Chess South Africa Ratings Database

PLAYER PAGE

Personal

Chen, J (Jiajun)

Chess SA id

1140147323

FIDE id

Date of birth

2014-08-21 (U12)

Gender

Male

Region

Johannesburg Metro (GJM)

Citizen

RSA

Titles

Chess SA registered

Last active game

2024-02-17

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1278.7	1242.7	1284.6	1200
Raw rating	1278.7	1242.7	1284.6	1200
Weighted rating	1277.7	1242.7	1283.2	1200
Weighted performance	988.7	0	0	0
Floor	778.7	742.7	784.6	700
K-factor	36	36	36	36
Min/Max rating change allowed	148.2	156	147	165.8
Highest rating	1310.1 2022-10-01	1274.2 2023-07-01	1389.3 2022-10-01	1200 2018-10-01
Highest raw rating	1278.7 2024-03-01	1242.7 2024-02-01	1284.6 2024-03-01	1200 2024-02-01
Highest weighted rating	1276.5 2025-08-01	1242.7 2025-06-01	1281.7 2025-08-01	1200 2018-10-01
Highest weighted performance	1310.1 2022-10-01	1274.2 2023-07-01	1389.3 2022-10-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1278.7	1242.7	1284.6	1200
Analysis
Rating	1278.7	1242.7	1284.6	1200
Raw rating	1278.7	1242.7	1284.6	1200
Weighted rating	1277.7	1242.7	1283.2
Weighted performance	988.7	0	0
K-factor	36	36	36	36
Floor	778.7	742.7	784.6	700
Max/Min rating change allowed	148.2	156	147	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	1278.7	1242.7	1284.6	1200
New weighted rating	1278.1	1242.7	1283.8	1200
New weighted performance	988.3	0	0	0
Temp new rating	1278.7	1242.7	1284.6	1200
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1278.7	1242.7	1284.6	1200
New K-factor	36	36	36	36
New floor	778.7	742.7	784.6	700

Item	Main	Standard	Rapid
	0	0	0
	0	0	0
	5	0	5
	18	18	0
	5	0	5
	0	0	0
History	28	18	10

Games since
	Main 5	Standard 0		Rapid 5		Blitz 0
Gender	Male
Age group	U12
Region	Johannesburg Metro (GJM)
Province	Gauteng (GT)
Main
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U12	-1		-1		-1
U12 Male	-1		-1		-1
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U12	-1		-1		-1
U12 Male	-1		-1		-1
Rapid
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U12	-1		-1		-1
U12 Male	-1		-1		-1
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U12	-1		-1		-1
U12 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	28	17	60.71	91.1	1227.4	1318.5
Standard	18	9.5	52.78	23.6	1237.4	1261
Rapid	10	7.5	75	212.5	1209.3	1421.8
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-09-30	1278.7	1242.7	1284.6	1200
2025-09-01	1278.7	1242.7	1284.6	1200
2025-08-01	1278.7	1242.7	1284.6	1200
2025-07-01	1278.7	1242.7	1284.6	1200
2025-06-01	1278.7	1242.7	1284.6	1200
2025-05-01	1278.7	1242.7	1284.6	1200
2025-04-01	1278.7	1242.7	1284.6	1200
2025-03-01	1278.7	1242.7	1284.6	1200
2025-02-01	1278.7	1242.7	1284.6	1200
2025-01-01	1278.7	1242.7	1284.6	1200
2024-12-01	1278.7	1242.7	1284.6	1200
2024-11-01	1278.7	1242.7	1284.6	1200
2024-10-01	1278.7	1242.7	1284.6	1200
2024-09-01	1278.7	1242.7	1284.6	1200
2024-08-01	1278.7	1242.7	1284.6	1200
2024-07-01	1278.7	1242.7	1284.6	1200
2024-06-01	1278.7	1242.7	1284.6	1200
2024-08-01	1278.7	1242.7	1284.6	1200
2024-04-01	1278.7	1242.7	1284.6	1200
2024-03-01	1278.7	1242.7	1284.6	1200
2024-02-01	1247.8	1242.7	1243.6	1200
2024-01-01	1247.8	1242.7	1243.6	1200
2023-12-01	1247.8	1242.7	1243.6	1200
2023-11-01	1247.8	1242.7	1243.6	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	Gear Up Mzansi Rapid 2024 (Junior)	2024-02-17	2024-02-17	Rapid	Johannesburg Metro (GJM)	5	5	4	Yes	Analysis
2	GoForChess Junior Chess Championship Grayston 2023 (Juniors)	2023-07-16	2023-07-16	Standard	Johannesburg Metro (GJM)	5	5	3	Yes	Analysis
3	3rd Knight Riders Junior Open 2023 (U10+U12)	2023-07-29	2023-07-29	Standard	Johannesburg Metro (GJM)	5	5	3	Yes	Analysis
4	ThinkChess Tournament 6 May 2023	2023-05-06	2023-05-06	Standard	Johannesburg Metro (GJM)	5	5	2.5	Yes	Analysis
5	JNW Open - Crawford 2023 (U10)	2023-03-04	2023-03-04	Standard	Johannesburg Metro (GJM)	5	3	1	Yes	Analysis
6	Chess Power House Rapid 2022 (U8)	2022-10-22	2022-10-22	Rapid	Johannesburg Metro (GJM)	5	5	3.5	Yes	Analysis

#	Games	Start				End
1	4	Tournament 3rd Knight Riders Junior Open 2023				Tournament Gear Up Mzansi Rapid 2024
		date 2023-07-29	rnd 5	type Standard	result 1	date 2024-02-17	rnd 3	type Rapid	result 1
		Opponent Dlamini, A (Asanda)				Opponent Wang, H (Henry)
2	4	Tournament Chess Power House Rapid 2022				Tournament JNW Open - Crawford 2023
		date 2022-10-22	rnd 3	type Rapid	result 1	date 2023-03-04	rnd 2	type Standard	result 1
		Opponent Linnell, H (Hannah)				Opponent Saaiman, N (Nicolaas)
3	2	Tournament 3rd Knight Riders Junior Open 2023				Tournament 3rd Knight Riders Junior Open 2023
		date 2023-07-29	rnd 2	type Standard	result 1	date 2023-07-29	rnd 3	type Standard	result 1
		Opponent Chauke, N (Nokukhanya)				Opponent Collard, L (Liam)

#	Games	Start				End
1	2	Tournament 3rd Knight Riders Junior Open 2023				Tournament 3rd Knight Riders Junior Open 2023
		date 2023-07-29	rnd 2	type Standard	result 1	date 2023-07-29	rnd 3	type Standard	result 1
		Opponent Chauke, N (Nokukhanya)				Opponent Collard, L (Liam)
2	2	Tournament GoForChess Junior Chess Championship Grayston 2023				Tournament GoForChess Junior Chess Championship Grayston 2023
		date 2023-07-16	rnd 1	type Standard	result 1	date 2023-07-16	rnd 2	type Standard	result 1
		Opponent Mannar, A (Aaryan)				Opponent Wu, J (Jayden)
3	2	Tournament ThinkChess Tournament 6 May 2023				Tournament ThinkChess Tournament 6 May 2023
		date 2023-05-06	rnd 1	type Standard	result 1	date 2023-05-06	rnd 2	type Standard	result 1
		Opponent Upadhyay, S (Savya)				Opponent Pretorius, K (Klarissa)

#	Games	Start				End
1	6	Tournament Chess Power House Rapid 2022				Tournament Gear Up Mzansi Rapid 2024
		date 2022-10-22	rnd 3	type Rapid	result 1	date 2024-02-17	rnd 3	type Rapid	result 1
		Opponent Linnell, H (Hannah)				Opponent Wang, H (Henry)
2	1	Tournament Gear Up Mzansi Rapid 2024				Tournament Gear Up Mzansi Rapid 2024
		date 2024-02-17	rnd 5	type Rapid	result 1	date 2024-02-17	rnd 5	type Rapid	result 1
		Opponent Hattingh, A (Andre)				Opponent Hattingh, A (Andre)
3	1	Tournament Chess Power House Rapid 2022				Tournament Chess Power House Rapid 2022
		date 2022-10-22	rnd 1	type Rapid	result 1	date 2022-10-22	rnd 1	type Rapid	result 1
		Opponent Stelloh, A (Alexander)				Opponent Stelloh, A (Alexander)

No games found.

#	Games	Start				End

#	Games	Start				End
1	4	Tournament 3rd Knight Riders Junior Open 2023				Tournament Gear Up Mzansi Rapid 2024
		date 2023-07-29	rnd 5	type Standard	result 1	date 2024-02-17	rnd 3	type Rapid	result 1
		Opponent Dlamini, A (Asanda)				Opponent Wang, H (Henry)
2	2	Tournament 3rd Knight Riders Junior Open 2023				Tournament 3rd Knight Riders Junior Open 2023
		date 2023-07-29	rnd 2	type Standard	result 1	date 2023-07-29	rnd 3	type Standard	result 1
		Opponent Chauke, N (Nokukhanya)				Opponent Collard, L (Liam)
3	2	Tournament GoForChess Junior Chess Championship Grayston 2023				Tournament GoForChess Junior Chess Championship Grayston 2023
		date 2023-07-16	rnd 1	type Standard	result 1	date 2023-07-16	rnd 2	type Standard	result 1
		Opponent Mannar, A (Aaryan)				Opponent Wu, J (Jayden)

#	Games	Start				End
1	2	Tournament 3rd Knight Riders Junior Open 2023				Tournament 3rd Knight Riders Junior Open 2023
		date 2023-07-29	rnd 2	type Standard	result 1	date 2023-07-29	rnd 3	type Standard	result 1
		Opponent Chauke, N (Nokukhanya)				Opponent Collard, L (Liam)
2	2	Tournament GoForChess Junior Chess Championship Grayston 2023				Tournament GoForChess Junior Chess Championship Grayston 2023
		date 2023-07-16	rnd 1	type Standard	result 1	date 2023-07-16	rnd 2	type Standard	result 1
		Opponent Mannar, A (Aaryan)				Opponent Wu, J (Jayden)
3	2	Tournament ThinkChess Tournament 6 May 2023				Tournament ThinkChess Tournament 6 May 2023
		date 2023-05-06	rnd 1	type Standard	result 1	date 2023-05-06	rnd 2	type Standard	result 1
		Opponent Upadhyay, S (Savya)				Opponent Pretorius, K (Klarissa)

#	Games	Start				End
1	4	Tournament Chess Power House Rapid 2022				Tournament Gear Up Mzansi Rapid 2024
		date 2022-10-22	rnd 5	type Rapid	result 1	date 2024-02-17	rnd 3	type Rapid	result 1
		Opponent Robinson, Z (Zachariah)				Opponent Wang, H (Henry)
2	1	Tournament Gear Up Mzansi Rapid 2024				Tournament Gear Up Mzansi Rapid 2024
		date 2024-02-17	rnd 5	type Rapid	result 1	date 2024-02-17	rnd 5	type Rapid	result 1
		Opponent Hattingh, A (Andre)				Opponent Hattingh, A (Andre)
3	1	Tournament Chess Power House Rapid 2022				Tournament Chess Power House Rapid 2022
		date 2022-10-22	rnd 3	type Rapid	result 1	date 2022-10-22	rnd 3	type Rapid	result 1
		Opponent Linnell, H (Hannah)				Opponent Linnell, H (Hannah)

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	Collard ,L (Liam)	1	1	425	1	1	425	0	0	0	0	0	0
1	Collard ,L (Liam)	1	1200	1625	1	1200	1625	0	0	0	0	0	0
2	Nathan ,A (Amira)	1	0	-425	1	0	-425	0	0	0	0	0	0
2	Nathan ,A (Amira)	1	1200	775	1	1200	775	0	0	0	0	0	0
3	Horn ,E (Evan)	1	0	-425	1	0	-425	0	0	0	0	0	0
3	Horn ,E (Evan)	1	1207	782	1	1203.6	782	0	0	0	0	0	0
4	Mannar ,A (Aaryan)	1	1	425	1	1	425	0	0	0	0	0	0
4	Mannar ,A (Aaryan)	1	1322.8	1747.8	1	1319.7	1747.8	0	0	0	0	0	0
5	Pretorius ,K (Klarissa)	1	1	425	1	1	425	0	0	0	0	0	0
5	Pretorius ,K (Klarissa)	1	1234.9	1659.9	1	1225.5	1659.9	0	0	0	0	0	0
6	Saaiman ,N (Nicolaas)	1	1	425	1	1	425	0	0	0	0	0	0
6	Saaiman ,N (Nicolaas)	1	1200	1625	1	1200	1625	0	0	0	0	0	0
7	Upadhyay ,S (Savya)	1	1	425	1	1	425	0	0	0	0	0	0
7	Upadhyay ,S (Savya)	1	1354	1779	1	1349.3	1779	0	0	0	0	0	0
8	Jacobs ,L (Lillith)	1	0	-425	1	0	-425	0	0	0	0	0	0
8	Jacobs ,L (Lillith)	1	1398.4	973.4	1	1391.3	973.4	0	0	0	0	0	0
9	Weng ,D (Daniel)	1	0	-425	1	0	-425	0	0	0	0	0	0
9	Weng ,D (Daniel)	1	1424.5	999.5	1	1409.3	999.5	0	0	0	0	0	0
10	Wu ,J (Jayden)	1	1	425	1	1	425	0	0	0	0	0	0
10	Wu ,J (Jayden)	1	1167.1	1592.1	1	1159.2	1592.1	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

Chen, J (Jiajun)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms