Chess South Africa Ratings Database

PLAYER PAGE

Personal

Rock, M (Mieke)

Chess SA id

2110159246

FIDE id

Date of birth

2011-12-20 (U16)

Gender

Female

Region

Overberg (WOS)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-08-30

Personal details last changed

1900-01-01

Junior GPX Games

19.7

Junior GPX Points

1069.4

Item	Main	Standard	Rapid	Blitz
Rating	1211.9	1139.1	1250.2	1200
Raw rating	1211.9	1139.1	1250.2	1200
Weighted rating	1176.8	1138.3	1212.8	1200
Weighted performance	1166.7	1008	1217.1	0
Floor	711.9	700	750.2	700
K-factor	36	36	36	36
Min/Max rating change allowed	163	180.8	154.4	165.8
Highest rating	1211.9 2025-09-01	1200 2018-10-01	1264.2 2023-10-01	1200 2018-10-01
Highest raw rating	1211.9 2025-09-01	1200 2019-12-01	1250.2 2025-09-01	1200 2024-03-01
Highest weighted rating	1200.3 2018-10-01	1200 2018-10-01	1221.6 2024-09-01	1200 2018-10-01
Highest weighted performance	1200 2019-12-01	1200 2019-12-01	1264.2 2023-10-01	1200 2024-03-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1211.9	1139.1	1250.2	1200
Analysis
Rating	1211.9	1139.1	1250.2	1200
Raw rating	1211.9	1139.1	1250.2	1200
Weighted rating	1176.8	1138.3	1212.8
Weighted performance	1166.7	1008	1217.1
K-factor	36	36	36	36
Floor	711.9	700	750.2	700
Max/Min rating change allowed	163	180.8	154.4	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	1211.9	1139.1	1250.2	1200
New weighted rating	1180.1	1138.3	1216.2	1200
New weighted performance	1166.3	1007.6	1216.7	0
Temp new rating	1211.9	1139.1	1250.2	1200
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1211.9	1139.1	1250.2	1200
New K-factor	36	36	36	36
New floor	711.9	700	750.2	700

Item	Main	Standard	Rapid
	0	0	0
	35	5	30
	54	31	23
	8	3	5
	0	0	0
	0	0	0
History	97	39	58

Games since
	Main 94	Standard 36		Rapid 58		Blitz 0
Gender	Female
Age group	U16
Region	Overberg (WOS)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	3956		1314		122
Female	942		387		46
U16	638		224		19
U16 Female	194		82		10
Standard
	RSA		Province		Region
Overall	4223		1184		84
Female	1080		397		31
U16	678		209		15
U16 Female	206		79		9
Rapid
	RSA		Province		Region
Overall	1349		684		88
Female	266		153		30
U16	211		106		15
U16 Female	44		25		7
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	35	16	45.71	-36.4	1279.7	1243.3
Standard	5	1.5	30	-170	1239.6	1069.6
Rapid	30	14.5	48.33	-14.2	1286.4	1272.2
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	97	40.5	41.75	-70.1	1252	1181.9
Standard	39	11.5	29.49	-174.4	1260.5	1086.2
Rapid	58	29	50	0	1246.2	1246.2
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-09-30	1211.9	1139.1	1250.2	1200
2025-09-01	1211.9	1139.1	1250.2	1200
2025-08-01	1190.1	1139.1	1221.6	1200
2025-07-01	1190.1	1139.1	1221.6	1200
2025-06-01	1190.1	1139.1	1221.6	1200
2025-05-01	1166.9	1139.1	1201	1200
2025-04-01	1166.9	1138.7	1201	1200
2025-03-01	1189.3	1140.8	1200.9	1200
2025-02-01	1161.3	1140.8	1200.6	1200
2025-01-01	1154.2	1129.9	1194.6	1200
2024-12-01	1154.2	1129.9	1194.6	1200
2024-11-01	1154.2	1129.9	1194.6	1200
2024-10-01	1154.2	1129.9	1194.6	1200
2024-09-01	1166.5	1147.8	1211.9	1200
2024-08-01	1166.5	1147.8	1211.9	1200
2024-07-01	1142.9	1112.2	1211.9	1200
2024-06-01	1142.9	1112.2	1211.9	1200
2024-08-01	1200.3	1175.2	1211.9	1200
2024-04-01	1185.7	1175.2	1184.5	1200
2024-03-01	1153.7	1140.6	1184.1	1200
2024-02-01	1153.7	1140.6	1184.1	1200
2024-01-01	1161.8	1140.6	1209.7	1200
2023-12-01	1161.8	1140.6	1209.7	1200
2023-11-01	1161.8	1140.6	1209.7	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	Kleinmond Chess Club Open 2025 (U14)	2025-08-30	2025-08-30	Rapid	Overberg (WOS)	6	6	3.5	Yes	Analysis
2	Brave Knights Rapid 2025 (Open)	2025-05-03	2025-05-03	Rapid	Cape Winelands (WCW)	6	6	3	Yes	Analysis
3	Overberg Schools - HS Closed 2025 (U15 Girls)	2025-03-22	2025-03-22	Standard	Overberg (WOS)	5	5	1.5	Yes	Analysis
4	Overberg Schools - HS Trials 2025 (U15 Girls)	2025-02-22	2025-02-22	Rapid	Overberg (WOS)	6	6	3	Yes	Analysis
5	Curro Hermanus Summer Open 2025 (U15)	2025-02-08	2025-02-08	Rapid	Overberg (WOS)	6	6	3	Yes	Analysis
6	Overberg Schools & Federation Open 2025 (U15)	2025-02-01	2025-02-01	Rapid	Overberg (WOS)	6	6	2	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Kleinmond Chess Club Open 2025 (U14)	2025-08-30	2025-08-30	Rapid	Overberg (WOS)	6	6	3.5	Yes	Analysis
2	Brave Knights Rapid 2025 (Open)	2025-05-03	2025-05-03	Rapid	Cape Winelands (WCW)	6	6	3	Yes	Analysis
3	Overberg Schools - HS Closed 2025 (U15 Girls)	2025-03-22	2025-03-22	Standard	Overberg (WOS)	5	5	1.5	Yes	Analysis
4	Overberg Schools - HS Trials 2025 (U15 Girls)	2025-02-22	2025-02-22	Rapid	Overberg (WOS)	6	6	3	Yes	Analysis
5	Curro Hermanus Summer Open 2025 (U15)	2025-02-08	2025-02-08	Rapid	Overberg (WOS)	6	6	3	Yes	Analysis
6	Overberg Schools & Federation Open 2025 (U15)	2025-02-01	2025-02-01	Rapid	Overberg (WOS)	6	6	2	Yes	Analysis
7	Overberg GP Invitational Day 2 2024 (B)	2024-09-27	2024-09-27	Standard	Overberg (WOS)	5	5	2	Yes	Analysis
8	Overberg GP Invitational Day 1 2024 (B)	2024-09-26	2024-09-26	Standard	Overberg (WOS)	5	5	2	Yes	Analysis
9	Kleinmond Chess Club Open 2024 (U14)	2024-09-07	2024-09-07	Rapid	Overberg (WOS)	6	6	3	Yes	Analysis
10	Western Cape Top Schools Championship 2024 (U13 Mixed)	2024-08-30	2024-09-01	Standard	Eden (WEG)	6	6	0	Yes	Analysis
11	Overberg Schools - Top Schools 2024 (U13 Mixed)	2024-07-27	2024-07-27	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
12	Western Cape PS Individuals Championship 2024 (U13 Girls)	2024-05-04	2024-05-05	Standard	West Coast (WCU)	6	5	0	Yes	Analysis
13	Hermanus Chess Club Open 2024 (Development)	2024-04-20	2024-04-20	Rapid	Overberg (WOS)	7	7	4	Yes	Analysis
14	Overberg Schools - PS Closed 2024 (U13 Girls)	2024-03-16	2024-03-16	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
15	Overberg Schools - PS Trials Region 3 2024 (U13 Girls)	2024-03-02	2024-03-02	Rapid	Overberg (WOS)	5	5	2.5	Yes	Analysis
16	Overberg Open Rapid 2024 (U13)	2024-01-27	2024-01-27	Rapid	Overberg (WOS)	5	5	2	Yes	Analysis
17	Kingsway Open 2023 (Beginners)	2023-10-28	2023-10-28	Rapid	Overberg (WOS)	5	5	3	Yes	Analysis
18	Overberg Top Schools 2023 (U13)	2023-08-05	2023-08-05	Standard	Overberg (WOS)	5	3	0	Yes	Analysis

#	Games	Start				End
1	4	Tournament Overberg Open Rapid 2024				Tournament Overberg Schools - PS Trials Region 3 2024
		date 2024-01-27	rnd 5	type Rapid	result 1	date 2024-03-02	rnd 3	type Rapid	result 1
		Opponent Otto, J (Johanne)				Opponent Otto, J (Johanne)
2	3	Tournament Curro Hermanus Summer Open 2025				Tournament Curro Hermanus Summer Open 2025
		date 2025-02-08	rnd 2	type Rapid	result 1	date 2025-02-08	rnd 4	type Rapid	result 1
		Opponent Carstens, M (Mathys Johannes)				Opponent Lotter, M (Michael)
3	3	Tournament Kingsway Open 2023				Tournament Kingsway Open 2023
		date 2023-10-28	rnd 2	type Rapid	result 1	date 2023-10-28	rnd 4	type Rapid	result 1
		Opponent Mienie, M (Minki)				Opponent Viljoen, W (Wian)

#	Games	Start				End
1	2	Tournament Overberg GP Invitational Day 2 2024				Tournament Overberg GP Invitational Day 2 2024
		date 2024-09-27	rnd 3	type Standard	result 1	date 2024-09-27	rnd 4	type Standard	result 1
		Opponent Otto, K (Karlien)				Opponent Collins, E (Esme)
2	2	Tournament Overberg GP Invitational Day 1 2024				Tournament Overberg GP Invitational Day 1 2024
		date 2024-09-26	rnd 2	type Standard	result 1	date 2024-09-26	rnd 3	type Standard	result 1
		Opponent Prins, C (Christiaan)				Opponent Buhr, G (Gretchen)
3	2	Tournament Overberg Schools - Top Schools 2024				Tournament Overberg Schools - Top Schools 2024
		date 2024-07-27	rnd 1	type Standard	result 1	date 2024-07-27	rnd 2	type Standard	result 1
		Opponent Henn, E (Enwill)				Opponent Lingenfelder, I (Isebella)

#	Games	Start				End
1	4	Tournament Overberg Open Rapid 2024				Tournament Overberg Schools - PS Trials Region 3 2024
		date 2024-01-27	rnd 5	type Rapid	result 1	date 2024-03-02	rnd 3	type Rapid	result 1
		Opponent Otto, J (Johanne)				Opponent Otto, J (Johanne)
2	3	Tournament Curro Hermanus Summer Open 2025				Tournament Curro Hermanus Summer Open 2025
		date 2025-02-08	rnd 2	type Rapid	result 1	date 2025-02-08	rnd 4	type Rapid	result 1
		Opponent Carstens, M (Mathys Johannes)				Opponent Lotter, M (Michael)
3	3	Tournament Kingsway Open 2023				Tournament Kingsway Open 2023
		date 2023-10-28	rnd 2	type Rapid	result 1	date 2023-10-28	rnd 4	type Rapid	result 1
		Opponent Mienie, M (Minki)				Opponent Viljoen, W (Wian)

No games found.

#	Games	Start				End

#	Games	Start				End
1	3	Tournament Curro Hermanus Summer Open 2025				Tournament Curro Hermanus Summer Open 2025
		date 2025-02-08	rnd 2	type Rapid	result 1	date 2025-02-08	rnd 4	type Rapid	result 1
		Opponent Carstens, M (Mathys Johannes)				Opponent Lotter, M (Michael)
2	3	Tournament Kingsway Open 2023				Tournament Kingsway Open 2023
		date 2023-10-28	rnd 2	type Rapid	result 1	date 2023-10-28	rnd 4	type Rapid	result 1
		Opponent Mienie, M (Minki)				Opponent Viljoen, W (Wian)
3	2	Tournament Kleinmond Chess Club Open 2025				Tournament Kleinmond Chess Club Open 2025
		date 2025-08-30	rnd 4	type Rapid	result 1	date 2025-08-30	rnd 5	type Rapid	result 1
		Opponent Jiri, H (Howard)				Opponent Reynecke, K (Kiana)

#	Games	Start				End
1	2	Tournament Overberg GP Invitational Day 2 2024				Tournament Overberg GP Invitational Day 2 2024
		date 2024-09-27	rnd 3	type Standard	result 1	date 2024-09-27	rnd 4	type Standard	result 1
		Opponent Otto, K (Karlien)				Opponent Collins, E (Esme)
2	2	Tournament Overberg GP Invitational Day 1 2024				Tournament Overberg GP Invitational Day 1 2024
		date 2024-09-26	rnd 2	type Standard	result 1	date 2024-09-26	rnd 3	type Standard	result 1
		Opponent Prins, C (Christiaan)				Opponent Buhr, G (Gretchen)
3	2	Tournament Overberg Schools - Top Schools 2024				Tournament Overberg Schools - Top Schools 2024
		date 2024-07-27	rnd 1	type Standard	result 1	date 2024-07-27	rnd 2	type Standard	result 1
		Opponent Henn, E (Enwill)				Opponent Lingenfelder, I (Isebella)

#	Games	Start				End
1	3	Tournament Curro Hermanus Summer Open 2025				Tournament Curro Hermanus Summer Open 2025
		date 2025-02-08	rnd 2	type Rapid	result 1	date 2025-02-08	rnd 4	type Rapid	result 1
		Opponent Carstens, M (Mathys Johannes)				Opponent Lotter, M (Michael)
2	3	Tournament Kingsway Open 2023				Tournament Kingsway Open 2023
		date 2023-10-28	rnd 2	type Rapid	result 1	date 2023-10-28	rnd 4	type Rapid	result 1
		Opponent Mienie, M (Minki)				Opponent Viljoen, W (Wian)
3	2	Tournament Kleinmond Chess Club Open 2025				Tournament Kleinmond Chess Club Open 2025
		date 2025-08-30	rnd 4	type Rapid	result 1	date 2025-08-30	rnd 5	type Rapid	result 1
		Opponent Jiri, H (Howard)				Opponent Reynecke, K (Kiana)

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	Lotter ,M (Michael)	4	1	-212.5	2	0	-425	2	1	0	0	0	0
1	Lotter ,M (Michael)	4	1374.2	1161.7	2	1354.8	949.2	2	1305.4	1374.2	0	0	0
2	Prins ,C (Christiaan)	3	1	-141.7	3	1	-141.7	0	0	0	0	0	0
2	Prins ,C (Christiaan)	3	1223.7	1082	3	1209.4	1082	0	0	0	0	0	0
3	Van Der Westhuizen ,M (Mika)	3	0	-425	3	0	-425	0	0	0	0	0	0
3	Van Der Westhuizen ,M (Mika)	3	1412.9	987.9	3	1458.7	987.9	0	0	0	0	0	0
4	Buhr ,G (Gretchen)	3	1	-141.7	3	1	-141.7	0	0	0	0	0	0
4	Buhr ,G (Gretchen)	3	1277.3	1135.6	3	1282.1	1135.6	0	0	0	0	0	0
5	Van Der Linde ,L (Luandi)	3	0	-425	1	0	-425	2	0	-425	0	0	0
5	Van Der Linde ,L (Luandi)	3	1391.2	966.2	1	1467.3	966.2	2	1254.4	966.2	0	0	0
6	Nel ,A (Anika)	2	1	0	2	1	0	0	0	0	0	0	0
6	Nel ,A (Anika)	2	1119.2	1119.2	2	1084.2	1119.2	0	0	0	0	0	0
7	Pieper ,Q (Qiella)	2	0.5	-212.5	1	0	-425	1	0.5	0	0	0	0
7	Pieper ,Q (Qiella)	2	1251.8	1039.3	1	1272.4	826.8	1	1170.8	1251.8	0	0	0
8	Magida ,S (Sinawo)	2	0	-425	1	0	-425	1	0	-425	0	0	0
8	Magida ,S (Sinawo)	2	1422.1	997.1	1	1449.1	997.1	1	1281.5	997.1	0	0	0
9	Booysen ,J (Joseph)	2	1	0	0	0	0	2	1	0	0	0	0
9	Booysen ,J (Joseph)	2	1190	1190	0	0	0	2	1215.5	1190	0	0	0
10	D`Ambrosio ,D (Djuna)	2	0	-425	0	0	0	2	0	-425	0	0	0
10	D`Ambrosio ,D (Djuna)	2	1167.3	742.3	0	0	0	2	1155.8	742.3	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

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PLAYER PAGE

Personal

Rock, M (Mieke)

Ratings

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Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms