Chess South Africa Ratings Database

PLAYER PAGE

Personal

Johnstone, J (Jessica)

Chess SA id

209073138

FIDE id

Date of birth

2009-05-27 (U18)

Gender

Female

Region

Tshwane (GTP)

Citizen

RSA

Titles

Chess SA registered

Last active game

2023-02-05

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	970.8	967.5	598.4	598.4
Raw rating	970.8	967.5	598.4	598.4
Weighted rating	970.8	967.5	598.4	598.4
Weighted performance	442.5	439.8	0	0
Floor	537.4	525.8	500	500
K-factor	40	40	40	40
Min/Max rating change allowed	229.8	230.9	390.7	390.7
Highest rating	1200 2024-11-01	1200 2024-11-01	1200 2024-03-01	1200 2024-03-01
Highest raw rating	1037.4 2019-07-01	1025.8 2018-10-01	598.4 2024-03-01	598.4 2024-03-01
Highest weighted rating	1037.4 2024-11-01	1025.8 2024-11-01	598.4 2024-11-01	598.4 2024-11-01
Highest weighted performance	1200 2024-12-01	1200 2024-12-01	1200 2024-03-01	1200 2024-03-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	970.8	967.5	598.4	598.4
Analysis
Rating	970.8	967.5	598.4	598.4
Raw rating	970.8	967.5	598.4	598.4
Weighted rating	970.8	967.5	598.4
Weighted performance	442.5	439.8	0
K-factor	40	40	40	40
Floor	537.4	525.8	500	500
Max/Min rating change allowed	229.8	230.9	390.7	390.7
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	970.8	967.5	598.4	598.4
New weighted rating	970.8	967.5	598.4	598.4
New weighted performance	442.1	439.5	0	0
Temp new rating	970.8	967.5	598.4	598.4
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	970.8	967.5	598.4	598.4
New K-factor	40	40	40	40
New floor	537.4	525.8	500	500

Item	Main	Standard	Rapid
	0	0	0
	0	0	0
	0	0	0
	5	5	0
	0	0	0
	5	5	0
History	266	261	5

Games since
	Main 0	Standard 0		Rapid 0		Blitz 0
Gender	Female
Age group	U18
Region	Tshwane (GTP)
Province	Gauteng (GT)
Main
	RSA		Province		Region
Overall	-1		-1		-1
Female	-1		-1		-1
U18	-1		-1		-1
U18 Female	-1		-1		-1
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Female	-1		-1		-1
U18	-1		-1		-1
U18 Female	-1		-1		-1
Rapid
	RSA		Province		Region
Overall	-1		-1		-1
Female	-1		-1		-1
U18	-1		-1		-1
U18 Female	-1		-1		-1
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Female	-1		-1		-1
U18	-1		-1		-1
U18 Female	-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	53	45.69	-36.6	988.3	951.7
Standard	116	53	45.69	-36.6	988.3	951.7
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-09-30	970.8	967.5	598.4	598.4
2025-09-01	970.8	967.5	598.4	598.4
2025-08-01	970.8	967.5	598.4	598.4
2025-07-01	970.8	967.5	598.4	598.4
2025-06-01	970.8	967.5	598.4	598.4
2025-05-01	970.8	967.5	598.4	598.4
2025-04-01	970.8	967.5	598.4	598.4
2025-03-01	970.8	967.5	598.4	598.4
2025-02-01	970.8	967.5	598.4	598.4
2025-01-01	970.8	967.5	598.4	598.4
2024-12-01	970.8	967.5	598.4	598.4
2024-11-01	970.8	967.5	598.4	598.4
2024-10-01	970.8	967.5	598.4	598.4
2024-09-01	970.8	967.5	598.4	598.4
2024-08-01	970.8	967.5	598.4	598.4
2024-07-01	970.8	967.5	598.4	598.4
2024-06-01	970.8	967.5	598.4	598.4
2024-08-01	970.8	967.5	598.4	598.4
2024-04-01	970.8	967.5	598.4	598.4
2024-03-01	970.8	967.5	598.4	598.4
2024-02-01	970.8	967.5	598.4	598.4
2024-01-01	970.8	967.5	598.4	598.4
2023-12-01	970.8	967.5	598.4	598.4
2023-11-01	970.8	967.5	598.4	598.4

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	2023 Piet Robbertse Fide Rated Open Chess Tournament (D)	2023-02-04	2023-02-05	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
2	2021 Registration Tournament (D)	2021-03-13	2021-03-13	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
3	2019 Etienne Lewis Trials (U12 Girls)	2019-08-30	2019-09-01	Standard	Tshwane (GTP)	7	7	0	Yes	Analysis
4	2019 Jacaranda Round Robin (L)	2019-08-03	2019-08-03	Standard	Tshwane (GTP)	5	5	1	Yes	Analysis
5	2019 Alekhine Open (D)	2019-08-09	2019-08-10	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
6	2019 Swartkop Open (D)	2019-06-15	2019-06-15	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
7	2019 Capablanca Chess Festival (Swiss D)	2019-04-19	2019-04-21	Standard	Tshwane (GTP)	7	7	2	Yes	Analysis
8	2019 Waterkloof Open (D)	2019-03-02	2019-03-03	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
9	2019 TuksChess Open (C)	2019-02-23	2019-02-23	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
10	2018 Tshwane Inter Region (U10C)	2018-12-01	2018-12-01	Standard	Cape Town (WCT)	5	5	2	Yes	Analysis
11	2018 Wild Card Chess Championships (U10 Girls)	2018-12-21	2018-12-24	Standard	4 Knights (4K)	7	7	3	Yes	Analysis
12	South African Junior Team Championships 2018 (U10 Girls)	2018-12-16	2018-12-20	Standard	4 Knights (4K)	7	5	3	Yes	Analysis
13	2018 Lardies Ope (D)	2018-10-27	2018-10-27	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
14	2018 Etienne Lewis Trials (U10 Girls)	2018-08-31	2018-09-02	Standard	Tshwane (GTP)	7	7	4	Yes	Analysis
15	2018 Centurion Chess Club Open (D)	2018-09-29	2018-09-29	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
16	2018 Alekhine Open (D)	2018-08-09	2018-08-11	Standard	Tshwane (GTP)	6	6	3	Yes	Analysis
17	2018 Menlo Open Chess Tournament (D)	2018-07-21	2018-07-21	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
18	2018 Capablanca Swiss (D)	2018-04-27	2018-04-27	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
19	2018 Crawford Open (D)	2018-03-24	2018-03-24	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
20	2018 Constantia Park Open (D)	2018-02-10	2018-02-10	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
21	South African Junior Team Championships 2017 (U10 Girls)	2018-01-04	2018-01-08	Standard	4 Knights (4K)	7	7	6	Yes	Analysis

#	Games	Start				End
1	6	Tournament South African Junior Team Championships 2017				Tournament South African Junior Team Championships 2017
		date 2018-01-04	rnd 1	type Standard	result 1	date 2018-01-07	rnd 6	type Standard	result 1
		Opponent Brink, CC (Charlotte Chantey)				Opponent Combrink, H (Helen)
2	3	Tournament 2019 Waterkloof Open				Tournament 2019 Waterkloof Open
		date 2019-03-02	rnd 1	type Standard	result 1	date 2019-03-02	rnd 3	type Standard	result 1
		Opponent Dladla, L (Luvo)				Opponent Nayagar, Y (Yashiel)
3	3	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-17	rnd 3	type Standard	result 1	date 2018-12-18	rnd 5	type Standard	result 1
		Opponent Van Der Merwe, D (Danika)				Opponent Msemburi, H (Hannah)

#	Games	Start				End
1	6	Tournament South African Junior Team Championships 2017				Tournament South African Junior Team Championships 2017
		date 2018-01-04	rnd 1	type Standard	result 1	date 2018-01-07	rnd 6	type Standard	result 1
		Opponent Brink, CC (Charlotte Chantey)				Opponent Combrink, H (Helen)
2	3	Tournament 2019 Waterkloof Open				Tournament 2019 Waterkloof Open
		date 2019-03-02	rnd 1	type Standard	result 1	date 2019-03-02	rnd 3	type Standard	result 1
		Opponent Dladla, L (Luvo)				Opponent Nayagar, Y (Yashiel)
3	3	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-17	rnd 3	type Standard	result 1	date 2018-12-18	rnd 5	type Standard	result 1
		Opponent Van Der Merwe, D (Danika)				Opponent Msemburi, H (Hannah)

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 South African Junior Team Championships 2017
		date 2018-01-04	rnd 1	type Standard	result 1	date 2018-01-07	rnd 6	type Standard	result 1
		Opponent Brink, CC (Charlotte Chantey)				Opponent Combrink, H (Helen)
2	3	Tournament 2019 Waterkloof Open				Tournament 2019 Waterkloof Open
		date 2019-03-02	rnd 1	type Standard	result 1	date 2019-03-02	rnd 3	type Standard	result 1
		Opponent Dladla, L (Luvo)				Opponent Nayagar, Y (Yashiel)
3	3	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-17	rnd 3	type Standard	result 1	date 2018-12-18	rnd 5	type Standard	result 1
		Opponent Van Der Merwe, D (Danika)				Opponent Msemburi, H (Hannah)

#	Games	Start				End
1	6	Tournament South African Junior Team Championships 2017				Tournament South African Junior Team Championships 2017
		date 2018-01-04	rnd 1	type Standard	result 1	date 2018-01-07	rnd 6	type Standard	result 1
		Opponent Brink, CC (Charlotte Chantey)				Opponent Combrink, H (Helen)
2	3	Tournament 2019 Waterkloof Open				Tournament 2019 Waterkloof Open
		date 2019-03-02	rnd 1	type Standard	result 1	date 2019-03-02	rnd 3	type Standard	result 1
		Opponent Dladla, L (Luvo)				Opponent Nayagar, Y (Yashiel)
3	3	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-17	rnd 3	type Standard	result 1	date 2018-12-18	rnd 5	type Standard	result 1
		Opponent Van Der Merwe, D (Danika)				Opponent Msemburi, H (Hannah)

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	Louw ,N (Nova)	3	3	425	3	3	425	0	0	0	0	0	0
1	Louw ,N (Nova)	3	708.2	1133.2	3	705.2	1133.2	0	0	0	0	0	0
2	Lombard ,A (Anjubelle Ttalise)	3	3	425	3	3	425	0	0	0	0	0	0
2	Lombard ,A (Anjubelle Ttalise)	3	966.4	1391.4	3	944.9	1391.4	0	0	0	0	0	0
3	Erlank ,BG (Brandon Graham)	2	0	-425	2	0	-425	0	0	0	0	0	0
3	Erlank ,BG (Brandon Graham)	2	984.8	559.8	2	989.8	559.8	0	0	0	0	0	0
4	Fuhri ,R (Ruben)	2	0	-425	2	0	-425	0	0	0	0	0	0
4	Fuhri ,R (Ruben)	2	1223.4	798.4	2	1225.6	798.4	0	0	0	0	0	0
5	Reyneke ,T (Talia)	2	0	-425	2	0	-425	0	0	0	0	0	0
5	Reyneke ,T (Talia)	2	991.2	566.2	2	983.4	566.2	0	0	0	0	0	0
6	Du Preez ,J (Julian)	2	0	-425	2	0	-425	0	0	0	0	0	0
6	Du Preez ,J (Julian)	2	1194.6	769.6	2	1162.9	769.6	0	0	0	0	0	0
7	Dladla ,L (Luvo)	2	2	425	2	2	425	0	0	0	0	0	0
7	Dladla ,L (Luvo)	2	1101	1526	2	1082.4	1526	0	0	0	0	0	0
8	Oosthuizen ,L (Luelsje)	2	0	-425	2	0	-425	0	0	0	0	0	0
8	Oosthuizen ,L (Luelsje)	2	1084.6	659.6	2	1079.2	659.6	0	0	0	0	0	0
9	Cilliers ,WC (Willem Carel)	2	0	-425	2	0	-425	0	0	0	0	0	0
9	Cilliers ,WC (Willem Carel)	2	1141.4	716.4	2	1122.3	716.4	0	0	0	0	0	0
10	Moolman ,R (Reinhardt)	2	0	-425	2	0	-425	0	0	0	0	0	0
10	Moolman ,R (Reinhardt)	2	959	534	2	971	534	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

Johnstone, J (Jessica)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms