Chess South Africa Ratings Database

PLAYER PAGE

Personal

Oosthuizen, J (Jaco)

Chess SA id

1140190896

FIDE id

Date of birth

2014-01-22 (U12)

Gender

Male

Region

Tshwane (GTP)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-09-27

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

1528.8

Item	Main	Standard	Rapid	Blitz
Rating	1448.7	1454.4	1217.6	1200
Raw rating	1386.5	1406.2	1217.6	1200
Weighted rating	1278.1	1282.5	1217.6	1200
Weighted performance	1457.9	1454.4	0	0
Floor	886.5	906.2	717.6	700
K-factor	36	32	36	36
Min/Max rating change allowed	127.1	123.6	161.7	165.8
Highest rating	1448.7 2025-11-01	1458.6 2024-05-01	1288.8 2023-11-01	1200 2018-10-01
Highest raw rating	1386.5 2025-11-01	1406.2 2025-11-01	1217.6 2024-02-01	1200 2024-02-01
Highest weighted rating	1278.1 2025-11-01	1282.5 2025-11-01	1217.4 2025-08-01	1200 2018-10-01
Highest weighted performance	1457.9 2025-11-01	1458.6 2024-05-01	1288.8 2023-11-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0.4	-8.8	0	0
New rating	1449.1	1445.6	1217.6	1200
Analysis
Rating	1448.7	1454.4	1217.6	1200
Raw rating	1386.5	1406.2	1217.6	1200
Weighted rating	1278.1	1282.5	1217.6
Weighted performance	1457.9	1454.4	0
K-factor	36	32	36	36
Floor	886.5	906.2	717.6	700
Max/Min rating change allowed	127.1	123.6	161.7	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	1386.5	1406.2	1217.6	1200
New weighted rating	1288.4	1294.3	1217.6	1200
New weighted performance	1449.1	1445.6	0	0
Temp new rating	1449.1	1445.6	1217.6	1200
Temp new rating +/-	0.4	-8.8	0	0
Final new rating +/-	0.4	-8.8	0	0
New rating	1449.1	1445.6	1217.6	1200
New K-factor	36	32	36	36
New floor	886.5	906.2	717.6	700

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

Games since
	Main 30	Standard 25		Rapid 5		Blitz 0
Gender	Male
Age group	U12
Region	Tshwane (GTP)
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	20	11	55	42.5	1449.1	1491.6
Standard	20	11	55	42.5	1449.1	1491.6
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	30	17.5	58.33	70.8	1384.1	1454.9
Standard	25	14.5	58	68	1417.8	1485.8
Rapid	5	3	60	85	1215.3	1300.3
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-11-01	1386.5	1406.2	1217.6	1200
2025-09-30	1306.1	1314.1	1217.6	1200
2025-09-01	1306.1	1314.1	1217.6	1200
2025-08-01	1303	1313	1217.6	1200
2025-07-01	1303	1313	1217.6	1200
2025-06-01	1303	1313	1217.6	1200
2025-05-01	1252.1	1252.6	1217.6	1200
2025-04-01	1252.1	1252.6	1217.6	1200
2025-03-01	1252.1	1252.6	1217.6	1200
2025-02-01	1252.1	1252.6	1217.6	1200
2025-01-01	1252.1	1252.6	1217.6	1200
2024-12-01	1252.1	1252.6	1217.6	1200
2024-11-01	1252.1	1252.6	1217.6	1200
2024-10-01	1252.1	1252.6	1217.6	1200
2024-09-01	1252.1	1252.6	1217.6	1200
2024-08-01	1252.1	1252.6	1217.6	1200
2024-07-01	1252.1	1252.6	1217.6	1200
2024-09-01	1252.1	1252.6	1217.6	1200
2024-05-01	1208.8	1200	1217.6	1200
2024-04-01	1208.8	1200	1217.6	1200
2024-03-01	1208.8	1200	1217.6	1200
2024-02-01	1208.8	1200	1217.6	1200
2024-01-01	1208.8	1200	1217.6	1200
2023-12-01	1208.8	1200	1217.6	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	2025 Gauteng Top Schools Teams (U11)	2025-08-29	2025-08-29	Standard	Tshwane (GTP)	5	5	1.5	Yes	Analysis
2	2025 Gauteng Schools Provincial Individual Chess Championship (U11 Boys)	2025-09-27	2025-09-27	Standard	Tshwane (GTP)	5	5	4	Yes	Analysis
3	2025 Tshwane South School District CLOSED League Championship (U11A)	2025-08-15	2025-08-15	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
4	2025 Tshwane South School District Individual Finals (D4) (U11 Boys)	2025-05-10	2025-05-10	Standard	Tshwane (GTP)	5	5	3.5	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	2025 Gauteng Top Schools Teams (U11)	2025-08-29	2025-08-29	Standard	Tshwane (GTP)	5	5	1.5	Yes	Analysis
2	2025 Gauteng Schools Provincial Individual Chess Championship (U11 Boys)	2025-09-27	2025-09-27	Standard	Tshwane (GTP)	5	5	4	Yes	Analysis
3	2025 Tshwane South School District CLOSED League Championship (U11A)	2025-08-15	2025-08-15	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
4	2025 Tshwane South School District Individual Finals (D4) (U11 Boys)	2025-05-10	2025-05-10	Standard	Tshwane (GTP)	5	5	3.5	Yes	Analysis
5	2024 Tshwane South School District CLOSED Individual Championships (U11 Mixed)	2024-05-11	2024-05-11	Standard	Tshwane (GTP)	5	5	3.5	Yes	Analysis
6	CCC Midstream Rapid 2023	2023-11-27	2023-11-27	Rapid	Tshwane (GTP)	5	5	3	Yes	Analysis

#	Games	Start				End
1	5	Tournament 2025 Gauteng Schools Provincial Individual Chess Championship				Tournament 2025 Gauteng Schools Provincial Individual Chess Championship
		date 2025-09-27	rnd 1	type Standard	result 1	date 2025-09-27	rnd 5	type Standard	result 0.5
		Opponent Radebe, L (Lwazi)				Opponent Brancato, S (Sebastian)
2	4	Tournament 2024 Tshwane South School District CLOSED Individual Championships				Tournament 2025 Tshwane South School District Individual Finals (D4)
		date 2024-05-11	rnd 5	type Standard	result 1	date 2025-05-10	rnd 3	type Standard	result 0.5
		Opponent Van Der Wath, L (Logan)				Opponent Van Der Merwe, ZC (Zander Christiaan)
3	4	Tournament CCC Midstream Rapid 2023				Tournament 2024 Tshwane South School District CLOSED Individual Championships
		date 2023-11-27	rnd 5	type Rapid	result 1	date 2024-05-11	rnd 3	type Standard	result 1
		Opponent Gruenenfelder, E (Ellie)				Opponent Kluge, J (John)

#	Games	Start				End
1	4	Tournament 2024 Tshwane South School District CLOSED Individual Championships				Tournament 2025 Tshwane South School District Individual Finals (D4)
		date 2024-05-11	rnd 5	type Standard	result 1	date 2025-05-10	rnd 3	type Standard	result 0.5
		Opponent Van Der Wath, L (Logan)				Opponent Van Der Merwe, ZC (Zander Christiaan)
2	3	Tournament 2024 Tshwane South School District CLOSED Individual Championships				Tournament 2024 Tshwane South School District CLOSED Individual Championships
		date 2024-05-11	rnd 1	type Standard	result 1	date 2024-05-11	rnd 3	type Standard	result 1
		Opponent Motloung, L (Lapisi)				Opponent Kluge, J (John)
3	2	Tournament 2025 Tshwane South School District CLOSED League Championship				Tournament 2025 Tshwane South School District CLOSED League Championship
		date 2025-08-15	rnd 2	type Standard	result 1	date 2025-08-15	rnd 3	type Standard	result 1
		Opponent Van Der Merwe, D (Duvan)				Opponent Van Wyk, W (Wouter)

#	Games	Start				End
1	2	Tournament CCC Midstream Rapid 2023				Tournament CCC Midstream Rapid 2023
		date 2023-11-27	rnd 2	type Rapid	result 1	date 2023-11-27	rnd 3	type Rapid	result 1
		Opponent Wilson, J (Jami)				Opponent Koreng, G (Gogontle)
2	1	Tournament CCC Midstream Rapid 2023				Tournament CCC Midstream Rapid 2023
		date 2023-11-27	rnd 5	type Rapid	result 1	date 2023-11-27	rnd 5	type Rapid	result 1
		Opponent Gruenenfelder, E (Ellie)				Opponent Gruenenfelder, E (Ellie)

No games found.

#	Games	Start				End

#	Games	Start				End
1	3	Tournament 2024 Tshwane South School District CLOSED Individual Championships				Tournament 2025 Tshwane South School District Individual Finals (D4)
		date 2024-05-11	rnd 5	type Standard	result 1	date 2025-05-10	rnd 2	type Standard	result 1
		Opponent Van Der Wath, L (Logan)				Opponent Mothee, A (Aric)
2	2	Tournament 2025 Tshwane South School District CLOSED League Championship				Tournament 2025 Tshwane South School District CLOSED League Championship
		date 2025-08-15	rnd 2	type Standard	result 1	date 2025-08-15	rnd 3	type Standard	result 1
		Opponent Van Der Merwe, D (Duvan)				Opponent Van Wyk, W (Wouter)
3	2	Tournament CCC Midstream Rapid 2023				Tournament 2024 Tshwane South School District CLOSED Individual Championships
		date 2023-11-27	rnd 5	type Rapid	result 1	date 2024-05-11	rnd 1	type Standard	result 1
		Opponent Gruenenfelder, E (Ellie)				Opponent Motloung, L (Lapisi)

#	Games	Start				End
1	3	Tournament 2024 Tshwane South School District CLOSED Individual Championships				Tournament 2025 Tshwane South School District Individual Finals (D4)
		date 2024-05-11	rnd 5	type Standard	result 1	date 2025-05-10	rnd 2	type Standard	result 1
		Opponent Van Der Wath, L (Logan)				Opponent Mothee, A (Aric)
2	2	Tournament 2025 Tshwane South School District CLOSED League Championship				Tournament 2025 Tshwane South School District CLOSED League Championship
		date 2025-08-15	rnd 2	type Standard	result 1	date 2025-08-15	rnd 3	type Standard	result 1
		Opponent Van Der Merwe, D (Duvan)				Opponent Van Wyk, W (Wouter)
3	1	Tournament 2025 Tshwane South School District Individual Finals (D4)				Tournament 2025 Tshwane South School District Individual Finals (D4)
		date 2025-05-10	rnd 5	type Standard	result 1	date 2025-05-10	rnd 5	type Standard	result 1
		Opponent Deary, A (Alex)				Opponent Deary, A (Alex)

#	Games	Start				End
1	2	Tournament CCC Midstream Rapid 2023				Tournament CCC Midstream Rapid 2023
		date 2023-11-27	rnd 2	type Rapid	result 1	date 2023-11-27	rnd 3	type Rapid	result 1
		Opponent Wilson, J (Jami)				Opponent Koreng, G (Gogontle)
2	1	Tournament CCC Midstream Rapid 2023				Tournament CCC Midstream Rapid 2023
		date 2023-11-27	rnd 5	type Rapid	result 1	date 2023-11-27	rnd 5	type Rapid	result 1
		Opponent Gruenenfelder, E (Ellie)				Opponent Gruenenfelder, E (Ellie)

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	Janse Van Rensburg ,J (Josh)	3	0.5	-283.3	3	0.5	-283.3	0	0	0	0	0	0
1	Janse Van Rensburg ,J (Josh)	3	1549.8	1266.5	3	1541.6	1266.5	0	0	0	0	0	0
2	Van Der Merwe ,D (Duvan)	1	1	425	1	1	425	0	0	0	0	0	0
2	Van Der Merwe ,D (Duvan)	1	1207.2	1632.2	1	1205.1	1632.2	0	0	0	0	0	0
3	Sithole ,A (Adiel Ean)	1	1	425	1	1	425	0	0	0	0	0	0
3	Sithole ,A (Adiel Ean)	1	1555.3	1980.3	1	1560.1	1980.3	0	0	0	0	0	0
4	Vorster ,J (James)	1	0	-425	1	0	-425	0	0	0	0	0	0
4	Vorster ,J (James)	1	1230.8	805.8	1	1232.1	805.8	0	0	0	0	0	0
5	Bester ,J (Johannes)	1	0.5	0	1	0.5	0	0	0	0	0	0	0
5	Bester ,J (Johannes)	1	1528.6	1528.6	1	1526.3	1528.6	0	0	0	0	0	0
6	Roos ,E (Ewan)	1	0	-425	1	0	-425	0	0	0	0	0	0
6	Roos ,E (Ewan)	1	1291.6	866.6	1	1289.8	866.6	0	0	0	0	0	0
7	Schutte ,CB (Christiaan Benjamin)	1	1	425	1	1	425	0	0	0	0	0	0
7	Schutte ,CB (Christiaan Benjamin)	1	1525.4	1950.4	1	1539.2	1950.4	0	0	0	0	0	0
8	Van Der Westhuyzen ,R (Ruan)	1	1	425	1	1	425	0	0	0	0	0	0
8	Van Der Westhuyzen ,R (Ruan)	1	1260.1	1685.1	1	1263	1685.1	0	0	0	0	0	0
9	Kluge ,J (John)	1	1	425	1	1	425	0	0	0	0	0	0
9	Kluge ,J (John)	1	1224.7	1649.7	1	1200	1649.7	0	0	0	0	0	0
10	Radebe ,L (Lwazi)	1	1	425	1	1	425	0	0	0	0	0	0
10	Radebe ,L (Lwazi)	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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Personal

Oosthuizen, J (Jaco)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms