0	0	0
8	Ngowi ,L (Leo)	1	1	425	0	0	0	1	1	425	0	0	0
8	Ngowi ,L (Leo)	1	1105.3	1530.3	0	0	0	1	1140	1530.3	0	0	0
9	Melville ,J (Jason)	1	0	-425	0	0	0	1	0	-425	0	0	0
9	Melville ,J (Jason)	1	1300.8	875.8	0	0	0	1	1314	875.8	0	0	0
10	Streicher ,C (Calla)	1	1	425	0	0	0	1	1	425	0	0	0
10	Streicher ,C (Calla)	1	1321.7	1746.7	0	0	0	1	1213.2	1746.7	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

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PLAYER PAGE

Personal

Coertzen, J (Janco)

Ratings

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Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms