Chess South Africa Ratings Database

PLAYER PAGE

Personal

Nelson, OS (Olenka Shai)

Chess SA id

2070096496

FIDE id

Date of birth

2007-11-01 (U20)

Gender

Female

Region

Cape Town (WCT)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-12-17

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1229.7	1175.5	1279.9	1200
Raw rating	1229.7	1175.5	1279.9	1200
Weighted rating	1200.9	1158.2	1199.2	1200
Weighted performance	1174.4	1116.8	1136.1	0
Floor	850.1	790	779.9	700
K-factor	36	36	36	36
Min/Max rating change allowed	158.9	171.7	148	165.8
Highest rating	1350.1 2025-09-01	1290 2025-09-30	1279.9 2026-01-01	1200 2018-10-01
Highest raw rating	1350.1 2025-09-01	1290 2025-09-30	1279.9 2026-01-01	1200 2024-03-01
Highest weighted rating	1333.5 2018-02-01	1237.5 2018-02-01	1233.1 2024-05-01	1200 2018-10-01
Highest weighted performance	1333.5 2025-07-01	1237.5 2024-12-01	1260.7 2018-09-01	1200 2024-03-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	4.2	12.6	0	0
New rating	1233.9	1188.1	1279.9	1200
Analysis
Rating	1229.7	1175.5	1279.9	1200
Raw rating	1229.7	1175.5	1279.9	1200
Weighted rating	1200.9	1158.2	1199.2
Weighted performance	1174.4	1116.8	1136.1
K-factor	36	36	36	36
Floor	850.1	790	779.9	700
Max/Min rating change allowed	158.9	171.7	148	165.8
Games	5	5	0	0
Score	2	2	0	0
Expected score	1.88	1.65	0	0
Score-Expected	0.12	0.35	0	0
Temp raw +/-	4.2	12.6	0	0
Final raw +/-	4.2	12.6	0	0
New raw rating	1233.9	1188.1	1279.9	1200
New weighted rating	1206.7	1163.3	1206.7	1200
New weighted performance	1203.9	1139.2	1127.8	0
Temp new rating	1233.9	1188.1	1279.9	1200
Temp new rating +/-	4.2	12.6	0	0
Final new rating +/-	4.2	12.6	0	0
New rating	1233.9	1188.1	1279.9	1200
New K-factor	36	36	36	36
New floor	850.1	790	779.9	700

Item	Main	Standard	Rapid
	0	0	0
	56	43	13
	15	6	9
	5	5	0
	0	0	0
	0	0	0
History	87	59	28

Games since
	Main 71	Standard 49		Rapid 22		Blitz 0
Gender	Female
Age group	U20
Region	Cape Town (WCT)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	3535		1166		462
Female	756		300		95
U20	245		89		35
U20 Female	54		15		7
Standard
	RSA		Province		Region
Overall	3938		1119		457
Female	920		338		113
U20	274		98		37
U20 Female	67		22		8
Rapid
	RSA		Province		Region
Overall	1470		725		288
Female	292		158		37
U20	82		44		18
U20 Female	13		5		3
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Female	-1		-1		-1
U20	-1		-1		-1
U20 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	56	27	48.21	-15.2	1267.3	1252.1
Standard	43	19	44.19	-49.4	1253.3	1203.9
Rapid	13	8	61.54	98.1	1313.5	1411.6
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	87	37	42.53	-63.5	1236.4	1172.9
Standard	59	23	38.98	-93.6	1220.9	1127.2
Rapid	28	14	50	0	1269.1	1269.1
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2026-01-01	1229.7	1175.5	1279.9	1200
2025-11-30	1272.4	1216.5	1237.1	1200
2025-11-01	1272.4	1216.5	1237.1	1200
2025-09-30	1345.4	1290	1237.1	1200
2025-09-01	1350.1	1285.3	1237.1	1200
2025-08-01	1330.9	1237.5	1237.1	1200
2025-07-01	1333.5	1237.5	1233.1	1200
2025-06-01	1124	1116.3	1168.5	1200
2025-05-01	1124	1116.3	1168.5	1200
2025-04-01	1124	1116.3	1168.5	1200
2025-03-01	1118.8	1098.8	1168.5	1200
2025-02-01	1101.1	1070.2	1167.4	1200
2025-01-01	1086.3	1064	1134.6	1200
2024-12-01	1086.3	1064	1134.6	1200
2024-11-01	1086.3	1064	1134.6	1200
2024-10-01	1086.3	1064	1134.6	1200
2024-09-01	1086.3	1064	1134.6	1200
2024-11-01	1086.3	1064	1134.6	1200
2024-07-01	1086.3	1064	1134.6	1200
2024-06-01	1086.3	1064	1134.6	1200
2024-05-01	1120.4	1064	1223.9	1200
2024-04-01	1102.3	1064	1215.6	1200
2024-03-01	1127	1084.4	1215.6	1200
2024-02-01	1127	1084.4	1215.6	1200

Comming soon.

Tournaments

History

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Helderberg Chess Club Open 2026 (B)	2026-01-17	2026-01-17	Standard	Cape Town (WCT)	5	5	2	Yes	Analysis

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Helderberg Chess Club Open 2026 (B)	2026-01-17	2026-01-17	Standard	Cape Town (WCT)	5	5	2	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Helderberg Chess Club Open 2026 (B)	2026-01-17	2026-01-17	Standard	Cape Town (WCT)	5	5	2	Yes	Analysis
2	Four Seasons Summer Slam 2025 (Open)	2025-12-10	2025-12-10	Rapid	Cape Town (WCT)	6	6	4	Yes	Analysis
3	2025 Mzansi Inter Provincial Team Championships (U20 Girls)	2025-12-15	2025-12-17	Standard	Nelson Mandela Bay (ENM)	6	6	2	Yes	Analysis
4	Kraaifontein Open 2025 (Intermediate)	2025-12-06	2025-12-07	Standard	Cape Town (WCT)	6	5	1	Yes	Analysis
5	UCT Open Chess Championship 2025 (Intermediate)	2025-10-11	2025-10-12	Standard	Cape Town (WCT)	6	5	1	Yes	Analysis
6	Western Cape Schools - Top Schools 2025 (U19 Girls)	2025-09-06	2025-09-07	Standard	Overberg (WOS)	6	6	4	Yes	Analysis
7	CT Metro District East Top Schools Chess 2025 (U15-U19 Girls)	2025-08-02	2025-08-03	Standard	Cape Town (WCT)	6	6	4.5	Yes	Analysis
8	4th Curro Durbanville Rapid Open 2025 (Intermediate)	2025-07-19	2025-07-19	Rapid	Cape Town (WCT)	7	7	4	Yes	Analysis
9	Cape Winelands Queens 2025 (Open)	2025-06-21	2025-06-21	Rapid	Cape Winelands (WCW)	6	6	4	Yes	Analysis
10	Cape Town Chess Junior League 2025 (U18)	2025-05-10	2025-05-31	Standard	Cape Town (WCT)	6	2	1.5	Yes	Analysis
11	Cape Town Open Chess Festival 2025 (C)	2025-03-22	2025-03-23	Standard	Cape Town (WCT)	6	6	2	Yes	Analysis
12	Western Cape Closed 2025 (C)	2025-03-08	2025-03-09	Standard	Cape Town (WCT)	6	6	2.5	Yes	Analysis
13	CT Metro Schools Individual Closed 2025 (U19 Girls)	2025-03-01	2025-03-02	Standard	Cape Town (WCT)	6	6	1	Yes	Analysis
14	CT Metro District East Schools Chess Individuals Trials 2025 (U18+U20 Girls)	2025-02-01	2025-02-02	Standard	Cape Town (WCT)	6	6	2.5	Yes	Analysis
15	Cape Town Junior League Finals 2024 (U18 Open A)	2024-05-18	2024-05-18	Rapid	Cape Town (WCT)	5	5	0	Yes	Analysis
16	Cape Town Junior League Qualifier 2024 (U18 Open)	2024-04-06	2024-04-06	Rapid	Cape Town (WCT)	6	4	2	Yes	Analysis
17	Cape Town Open Chess Championship 2024 (Beginner)	2024-03-16	2024-03-17	Standard	Cape Town (WCT)	6	6	2	Yes	Analysis
18	Cape Town Open 2023 (Intermediate)	2023-03-25	2023-03-26	Standard	Cape Town (WCT)	6	5	1	Yes	Analysis
19	Stellenbosch Primary 2018 (U12)	2018-09-15	2018-09-15	Rapid	Cape Winelands (WCW)	7	6	4	Yes	Analysis
20	District East Schools Chess Open Trials 2018 (U11)	2018-02-02	2018-02-03	Standard	Cape Town (WCT)	6	5	1	Yes	Analysis

#	Games	Start				End
1	6	Tournament 4th Curro Durbanville Rapid Open 2025				Tournament CT Metro District East Top Schools Chess 2025
		date 2025-07-19	rnd 7	type Rapid	result 1	date 2025-08-03	rnd 5	type Standard	result 0.5
		Opponent Kieser, M (Michael)				Opponent Mutumbi, M (Melisa)
2	5	Tournament Cape Town Chess Junior League 2025				Tournament Cape Winelands Queens 2025
		date 2025-05-10	rnd 2	type Standard	result 1	date 2025-06-21	rnd 3	type Rapid	result 1
		Opponent Smith, W (Willow)				Opponent Cupido, C (Caylah)
3	3	Tournament Western Cape Schools - Top Schools 2025				Tournament Western Cape Schools - Top Schools 2025
		date 2025-09-06	rnd 2	type Standard	result 1	date 2025-09-06	rnd 4	type Standard	result 1
		Opponent Prins, F (Florenique)				Opponent Du Buisson, A (Ava)

#	Games	Start				End
1	7	Tournament Cape Town Chess Junior League 2025				Tournament CT Metro District East Top Schools Chess 2025
		date 2025-05-10	rnd 2	type Standard	result 1	date 2025-08-03	rnd 5	type Standard	result 0.5
		Opponent Smith, W (Willow)				Opponent Mutumbi, M (Melisa)
2	4	Tournament Cape Town Open Chess Championship 2024				Tournament CT Metro District East Schools Chess Individuals Trials 2025
		date 2024-03-17	rnd 5	type Standard	result 1	date 2025-02-01	rnd 2	type Standard	result 0.5
		Opponent Chamberlain, E (Eduan)				Opponent Pretorius, A (Amanda Karen)
3	3	Tournament Western Cape Schools - Top Schools 2025				Tournament Western Cape Schools - Top Schools 2025
		date 2025-09-06	rnd 2	type Standard	result 1	date 2025-09-06	rnd 4	type Standard	result 1
		Opponent Prins, F (Florenique)				Opponent Du Buisson, A (Ava)

#	Games	Start				End
1	3	Tournament Cape Winelands Queens 2025				Tournament Cape Winelands Queens 2025
		date 2025-06-21	rnd 1	type Rapid	result 1	date 2025-06-21	rnd 3	type Rapid	result 1
		Opponent Van Zyl, C (Carien)				Opponent Cupido, C (Caylah)
2	3	Tournament Stellenbosch Primary 2018				Tournament Stellenbosch Primary 2018
		date 2018-09-15	rnd 4	type Rapid	result 1	date 2018-09-15	rnd 6	type Rapid	result 1
		Opponent Dafeti, D (Tumisang)				Opponent Rossouw, AJ (Aj)
3	2	Tournament 4th Curro Durbanville Rapid Open 2025				Tournament 4th Curro Durbanville Rapid Open 2025
		date 2025-07-19	rnd 4	type Rapid	result 1	date 2025-07-19	rnd 5	type Rapid	result 1
		Opponent Mziweni, S (Simehule)				Opponent Nomangola, A (Atile)

No games found.

#	Games	Start				End

#	Games	Start				End
1	5	Tournament 4th Curro Durbanville Rapid Open 2025				Tournament CT Metro District East Top Schools Chess 2025
		date 2025-07-19	rnd 7	type Rapid	result 1	date 2025-08-03	rnd 4	type Standard	result 1
		Opponent Kieser, M (Michael)				Opponent Menqe, S (Sinesipho)
2	3	Tournament Western Cape Schools - Top Schools 2025				Tournament Western Cape Schools - Top Schools 2025
		date 2025-09-06	rnd 2	type Standard	result 1	date 2025-09-06	rnd 4	type Standard	result 1
		Opponent Prins, F (Florenique)				Opponent Du Buisson, A (Ava)
3	3	Tournament Cape Winelands Queens 2025				Tournament Cape Winelands Queens 2025
		date 2025-06-21	rnd 1	type Rapid	result 1	date 2025-06-21	rnd 3	type Rapid	result 1
		Opponent Van Zyl, C (Carien)				Opponent Cupido, C (Caylah)

#	Games	Start				End
1	4	Tournament CT Metro District East Top Schools Chess 2025				Tournament CT Metro District East Top Schools Chess 2025
		date 2025-08-02	rnd 1	type Standard	result 1	date 2025-08-03	rnd 4	type Standard	result 1
		Opponent Fortuin, S (Sharonique)				Opponent Menqe, S (Sinesipho)
2	3	Tournament Western Cape Schools - Top Schools 2025				Tournament Western Cape Schools - Top Schools 2025
		date 2025-09-06	rnd 2	type Standard	result 1	date 2025-09-06	rnd 4	type Standard	result 1
		Opponent Prins, F (Florenique)				Opponent Du Buisson, A (Ava)
3	3	Tournament Cape Town Open Chess Championship 2024				Tournament CT Metro District East Schools Chess Individuals Trials 2025
		date 2024-03-17	rnd 5	type Standard	result 1	date 2025-02-01	rnd 1	type Standard	result 1
		Opponent Chamberlain, E (Eduan)				Opponent Van Heerden, W (Wanica Jordan-lee)

#	Games	Start				End
1	3	Tournament Cape Winelands Queens 2025				Tournament Cape Winelands Queens 2025
		date 2025-06-21	rnd 1	type Rapid	result 1	date 2025-06-21	rnd 3	type Rapid	result 1
		Opponent Van Zyl, C (Carien)				Opponent Cupido, C (Caylah)
2	3	Tournament Stellenbosch Primary 2018				Tournament Stellenbosch Primary 2018
		date 2018-09-15	rnd 4	type Rapid	result 1	date 2018-09-15	rnd 6	type Rapid	result 1
		Opponent Dafeti, D (Tumisang)				Opponent Rossouw, AJ (Aj)
3	2	Tournament 4th Curro Durbanville Rapid Open 2025				Tournament 4th Curro Durbanville Rapid Open 2025
		date 2025-07-19	rnd 4	type Rapid	result 1	date 2025-07-19	rnd 5	type Rapid	result 1
		Opponent Mziweni, S (Simehule)				Opponent Nomangola, A (Atile)

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	Mutumbi ,M (Melisa)	2	0.5	-212.5	2	0.5	-212.5	0	0	0	0	0	0
1	Mutumbi ,M (Melisa)	2	1225.2	1012.7	2	1239.2	1012.7	0	0	0	0	0	0
2	Fortuin ,S (Sharonique)	2	2	425	2	2	425	0	0	0	0	0	0
2	Fortuin ,S (Sharonique)	2	1199.5	1624.5	2	1199.4	1624.5	0	0	0	0	0	0
3	Menqe ,S (Sinesipho)	2	2	425	2	2	425	0	0	0	0	0	0
3	Menqe ,S (Sinesipho)	2	1200	1625	2	1200	1625	0	0	0	0	0	0
4	Tyokwana ,K (Khayone)	2	0	-425	1	0	-425	1	0	-425	0	0	0
4	Tyokwana ,K (Khayone)	2	1217.4	792.4	1	1176.1	792.4	1	1198.3	792.4	0	0	0
5	Zhu ,Z (Zhaonan)	2	1	0	1	1	425	1	0	-425	0	0	0
5	Zhu ,Z (Zhaonan)	2	1188.5	1188.5	1	1193.7	1613.5	1	1197.2	763.5	0	0	0
6	Thorpe ,C (Claire)	2	0	-425	1	0	-425	1	0	-425	0	0	0
6	Thorpe ,C (Claire)	2	1498.9	1073.9	1	1463.8	1073.9	1	1391	1073.9	0	0	0
7	Kruger ,D (Daniel)	2	0	-425	0	0	0	2	0	-425	0	0	0
7	Kruger ,D (Daniel)	2	1297.7	872.7	0	0	0	2	1282.4	872.7	0	0	0
8	Pretorius ,A (Amanda Karen)	1	0.5	0	1	0.5	0	0	0	0	0	0	0
8	Pretorius ,A (Amanda Karen)	1	1360.2	1360.2	1	1333.2	1360.2	0	0	0	0	0	0
9	Mayekiso ,A (Amila)	1	0.5	0	1	0.5	0	0	0	0	0	0	0
9	Mayekiso ,A (Amila)	1	1257.7	1257.7	1	1224.6	1257.7	0	0	0	0	0	0
10	Kraai ,T (Thamsanqa)	1	1	425	1	1	425	0	0	0	0	0	0
10	Kraai ,T (Thamsanqa)	1	1200	1625	1	1200	1625	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

Nelson, OS (Olenka Shai)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms