Chess South Africa Ratings Database

PLAYER PAGE

Personal

Gretffrath, S (Sonja)

Chess SA id

2100149930

FIDE id

Date of birth

2010-01-30 (U16)

Gender

Female

Region

Eden (WEG)

Citizen

RSA

Titles

Chess SA registered

Last active game

2023-07-29

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1313.7	1303.2	1200	1200
Raw rating	1313.7	1303.2	1200	1200
Weighted rating	1313.7	1303.1	1200	1200
Weighted performance	915.1	909.6	0	0
Floor	824.2	841.3	700	700
K-factor	36	36	36	36
Min/Max rating change allowed	141	143.1	165.8	165.8
Highest rating	1394 2023-03-01	1389.2 2023-03-01	1200 2018-10-01	1200 2018-10-01
Highest raw rating	1324.2 2023-04-01	1341.3 2023-04-01	1200 2024-03-01	1200 2024-03-01
Highest weighted rating	1324.2 2025-02-01	1341.3 2025-02-01	1200 2018-10-01	1200 2018-10-01
Highest weighted performance	1394 2023-03-01	1389.2 2023-03-01	1200 2024-03-01	1200 2024-03-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1313.7	1303.2	1200	1200
Analysis
Rating	1313.7	1303.2	1200	1200
Raw rating	1313.7	1303.2	1200	1200
Weighted rating	1313.7	1303.1	1200
Weighted performance	915.1	909.6	0
K-factor	36	36	36	36
Floor	824.2	841.3	700	700
Max/Min rating change allowed	141	143.1	165.8	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	1313.7	1303.2	1200	1200
New weighted rating	1313.7	1303.1	1200	1200
New weighted performance	907.3	901.9	0	0
Temp new rating	1313.7	1303.2	1200	1200
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1313.7	1303.2	1200	1200
New K-factor	36	36	36	36
New floor	824.2	841.3	700	700

Item	Main	Standard
	0	0
	0	0
	0	0
	25	25
	5	5
	0	0
History	70	70

Games since
	Main 0	Standard 0		Rapid 0		Blitz 0
Gender	Female
Age group	U16
Region	Eden (WEG)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	-1		-1		-1
Female	-1		-1		-1
U16	-1		-1		-1
U16 Female	-1		-1		-1
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Female	-1		-1		-1
U16	-1		-1		-1
U16 Female	-1		-1		-1
Rapid
	RSA		Province		Region
Overall	-1		-1		-1
Female	-1		-1		-1
U16	-1		-1		-1
U16 Female	-1		-1		-1
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Female	-1		-1		-1
U16	-1		-1		-1
U16 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	70	42	60	85	1241.6	1326.6
Standard	70	42	60	85	1241.6	1326.6
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-11-01	1313.7	1303.2	1200	1200
2025-09-30	1313.7	1303.2	1200	1200
2025-09-01	1313.7	1303.2	1200	1200
2025-08-01	1313.7	1303.2	1200	1200
2025-07-01	1313.7	1303.2	1200	1200
2025-06-01	1313.7	1303.2	1200	1200
2025-05-01	1313.7	1303.2	1200	1200
2025-04-01	1313.7	1303.2	1200	1200
2025-03-01	1313.7	1303.2	1200	1200
2025-02-01	1313.7	1303.2	1200	1200
2025-01-01	1313.6	1302.8	1200	1200
2024-12-01	1313.6	1302.8	1200	1200
2024-11-01	1313.6	1302.8	1200	1200
2024-10-01	1313.6	1302.8	1200	1200
2024-09-01	1313.6	1302.8	1200	1200
2024-08-01	1313.6	1302.8	1200	1200
2024-07-01	1313.6	1302.8	1200	1200
2024-09-01	1313.6	1302.8	1200	1200
2024-05-01	1313.6	1302.8	1200	1200
2024-04-01	1313.6	1302.8	1200	1200
2024-03-01	1313.6	1302.8	1200	1200
2024-02-01	1313.6	1302.8	1200	1200
2024-01-01	1313.6	1302.8	1200	1200
2023-12-01	1313.6	1302.8	1200	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	Top Schools 2023 (U13)	2023-07-29	2023-07-29	Standard	Eden (WEG)	5	4	1.5	Yes	Analysis
2	Western Cape PS Individuals 2023 (U13 Girls)	2023-05-05	2023-05-06	Standard	Cape Town (WCT)	6	6	2	Yes	Analysis
3	Eden Trails 1 2023 (U13 Girls)	2023-03-11	2023-03-11	Standard	Eden (WEG)	5	5	4	Yes	Analysis
4	George Chess Trials 3 2023 (U13 Girls)	2023-02-25	2023-02-25	Standard	Eden (WEG)	5	5	4	Yes	Analysis
5	George Chess Trials 2 2023 (U13 Girls)	2023-02-11	2023-02-11	Standard	Cape Town (WCT)	5	5	2	Yes	Analysis
6	George Topskole 2022 (O13)	2022-07-30	2022-07-30	Standard	Eden (WEG)	5	5	4	Yes	Analysis
7	Eden Schools Closed Trials 1 2020 (U11 Girls)	2020-03-07	2020-03-07	Standard	Eden (WEG)	5	5	4	Yes	Analysis
8	George Trial 3 2020 (U12)	2020-02-22	2020-02-22	Standard	Eden (WEG)	5	0	0	No	Analysis
9	George Trial 2 2020 (U12)	2020-02-08	2020-02-08	Standard	Eden (WEG)	5	5	4	Yes	Analysis
10	George Trial 1 2020 (U12)	2020-01-25	2020-01-25	Standard	Eden (WEG)	5	5	3	Yes	Analysis
11	Western Cape Schools Individuals 2019 (U9 Girls)	2019-05-18	2019-05-19	Standard	Eden (WEG)	6	6	3	Yes	Analysis
12	Eden Trials 2 2019 (U10 Open)	2019-04-13	2019-04-13	Standard	Eden (WEG)	5	5	3	Yes	Analysis
13	Eden Trials 1 2019 (U10 Open)	2019-03-02	2019-03-02	Standard	Eden (WEG)	5	5	2	Yes	Analysis
14	George Trials 3 2019 (U10)	2019-02-23	2019-02-23	Standard	Eden (WEG)	5	4	2.5	Yes	Analysis
15	George Trials 2 2019 (U10)	2019-02-09	2019-02-09	Standard	Eden (WEG)	5	5	3	Yes	Analysis

#	Games	Start				End
1	6	Tournament George Chess Trials 3 2023				Tournament Eden Trails 1 2023
		date 2023-02-25	rnd 4	type Standard	result 1	date 2023-03-11	rnd 4	type Standard	result 1
		Opponent Wessels, H (Hanjah)				Opponent Mpuru, M (Moyisi)
2	6	Tournament Eden Schools Closed Trials 1 2020				Tournament George Topskole 2022
		date 2020-03-07	rnd 3	type Standard	result 1	date 2022-07-30	rnd 3	type Standard	result 1
		Opponent Jansen, N (Nina Lee)				Opponent Stewart, E (Ewald)
3	4	Tournament George Trial 2 2020				Tournament Eden Schools Closed Trials 1 2020
		date 2020-02-08	rnd 3	type Standard	result 1	date 2020-03-07	rnd 1	type Standard	result 1
		Opponent Rodriguez, C (Chloe-Jade)				Opponent Robertson, M (Melcaylinn)

#	Games	Start				End
1	6	Tournament George Chess Trials 3 2023				Tournament Eden Trails 1 2023
		date 2023-02-25	rnd 4	type Standard	result 1	date 2023-03-11	rnd 4	type Standard	result 1
		Opponent Wessels, H (Hanjah)				Opponent Mpuru, M (Moyisi)
2	6	Tournament Eden Schools Closed Trials 1 2020				Tournament George Topskole 2022
		date 2020-03-07	rnd 3	type Standard	result 1	date 2022-07-30	rnd 3	type Standard	result 1
		Opponent Jansen, N (Nina Lee)				Opponent Stewart, E (Ewald)
3	4	Tournament George Trial 2 2020				Tournament Eden Schools Closed Trials 1 2020
		date 2020-02-08	rnd 3	type Standard	result 1	date 2020-03-07	rnd 1	type Standard	result 1
		Opponent Rodriguez, C (Chloe-Jade)				Opponent Robertson, M (Melcaylinn)

No games found.

#	Games	Start				End

No games found.

#	Games	Start				End

#	Games	Start				End
1	6	Tournament George Chess Trials 3 2023				Tournament Eden Trails 1 2023
		date 2023-02-25	rnd 4	type Standard	result 1	date 2023-03-11	rnd 4	type Standard	result 1
		Opponent Wessels, H (Hanjah)				Opponent Mpuru, M (Moyisi)
2	6	Tournament Eden Schools Closed Trials 1 2020				Tournament George Topskole 2022
		date 2020-03-07	rnd 3	type Standard	result 1	date 2022-07-30	rnd 3	type Standard	result 1
		Opponent Jansen, N (Nina Lee)				Opponent Stewart, E (Ewald)
3	4	Tournament George Trial 2 2020				Tournament Eden Schools Closed Trials 1 2020
		date 2020-02-08	rnd 3	type Standard	result 1	date 2020-03-07	rnd 1	type Standard	result 1
		Opponent Rodriguez, C (Chloe-Jade)				Opponent Robertson, M (Melcaylinn)

#	Games	Start				End
1	6	Tournament George Chess Trials 3 2023				Tournament Eden Trails 1 2023
		date 2023-02-25	rnd 4	type Standard	result 1	date 2023-03-11	rnd 4	type Standard	result 1
		Opponent Wessels, H (Hanjah)				Opponent Mpuru, M (Moyisi)
2	6	Tournament Eden Schools Closed Trials 1 2020				Tournament George Topskole 2022
		date 2020-03-07	rnd 3	type Standard	result 1	date 2022-07-30	rnd 3	type Standard	result 1
		Opponent Jansen, N (Nina Lee)				Opponent Stewart, E (Ewald)
3	4	Tournament George Trial 2 2020				Tournament Eden Schools Closed Trials 1 2020
		date 2020-02-08	rnd 3	type Standard	result 1	date 2020-03-07	rnd 1	type Standard	result 1
		Opponent Rodriguez, C (Chloe-Jade)				Opponent Robertson, M (Melcaylinn)

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	Douglas ,C (Caitlin)	3	0	-425	3	0	-425	0	0	0	0	0	0
1	Douglas ,C (Caitlin)	3	1387.2	962.2	3	1371	962.2	0	0	0	0	0	0
2	Gouws ,G (Garlan)	3	1	-141.7	3	1	-141.7	0	0	0	0	0	0
2	Gouws ,G (Garlan)	3	1267	1125.3	3	1241.7	1125.3	0	0	0	0	0	0
3	Mpuru ,M (Moyisi)	3	2.5	283.3	3	2.5	283.3	0	0	0	0	0	0
3	Mpuru ,M (Moyisi)	3	1432.6	1715.9	3	1441.1	1715.9	0	0	0	0	0	0
4	Van Zyl ,C (Carli)	2	0	-425	2	0	-425	0	0	0	0	0	0
4	Van Zyl ,C (Carli)	2	1376.8	951.8	2	1380.6	951.8	0	0	0	0	0	0
5	Kruger ,R (Riasha)	2	2	425	2	2	425	0	0	0	0	0	0
5	Kruger ,R (Riasha)	2	1247.5	1672.5	2	1253.3	1672.5	0	0	0	0	0	0
6	Booysen ,L (Lukas)	2	0	-425	2	0	-425	0	0	0	0	0	0
6	Booysen ,L (Lukas)	2	1459.9	1034.9	2	1458.6	1034.9	0	0	0	0	0	0
7	Da Silva ,D (Darren)	2	1	0	2	1	0	0	0	0	0	0	0
7	Da Silva ,D (Darren)	2	1182.1	1182.1	2	1178.4	1182.1	0	0	0	0	0	0
8	Jansen ,N (Nina Lee)	1	1	425	1	1	425	0	0	0	0	0	0
8	Jansen ,N (Nina Lee)	1	1146.9	1571.9	1	1135.2	1571.9	0	0	0	0	0	0
9	Gao ,Z (Zhi)	1	1	425	1	1	425	0	0	0	0	0	0
9	Gao ,Z (Zhi)	1	1200	1625	1	1200	1625	0	0	0	0	0	0
10	Reid ,H (Hannah)	1	0	-425	1	0	-425	0	0	0	0	0	0
10	Reid ,H (Hannah)	1	1246.1	821.1	1	1233.6	821.1	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

Gretffrath, S (Sonja)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms