Chess South Africa Ratings Database

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Personal

Williams, S (Sergio)

Chess SA id

1050110213

FIDE id

Date of birth

2005-05-27 (Adult)

Gender

Male

Region

West Coast (WCU)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-08-30

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1341.9	1253.3	1345.6	974
Raw rating	1334.3	1244.7	1345.6	974
Weighted rating	1341.9	1253.3	1325.7	974
Weighted performance	1230.5	1011.7	1183.8	0
Floor	855.2	754.8	845.6	500
K-factor	36	36	36	40
Min/Max rating change allowed	136.9	155.6	134.8	228.8
Highest rating	1355.2 2025-09-01	1254.8 2024-09-01	1345.6 2025-09-01	1200 2024-02-01
Highest raw rating	1355.2 2025-09-01	1254.8 2024-09-01	1345.6 2025-09-01	974 2024-02-01
Highest weighted rating	1342.6 2025-09-01	1253.9 2025-08-01	1323.5 2025-09-01	974 2024-11-01
Highest weighted performance	1296.3 2023-09-01	1240 2022-09-01	1250.7 2023-09-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	-0.7	-0.7	0	0
New rating	1341.2	1252.7	1345.6	974
Analysis
Rating	1341.9	1253.3	1345.6	974
Raw rating	1334.3	1244.7	1345.6	974
Weighted rating	1341.9	1253.3	1325.7
Weighted performance	1230.5	1011.7	1183.8
K-factor	36	36	36	40
Floor	855.2	754.8	845.6	500
Max/Min rating change allowed	136.9	155.6	134.8	228.8
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	1334.3	1244.7	1345.6	974
New weighted rating	1341.2	1252.7	1327.7	974
New weighted performance	1230	1011.3	1183.3	0
Temp new rating	1341.2	1252.7	1345.6	974
Temp new rating +/-	-0.7	-0.7	0	0
Final new rating +/-	-0.7	-0.7	0	0
New rating	1341.2	1252.7	1345.6	974
New K-factor	36	36	36	40
New floor	855.2	754.8	845.6	500

Item	Main	Standard	Rapid
	0	0	0
	10	5	5
	10	5	5
	5	0	5
	31	17	14
	16	5	11
History	105	48	57

Games since
	Main 20	Standard 10		Rapid 10		Blitz 0
Gender	Male
Age group	Adult
Region	West Coast (WCU)
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	10	4.5	45	-42.5	1407.2	1364.8
Standard	5	1.5	30	-170	1414.1	1244.1
Rapid	5	3	60	85	1400.4	1485.4
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	105	59	56.19	52.6	1245.7	1298.3
Standard	48	25.5	53.12	26.6	1241.9	1268.5
Rapid	57	33.5	58.77	74.6	1248.9	1323.5
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-09-30	1334.3	1244.7	1345.6	974
2025-09-01	1355.2	1254.8	1345.6	974
2025-08-01	1341.6	1254.8	1326.4	974
2025-07-01	1341.6	1254.8	1326.4	974
2025-06-01	1341.5	1254.8	1326.4	974
2025-05-01	1341.2	1254.8	1326.4	974
2025-04-01	1340.8	1254.8	1326.4	974
2025-03-01	1340.4	1254.8	1326.4	974
2025-02-01	1339.8	1254.8	1326.4	974
2025-01-01	1339.1	1254.8	1326.4	974
2024-12-01	1339.1	1254.8	1326.4	974
2024-11-01	1339.1	1254.8	1326.4	974
2024-10-01	1339.1	1254.8	1326.4	974
2024-09-01	1328.2	1254.8	1309.5	974
2024-08-01	1347	1251.2	1309.5	974
2024-07-01	1347	1251.2	1309.5	974
2024-06-01	1347	1251.2	1309.5	974
2024-08-01	1347	1251.2	1309.5	974
2024-04-01	1347	1251.2	1309.5	974
2024-03-01	1347	1251.2	1309.5	974
2024-02-01	1347	1251.2	1309.5	974
2024-01-01	1347	1251.2	1309.5	974
2023-12-01	1347	1251.2	1309.5	974
2023-11-01	1347	1251.2	1309.5	974

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	Rooibos Open 2025 (Elite)	2025-08-30	2025-08-30	Standard	West Coast (WCU)	5	5	1.5	Yes	Analysis
2	Western Cape Women�s Championship 2025 (Sunday Rapid)	2025-08-10	2025-08-10	Rapid	West Coast (WCU)	5	5	3	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Rooibos Open 2025 (Elite)	2025-08-30	2025-08-30	Standard	West Coast (WCU)	5	5	1.5	Yes	Analysis
2	Western Cape Women�s Championship 2025 (Sunday Rapid)	2025-08-10	2025-08-10	Rapid	West Coast (WCU)	5	5	3	Yes	Analysis
3	The Rooibos Open 2024 (Elite)	2024-08-24	2024-08-24	Rapid	West Coast (WCU)	5	5	3	Yes	Analysis
4	Western Cape Women�s Championship 2024 (Intermediate)	2024-08-10	2024-08-10	Standard	West Coast (WCU)	5	5	2.5	Yes	Analysis
5	Basil Ellman Rapid 2023 (B)	2023-09-30	2023-09-30	Rapid	West Coast (WCU)	5	5	4.5	Yes	Analysis
6	Western Cape Woman`s Championship 2022 (Open)	2022-09-02	2022-09-04	Standard	West Coast (WCU)	5	5	4	Yes	Analysis
7	Deep Blue Chess Club 2022 (Elite)	2022-08-20	2022-08-20	Rapid	West Coast (WCU)	5	5	3	Yes	Analysis
8	Onder-Weskus Top Skole 2022 (Hoerskool)	2022-06-04	2022-06-04	Rapid	West Coast (WCU)	5	4	3	Yes	Analysis
9	Basil Ellman Annual Rapid 2022 (Bear 2)	2022-06-25	2022-06-25	Rapid	West Coast (WCU)	5	5	2	Yes	Analysis
10	Western Cape Schools Chess 2022 (U18 Boys)	2022-05-07	2022-05-08	Standard	Eden (WEG)	6	6	2.5	Yes	Analysis
11	West Coast Schools Prestige 2022 (U18 Boys)	2022-02-19	2022-02-19	Standard	West Coast (WCU)	6	6	4	Yes	Analysis
12	Western Cape Women`s Month Tournament 2021 (Championship)	2021-08-06	2021-08-09	Standard	West Coast (WCU)	6	5	2	Yes	Analysis
13	West Coast Open 2021 (Open)	2021-06-26	2021-06-26	Rapid	West Coast (WCU)	6	5	4	Yes	Analysis
14	Lower West Coast 2021 (U18 Boys)	2021-04-10	2021-04-10	Rapid	West Coast (WCU)	5	5	4	Yes	Analysis
15	Lower West Coast 2021 (U18 Boys)	2021-04-10	2021-04-10	Rapid	West Coast (WCU)	5	1	0	Yes	Analysis
16	West Coast Schools Prestige 2020 (U15 Boys)	2020-03-07	2020-03-07	Rapid	West Coast (WCU)	5	5	2	Yes	Analysis
17	Onder Weskus Prestige 2020 (U15 Boys)	2020-02-15	2020-02-22	Standard	West Coast (WCU)	6	5	3	Yes	Analysis
18	West Coast Club Champs 2019 (A)	2019-09-13	2019-09-14	Standard	West Coast (WCU)	5	5	2	Yes	Analysis
19	Western Cape Womans Month Tournament 2019 (C)	2019-08-09	2019-08-11	Standard	West Coast (WCU)	7	6	4	Yes	Analysis
20	Weskus Topskole 2019 (U15)	2019-07-20	2019-07-20	Rapid	West Coast (WCU)	5	5	3	Yes	Analysis
21	Onder-Weskus Skole Proewe 2019 (O15 Seuns)	2019-02-16	2019-02-23	Rapid	West Coast (WCU)	8	7	2	Yes	Analysis

#	Games	Start				End
1	10	Tournament Western Cape Woman`s Championship 2022				Tournament Western Cape Women�s Championship 2024
		date 2022-09-03	rnd 2	type Standard	result 1	date 2024-08-10	rnd 1	type Standard	result 1
		Opponent Karelse, R (Ricardiano)				Opponent Lukas, J (Jaymilee)
2	6	Tournament Western Cape Women`s Month Tournament 2021				Tournament West Coast Schools Prestige 2022
		date 2021-08-07	rnd 3	type Standard	result 0.5	date 2022-02-19	rnd 3	type Standard	result 1
		Opponent Minnaar, E (Ethan)				Opponent Spamer, JH (Jan-Hendre)
3	5	Tournament Lower West Coast 2021				Tournament West Coast Open 2021
		date 2021-04-10	rnd 5	type Rapid	result 1	date 2021-06-26	rnd 5	type Rapid	result 1
		Opponent Bezuidenhoudt, K (Keanu)				Opponent Linnert, M (Marshall)

#	Games	Start				End
1	6	Tournament Western Cape Women`s Month Tournament 2021				Tournament West Coast Schools Prestige 2022
		date 2021-08-07	rnd 3	type Standard	result 0.5	date 2022-02-19	rnd 3	type Standard	result 1
		Opponent Minnaar, E (Ethan)				Opponent Spamer, JH (Jan-Hendre)
2	5	Tournament Western Cape Woman`s Championship 2022				Tournament Western Cape Women�s Championship 2024
		date 2022-09-03	rnd 2	type Standard	result 1	date 2024-08-10	rnd 1	type Standard	result 1
		Opponent Karelse, R (Ricardiano)				Opponent Lukas, J (Jaymilee)
3	3	Tournament Onder Weskus Prestige 2020				Tournament Onder Weskus Prestige 2020
		date 2020-02-22	rnd 4	type Standard	result 1	date 2020-02-22	rnd 6	type Standard	result 1
		Opponent Van Zyl, X (Xander)				Opponent Hogan, L (Lee)

#	Games	Start				End
1	10	Tournament Deep Blue Chess Club 2022				Tournament The Rooibos Open 2024
		date 2022-08-20	rnd 2	type Rapid	result 1	date 2024-08-24	rnd 1	type Rapid	result 1
		Opponent Floris, IC (Isaac)				Opponent Johnson, J (Jerolin)
2	5	Tournament Lower West Coast 2021				Tournament West Coast Open 2021
		date 2021-04-10	rnd 5	type Rapid	result 1	date 2021-06-26	rnd 5	type Rapid	result 1
		Opponent Bezuidenhoudt, K (Keanu)				Opponent Linnert, M (Marshall)
3	3	Tournament Onder-Weskus Top Skole 2022				Tournament Onder-Weskus Top Skole 2022
		date 2022-06-04	rnd 2	type Rapid	result 1	date 2022-06-04	rnd 4	type Rapid	result 1
		Opponent Hogan, L (Lee)				Opponent Farao, A (Adrian)

No games found.

#	Games	Start				End

#	Games	Start				End
1	6	Tournament Western Cape Woman`s Championship 2022				Tournament Basil Ellman Rapid 2023
		date 2022-09-03	rnd 2	type Standard	result 1	date 2023-09-30	rnd 2	type Rapid	result 1
		Opponent Karelse, R (Ricardiano)				Opponent De Bruin, M (Matthew)
2	5	Tournament Lower West Coast 2021				Tournament West Coast Open 2021
		date 2021-04-10	rnd 5	type Rapid	result 1	date 2021-06-26	rnd 5	type Rapid	result 1
		Opponent Bezuidenhoudt, K (Keanu)				Opponent Linnert, M (Marshall)
3	4	Tournament Western Cape Schools Chess 2022				Tournament Onder-Weskus Top Skole 2022
		date 2022-05-08	rnd 6	type Standard	result 1	date 2022-06-04	rnd 4	type Rapid	result 1
		Opponent Tyindi, L (Luvuyo)				Opponent Farao, A (Adrian)

#	Games	Start				End
1	5	Tournament Western Cape Woman`s Championship 2022				Tournament Western Cape Women�s Championship 2024
		date 2022-09-03	rnd 2	type Standard	result 1	date 2024-08-10	rnd 1	type Standard	result 1
		Opponent Karelse, R (Ricardiano)				Opponent Lukas, J (Jaymilee)
2	4	Tournament Western Cape Women`s Month Tournament 2021				Tournament West Coast Schools Prestige 2022
		date 2021-08-08	rnd 5	type Standard	result 1	date 2022-02-19	rnd 3	type Standard	result 1
		Opponent Qeqe, N (Ncabakazi)				Opponent Spamer, JH (Jan-Hendre)
3	3	Tournament Onder Weskus Prestige 2020				Tournament Onder Weskus Prestige 2020
		date 2020-02-22	rnd 4	type Standard	result 1	date 2020-02-22	rnd 6	type Standard	result 1
		Opponent Van Zyl, X (Xander)				Opponent Hogan, L (Lee)

#	Games	Start				End
1	5	Tournament Lower West Coast 2021				Tournament West Coast Open 2021
		date 2021-04-10	rnd 5	type Rapid	result 1	date 2021-06-26	rnd 5	type Rapid	result 1
		Opponent Bezuidenhoudt, K (Keanu)				Opponent Linnert, M (Marshall)
2	3	Tournament Basil Ellman Rapid 2023				Tournament The Rooibos Open 2024
		date 2023-09-30	rnd 4	type Rapid	result 1	date 2024-08-24	rnd 1	type Rapid	result 1
		Opponent Willemse, S (Schalk)				Opponent Johnson, J (Jerolin)
3	3	Tournament Deep Blue Chess Club 2022				Tournament Basil Ellman Rapid 2023
		date 2022-08-20	rnd 5	type Rapid	result 1	date 2023-09-30	rnd 2	type Rapid	result 1
		Opponent Ellman, A (Anne-Belle)				Opponent De Bruin, M (Matthew)

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	Kariem ,S (Shakir)	4	0.5	-318.8	3	0	-425	1	0.5	0	0	0	0
1	Kariem ,S (Shakir)	4	1445.6	1126.8	3	1424.6	1020.6	1	1324.1	1445.6	0	0	0
2	Hogan ,L (Lee)	3	2	141.7	1	1	425	2	1	0	0	0	0
2	Hogan ,L (Lee)	3	1125.5	1267.1	1	1128	1550.5	2	1148.4	1125.5	0	0	0
3	Schroeder ,C (Carl)	3	1	-141.7	0	0	0	3	1	-141.7	0	0	0
3	Schroeder ,C (Carl)	3	1349.8	1208.1	0	0	0	3	1256	1208.1	0	0	0
4	Minnaar ,E (Ethan)	2	0.5	-212.5	2	0.5	-212.5	0	0	0	0	0	0
4	Minnaar ,E (Ethan)	2	1398.8	1186.2	2	1355.6	1186.2	0	0	0	0	0	0
5	Lewaks ,S (Shaundre)	2	1	0	2	1	0	0	0	0	0	0	0
5	Lewaks ,S (Shaundre)	2	1507.2	1507.2	2	1479.2	1507.2	0	0	0	0	0	0
6	Galant ,R (Rozaan)	2	2	425	1	1	425	1	1	425	0	0	0
6	Galant ,R (Rozaan)	2	1272.9	1697.9	1	983.6	1697.9	1	980.4	1697.9	0	0	0
7	Hendricks ,M (Marquin)	2	1	0	1	0	-425	1	1	425	0	0	0
7	Hendricks ,M (Marquin)	2	1241.8	1241.8	1	1122.6	816.8	1	1071.8	1666.8	0	0	0
8	Syster ,E (Eden)	2	1.5	212.5	1	1	425	1	0.5	0	0	0	0
8	Syster ,E (Eden)	2	1279.4	1491.9	1	1339	1704.4	1	1213	1279.4	0	0	0
9	Van Wyk ,C (Charlton)	2	1	0	0	0	0	2	1	0	0	0	0
9	Van Wyk ,C (Charlton)	2	1200	1200	0	0	0	2	1200	1200	0	0	0
10	Williams ,V (Vogan)	2	0	-425	0	0	0	2	0	-425	0	0	0
10	Williams ,V (Vogan)	2	1122.5	697.5	0	0	0	2	1092.2	697.5	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

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Personal

Williams, S (Sergio)

Ratings

Game statistics

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Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms