Chess South Africa Ratings Database

PLAYER PAGE

Personal

Mostert, J (Jan-Abraham)

Chess SA id

104025229

FIDE id

Date of birth

2004-03-26 (Adult)

Gender

Male

Region

Eden (WEG)

Citizen

RSA

Titles

Chess SA registered

Last active game

2020-03-15

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1278.6	1272.5	1074	1074
Raw rating	1278.6	1272.5	1074	1074
Weighted rating	1278.6	1272.5	1074	1074
Weighted performance	387.9	386	0	0
Floor	819.5	813.5	574	574
K-factor	36	36	40	40
Min/Max rating change allowed	148.2	149.5	198.4	198.4
Highest rating	1333.8 2019-07-01	1326.9 2019-07-01	1200 2024-03-01	1200 2024-03-01
Highest raw rating	1319.5 2019-12-01	1313.5 2019-12-01	1074 2024-03-01	1074 2024-03-01
Highest weighted rating	1319.5 2025-02-01	1313.5 2025-02-01	1074 2024-11-01	1074 2024-11-01
Highest weighted performance	1333.8 2019-07-01	1326.9 2019-07-01	1200 2024-03-01	1200 2024-03-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1278.6	1272.5	1074	1074
Analysis
Rating	1278.6	1272.5	1074	1074
Raw rating	1278.6	1272.5	1074	1074
Weighted rating	1278.6	1272.5	1074
Weighted performance	387.9	386	0
K-factor	36	36	40	40
Floor	819.5	813.5	574	574
Max/Min rating change allowed	148.2	149.5	198.4	198.4
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	1278.6	1272.5	1074	1074
New weighted rating	1278.6	1272.5	1074	1074
New weighted performance	387.5	385.6	0	0
Temp new rating	1278.6	1272.5	1074	1074
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1278.6	1272.5	1074	1074
New K-factor	36	36	40	40
New floor	819.5	813.5	574	574

Item	Main	Standard	Rapid
	0	0	0
	0	0	0
	0	0	0
	0	0	0
	0	0	0
	0	0	0
History	379	326	53

Games since
	Main 0	Standard 0		Rapid 0		Blitz 0
Gender	Male
Age group	Adult
Region	Eden (WEG)
Province	Western Cape (WC)
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	116	72.5	62.5	106.2	1125.8	1232
Standard	116	72.5	62.5	106.2	1125.8	1232
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-09-30	1278.6	1272.5	1074	1074
2025-09-01	1278.6	1272.5	1074	1074
2025-08-01	1278.6	1272.5	1074	1074
2025-07-01	1278.6	1272.5	1074	1074
2025-06-01	1278.6	1272.5	1074	1074
2025-05-01	1278.6	1272.5	1074	1074
2025-04-01	1278.6	1272.5	1074	1074
2025-03-01	1278.6	1272.5	1074	1074
2025-02-01	1278.6	1272.5	1074	1074
2025-01-01	1278.6	1272.5	1074	1074
2024-12-01	1278.6	1272.5	1074	1074
2024-11-01	1278.6	1272.5	1074	1074
2024-10-01	1278.6	1272.5	1074	1074
2024-09-01	1278.6	1272.5	1074	1074
2024-08-01	1278.6	1272.5	1074	1074
2024-07-01	1278.6	1272.5	1074	1074
2024-06-01	1278.6	1272.5	1074	1074
2024-08-01	1278.6	1272.5	1074	1074
2024-04-01	1278.6	1272.5	1074	1074
2024-03-01	1278.6	1272.5	1074	1074
2024-02-01	1278.6	1272.5	1074	1074
2024-01-01	1278.6	1272.5	1074	1074
2023-12-01	1278.6	1272.5	1074	1074
2023-11-01	1278.6	1272.5	1074	1074

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	Western Cape Schools 2020 (U18 Boys)	2020-03-14	2020-03-15	Standard	Cape Town (WCT)	5	4	1	Yes	Analysis
2	Eden Schools Closed Trials 1 2020 (U18 Boys)	2020-03-07	2020-03-07	Standard	Eden (WEG)	5	5	4.5	Yes	Analysis
3	George Trial 2 2020 (U18+U20)	2020-02-08	2020-02-08	Standard	Eden (WEG)	5	4	2.5	Yes	Analysis
4	George Trial 1 2020 (U18+U20)	2020-01-25	2020-01-25	Standard	Eden (WEG)	5	5	3	Yes	Analysis
5	2019 South African Junior Team Championships (U16B)	2020-01-04	2020-01-08	Standard	4 Knights (4K)	7	7	1	Yes	Analysis
6	George Open Chess Tournament 2019 (B)	2019-11-30	2019-12-01	Standard	Eden (WEG)	6	5	1	Yes	Analysis
7	Eden Top Schools 2019 (U15)	2019-07-20	2019-07-20	Standard	Eden (WEG)	5	5	4	Yes	Analysis
8	Eden Trials 3 2019 (U16 Open)	2019-05-11	2019-05-11	Standard	Eden (WEG)	5	5	3.5	Yes	Analysis
9	Western Cape Schools Individuals 2019 (U15 Boys)	2019-05-04	2019-05-05	Standard	Eden (WEG)	6	6	3	Yes	Analysis
10	Eden Trials 2 2019 (U16 Open)	2019-04-13	2019-04-13	Standard	Eden (WEG)	5	5	4	Yes	Analysis
11	Eden Trials 1 2019 (U16 Open)	2019-03-02	2019-03-02	Standard	Eden (WEG)	5	5	4	Yes	Analysis
12	George Trials 2 2019 (U16)	2019-02-09	2019-02-09	Standard	Eden (WEG)	5	5	4	Yes	Analysis
13	George Trials 1 2019 (U16)	2019-01-26	2019-01-26	Standard	Eden (WEG)	5	5	4	Yes	Analysis
14	South African Junior Team Championships 2018 (U16A)	2018-12-16	2018-12-20	Standard	4 Knights (4K)	7	7	1	Yes	Analysis
15	Western Cape Top Schools 2018 (U15 Mix)	2018-08-25	2018-08-26	Standard	Overberg (WOS)	5	5	4	Yes	Analysis
16	EDENSC Closed 3 2018 (U16 Open)	2018-05-12	2018-05-12	Standard	Eden (WEG)	5	5	2.5	Yes	Analysis
17	Western Cape Schools Individuals 2018 (U15 Boys)	2018-05-19	2018-05-20	Standard	Overberg (WOS)	6	6	3.5	Yes	Analysis
18	EDENSC Closed 2 2018 (U16 Open)	2018-04-14	2018-04-14	Standard	Eden (WEG)	5	5	4	Yes	Analysis
19	EDENSC Closed 1 2018 (U16 Boys)	2018-03-10	2018-03-10	Standard	Eden (WEG)	5	5	3.5	Yes	Analysis
20	George Trails 2 2018 (U16)	2018-02-10	2018-02-10	Standard	Eden (WEG)	5	5	4.5	Yes	Analysis
21	George Trails 1 2018 (U16)	2018-01-27	2018-01-27	Standard	Eden (WEG)	5	5	4	Yes	Analysis
22	South African Junior Team Championships 2017 (U14B)	2018-01-04	2018-01-08	Standard	4 Knights (4K)	7	7	6	Yes	Analysis

#	Games	Start				End
1	10	Tournament George Trails 1 2018				Tournament EDENSC Closed 1 2018
		date 2018-01-27	rnd 5	type Standard	result 1	date 2018-03-10	rnd 4	type Standard	result 1
		Opponent Muller, J (Janke)				Opponent Plaatjies, S (Sherwin)
2	8	Tournament George Trial 2 2020				Tournament Eden Schools Closed Trials 1 2020
		date 2020-02-08	rnd 3	type Standard	result 0.5	date 2020-03-07	rnd 5	type Standard	result 1
		Opponent Kirk, MM (Matthew Michael)				Opponent Fourie, C (Corne)
3	8	Tournament George Trials 2 2019				Tournament Eden Trials 1 2019
		date 2019-02-09	rnd 1	type Standard	result 1	date 2019-03-02	rnd 3	type Standard	result 1
		Opponent Van Loggerenberg, P (Pierre)				Opponent Pondo, B (Brandon-Lee)

#	Games	Start				End
1	10	Tournament George Trails 1 2018				Tournament EDENSC Closed 1 2018
		date 2018-01-27	rnd 5	type Standard	result 1	date 2018-03-10	rnd 4	type Standard	result 1
		Opponent Muller, J (Janke)				Opponent Plaatjies, S (Sherwin)
2	8	Tournament George Trial 2 2020				Tournament Eden Schools Closed Trials 1 2020
		date 2020-02-08	rnd 3	type Standard	result 0.5	date 2020-03-07	rnd 5	type Standard	result 1
		Opponent Kirk, MM (Matthew Michael)				Opponent Fourie, C (Corne)
3	8	Tournament George Trials 2 2019				Tournament Eden Trials 1 2019
		date 2019-02-09	rnd 1	type Standard	result 1	date 2019-03-02	rnd 3	type Standard	result 1
		Opponent Van Loggerenberg, P (Pierre)				Opponent Pondo, B (Brandon-Lee)

No games found.

#	Games	Start				End

No games found.

#	Games	Start				End

#	Games	Start				End
1	6	Tournament South African Junior Team Championships 2017				Tournament George Trails 1 2018
		date 2018-01-06	rnd 5	type Standard	result 1	date 2018-01-27	rnd 3	type Standard	result 1
		Opponent Semenya, K (Kgaugelo)				Opponent Barnard, S (Stephan)
2	5	Tournament George Trails 1 2018				Tournament George Trails 2 2018
		date 2018-01-27	rnd 5	type Standard	result 1	date 2018-02-10	rnd 4	type Standard	result 1
		Opponent Muller, J (Janke)				Opponent Odendaal, J (Juan)
3	4	Tournament George Trial 2 2020				Tournament Eden Schools Closed Trials 1 2020
		date 2020-02-08	rnd 4	type Standard	result 1	date 2020-03-07	rnd 2	type Standard	result 1
		Opponent Hannies, D (Deacon)				Opponent Murphy, S (Sidwell)

#	Games	Start				End
1	6	Tournament South African Junior Team Championships 2017				Tournament George Trails 1 2018
		date 2018-01-06	rnd 5	type Standard	result 1	date 2018-01-27	rnd 3	type Standard	result 1
		Opponent Semenya, K (Kgaugelo)				Opponent Barnard, S (Stephan)
2	5	Tournament George Trails 1 2018				Tournament George Trails 2 2018
		date 2018-01-27	rnd 5	type Standard	result 1	date 2018-02-10	rnd 4	type Standard	result 1
		Opponent Muller, J (Janke)				Opponent Odendaal, J (Juan)
3	4	Tournament George Trial 2 2020				Tournament Eden Schools Closed Trials 1 2020
		date 2020-02-08	rnd 4	type Standard	result 1	date 2020-03-07	rnd 2	type Standard	result 1
		Opponent Hannies, D (Deacon)				Opponent Murphy, S (Sidwell)

No games found.

#	Games	Start				End

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	Stuurman ,L (Luciano)	3	1	-141.7	3	1	-141.7	0	0	0	0	0	0
1	Stuurman ,L (Luciano)	3	1129.9	988.3	3	1141	988.3	0	0	0	0	0	0
2	Fourie ,C (Corne)	3	1.5	0	3	1.5	0	0	0	0	0	0	0
2	Fourie ,C (Corne)	3	1301.3	1301.3	3	1301.1	1301.3	0	0	0	0	0	0
3	Campbell ,G (Grant)	3	0	-425	3	0	-425	0	0	0	0	0	0
3	Campbell ,G (Grant)	3	1363.9	938.9	3	1388.7	938.9	0	0	0	0	0	0
4	Van Zyl ,J (Jeandre)	2	2	425	2	2	425	0	0	0	0	0	0
4	Van Zyl ,J (Jeandre)	2	1158.4	1583.4	2	1153.6	1583.4	0	0	0	0	0	0
5	Muller ,J (Janke)	2	1.5	212.5	2	1.5	212.5	0	0	0	0	0	0
5	Muller ,J (Janke)	2	992	1204.6	2	991.8	1204.6	0	0	0	0	0	0
6	Hannies ,D (Deacon)	2	1.5	212.5	2	1.5	212.5	0	0	0	0	0	0
6	Hannies ,D (Deacon)	2	1189.3	1401.8	2	1186.6	1401.8	0	0	0	0	0	0
7	Van Loggerenberg ,P (Pierre)	2	2	425	2	2	425	0	0	0	0	0	0
7	Van Loggerenberg ,P (Pierre)	2	901.1	1326.1	2	897.8	1326.1	0	0	0	0	0	0
8	Muller ,L (Luzane)	2	1	0	2	1	0	0	0	0	0	0	0
8	Muller ,L (Luzane)	2	1134.9	1134.9	2	1136.7	1134.9	0	0	0	0	0	0
9	Lewis ,T (Tyler)	2	2	425	2	2	425	0	0	0	0	0	0
9	Lewis ,T (Tyler)	2	922.7	1347.7	2	924.4	1347.7	0	0	0	0	0	0
10	Odendaal ,J (Juan)	2	2	425	2	2	425	0	0	0	0	0	0
10	Odendaal ,J (Juan)	2	1221.1	1646.1	2	1216.6	1646.1	0	0	0	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

Ratings

Tournaments

Grand Prix

Statistics

Notifications

PLAYER PAGE

Personal

Mostert, J (Jan-Abraham)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms