Chess South Africa Ratings Database

PLAYER PAGE

Personal

Grobbelaar, M (Marlo)

Chess SA id

1160159271

FIDE id

Date of birth

2016-01-07 (U10)

Gender

Male

Region

Overberg (WOS)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-09-20

Personal details last changed

1900-01-01

Junior GPX Games

32.2

Junior GPX Points

1121.1

Item	Main	Standard	Rapid	Blitz
Rating	1210.4	1197.2	1213.8	1200
Raw rating	1210.4	1197.2	1213.8	1200
Weighted rating	1195	1184.9	1211.3	1200
Weighted performance	1177.8	1148.7	1144.9	0
Floor	739.6	748.2	716.9	700
K-factor	36	36	36	36
Min/Max rating change allowed	163.4	166.5	162.6	165.8
Highest rating	1447.3 2023-09-01	1477.4 2023-09-01	1229.7 2023-10-01	1200 2018-10-01
Highest raw rating	1239.6 2024-04-01	1248.2 2024-04-01	1216.9 2024-04-01	1200 2024-03-01
Highest weighted rating	1239.6 2024-07-01	1248.2 2024-05-01	1211.3 2025-09-30	1200 2018-10-01
Highest weighted performance	1447.3 2023-09-01	1477.4 2023-09-01	1229.7 2023-10-01	1200 2024-03-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1210.4	1197.2	1213.8	1200
Analysis
Rating	1210.4	1197.2	1213.8	1200
Raw rating	1210.4	1197.2	1213.8	1200
Weighted rating	1195	1184.9	1211.3
Weighted performance	1177.8	1148.7	1144.9
K-factor	36	36	36	36
Floor	739.6	748.2	716.9	700
Max/Min rating change allowed	163.4	166.5	162.6	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	1210.4	1197.2	1213.8	1200
New weighted rating	1195.9	1185.2	1211.5	1200
New weighted performance	1177.4	1148.3	1144.5	0
Temp new rating	1210.4	1197.2	1213.8	1200
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1210.4	1197.2	1213.8	1200
New K-factor	36	36	36	36
New floor	739.6	748.2	716.9	700

Item	Main	Standard	Rapid
	0	0	0
	44	22	22
	35	20	15
	12	7	5
	0	0	0
	0	0	0
History	91	49	42

Games since
	Main 84	Standard 42		Rapid 42		Blitz 0
Gender	Male
Age group	U10
Region	Overberg (WOS)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	3967		1318		123
Male	2998		925		76
U10	364		125		20
U10 Male	280		89		15
Standard
	RSA		Province		Region
Overall	3956		1116		73
Male	2967		756		48
U10	372		110		15
U10 Male	288		77		11
Rapid
	RSA		Province		Region
Overall	1554		781		108
Male	1210		588		69
U10	147		76		22
U10 Male	110		57		17
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U10	-1		-1		-1
U10 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	44	20	45.45	-38.6	1261.3	1222.7
Standard	22	10	45.45	-38.6	1270.3	1231.6
Rapid	22	10	45.45	-38.6	1252.4	1213.8
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	91	40	43.96	-51.4	1245.4	1194
Standard	49	20.5	41.84	-69.4	1247.1	1177.7
Rapid	42	19.5	46.43	-30.4	1243.4	1213
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-09-30	1210.4	1197.2	1213.8	1200
2025-09-01	1218.5	1208.4	1212.3	1200
2025-08-01	1205.1	1188.7	1212.3	1200
2025-07-01	1205.1	1188.7	1212.3	1200
2025-06-01	1205.1	1188.7	1212.3	1200
2025-05-01	1223.9	1209.6	1212.3	1200
2025-04-01	1223.9	1209.6	1212.3	1200
2025-03-01	1194.1	1183.8	1212.3	1200
2025-02-01	1182.9	1179.9	1208.2	1200
2025-01-01	1130.6	1113.9	1205.4	1200
2024-12-01	1130.6	1113.9	1205.4	1200
2024-11-01	1130.6	1113.9	1205.4	1200
2024-10-01	1130.6	1113.9	1205.4	1200
2024-09-01	1187.9	1183	1216.9	1200
2024-08-01	1187.9	1183	1216.9	1200
2024-07-01	1210.3	1211.1	1216.9	1200
2024-06-01	1210.3	1211.1	1216.9	1200
2024-08-01	1239.6	1248.2	1216.9	1200
2024-04-01	1239.6	1248.2	1216.9	1200
2024-03-01	1218.3	1233.1	1200	1200
2024-02-01	1218.3	1233.1	1200	1200
2024-01-01	1222.5	1233.1	1205.4	1200
2023-12-01	1222.5	1233.1	1205.4	1200
2023-11-01	1222.5	1233.1	1205.4	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	Kingsway Chess Open 2025 (U10)	2025-09-20	2025-09-20	Rapid	Overberg (WOS)	6	5	2	Yes	Analysis
2	Western Cape Schools - Top Schools 2025 (U9)	2025-09-06	2025-09-07	Standard	Overberg (WOS)	6	6	2	Yes	Analysis
3	Overberg Top Schools 2025 (U7+U9)	2025-08-02	2025-08-02	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
4	Western Cape Schools Individual Championship 2025 (U9 Boys)	2025-05-17	2025-05-18	Standard	Cape Winelands (WCW)	6	6	2	Yes	Analysis
5	Overberg Schools - PS Closed 2025 (U9 Boys)	2025-03-08	2025-03-08	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
6	Overberg Schools - PS Trials (Region 1) 2025 (U9 Boys)	2025-02-22	2025-02-22	Rapid	Overberg (WOS)	6	6	3	Yes	Analysis
7	Curro Hermanus Summer Open 2025 (U9)	2025-02-08	2025-02-08	Rapid	Overberg (WOS)	6	6	3	Yes	Analysis
8	Overberg Schools & Federation Open 2025 (U9)	2025-02-01	2025-02-01	Rapid	Overberg (WOS)	6	5	2	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Kingsway Chess Open 2025 (U10)	2025-09-20	2025-09-20	Rapid	Overberg (WOS)	6	5	2	Yes	Analysis
2	Western Cape Schools - Top Schools 2025 (U9)	2025-09-06	2025-09-07	Standard	Overberg (WOS)	6	6	2	Yes	Analysis
3	Overberg Top Schools 2025 (U7+U9)	2025-08-02	2025-08-02	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
4	Western Cape Schools Individual Championship 2025 (U9 Boys)	2025-05-17	2025-05-18	Standard	Cape Winelands (WCW)	6	6	2	Yes	Analysis
5	Overberg Schools - PS Closed 2025 (U9 Boys)	2025-03-08	2025-03-08	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
6	Overberg Schools - PS Trials (Region 1) 2025 (U9 Boys)	2025-02-22	2025-02-22	Rapid	Overberg (WOS)	6	6	3	Yes	Analysis
7	Curro Hermanus Summer Open 2025 (U9)	2025-02-08	2025-02-08	Rapid	Overberg (WOS)	6	6	3	Yes	Analysis
8	Overberg Schools & Federation Open 2025 (U9)	2025-02-01	2025-02-01	Rapid	Overberg (WOS)	6	5	2	Yes	Analysis
9	Kingsway Chess Open 2024 (U8)	2024-09-14	2024-09-14	Rapid	Overberg (WOS)	6	5	2	Yes	Analysis
10	Western Cape Top Schools Championship 2024 (U9 Mixed)	2024-08-30	2024-09-01	Standard	Eden (WEG)	6	5	0	Yes	Analysis
11	Overberg Schools - Top Schools 2024 (U7+U9 Mixed)	2024-07-27	2024-07-27	Standard	Overberg (WOS)	5	5	2	Yes	Analysis
12	Western Cape PS Individuals Championship 2024 (U9 Boys)	2024-05-04	2024-05-05	Standard	West Coast (WCU)	6	5	1	Yes	Analysis
13	Overberg Schools - PS Closed 2024 (U9 Boys)	2024-03-16	2024-03-16	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
14	Overberg Schools - PS Trials Region 3 2024 (U9 Boys)	2024-03-02	2024-03-02	Rapid	Overberg (WOS)	5	5	3	Yes	Analysis
15	Overberg Open Rapid 2024 (U7+U9)	2024-01-27	2024-01-27	Rapid	Overberg (WOS)	5	5	2	Yes	Analysis
16	Kingsway Open 2023 (U8)	2023-10-28	2023-10-28	Rapid	Overberg (WOS)	5	5	2.5	Yes	Analysis
17	Western Cape Top Schools 2023 (U7 Mixed)	2023-09-02	2023-09-03	Standard	Cape Winelands (WCW)	5	2	2	Yes	Analysis
18	Overberg Top Schools 2023 (U7+U9)	2023-08-05	2023-08-05	Standard	Overberg (WOS)	5	5	2.5	Yes	Analysis

#	Games	Start				End
1	6	Tournament Overberg Top Schools 2023				Tournament Kingsway Open 2023
		date 2023-08-05	rnd 4	type Standard	result 0.5	date 2023-10-28	rnd 2	type Rapid	result 1
		Opponent Le Roux, C (Carmen)				Opponent Du Preez, J (Janco)
2	4	Tournament Overberg Schools - PS Trials Region 3 2024				Tournament Overberg Schools - PS Closed 2024
		date 2024-03-02	rnd 5	type Rapid	result 1	date 2024-03-16	rnd 3	type Standard	result 1
		Opponent Coetzee, M (Milan)				Opponent Du Preez, J (Janco)
3	3	Tournament Overberg Schools - PS Closed 2025				Tournament Overberg Schools - PS Closed 2025
		date 2025-03-08	rnd 2	type Standard	result 1	date 2025-03-08	rnd 4	type Standard	result 1
		Opponent Grieb, N (Nathan)				Opponent Le Roux, M (Markus)

#	Games	Start				End
1	7	Tournament Overberg Top Schools 2023				Tournament Overberg Schools - PS Closed 2024
		date 2023-08-05	rnd 4	type Standard	result 0.5	date 2024-03-16	rnd 3	type Standard	result 1
		Opponent Le Roux, C (Carmen)				Opponent Du Preez, J (Janco)
2	3	Tournament Overberg Schools - PS Closed 2025				Tournament Overberg Schools - PS Closed 2025
		date 2025-03-08	rnd 2	type Standard	result 1	date 2025-03-08	rnd 4	type Standard	result 1
		Opponent Grieb, N (Nathan)				Opponent Le Roux, M (Markus)
3	2	Tournament Overberg Top Schools 2025				Tournament Western Cape Schools - Top Schools 2025
		date 2025-08-02	rnd 5	type Standard	result 1	date 2025-09-06	rnd 1	type Standard	result 1
		Opponent Moolman, J (Jacques)				Opponent Cloete, B (Beau-Login)

#	Games	Start				End
1	3	Tournament Overberg Schools - PS Trials (Region 1) 2025				Tournament Overberg Schools - PS Trials (Region 1) 2025
		date 2025-02-22	rnd 2	type Rapid	result 1	date 2025-02-22	rnd 4	type Rapid	result 1
		Opponent Chitungo, T (Tinotenda)				Opponent Kuhn, D (Dian)
2	2	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 3	type Rapid	result 1
		Opponent Stone, T (Tylor)				Opponent Pretorius, P (Pippa)
3	2	Tournament Overberg Schools - PS Trials Region 3 2024				Tournament Overberg Schools - PS Trials Region 3 2024
		date 2024-03-02	rnd 2	type Rapid	result 1	date 2024-03-02	rnd 3	type Rapid	result 1
		Opponent Myburgh, J (Joshua)				Opponent Otto, X (Xavier)

No games found.

#	Games	Start				End

#	Games	Start				End
1	4	Tournament Overberg Schools - PS Trials Region 3 2024				Tournament Overberg Schools - PS Closed 2024
		date 2024-03-02	rnd 5	type Rapid	result 1	date 2024-03-16	rnd 3	type Standard	result 1
		Opponent Coetzee, M (Milan)				Opponent Du Preez, J (Janco)
2	3	Tournament Overberg Schools - PS Closed 2025				Tournament Overberg Schools - PS Closed 2025
		date 2025-03-08	rnd 2	type Standard	result 1	date 2025-03-08	rnd 4	type Standard	result 1
		Opponent Grieb, N (Nathan)				Opponent Le Roux, M (Markus)
3	3	Tournament Overberg Schools - PS Trials (Region 1) 2025				Tournament Overberg Schools - PS Trials (Region 1) 2025
		date 2025-02-22	rnd 2	type Rapid	result 1	date 2025-02-22	rnd 4	type Rapid	result 1
		Opponent Chitungo, T (Tinotenda)				Opponent Kuhn, D (Dian)

#	Games	Start				End
1	6	Tournament Overberg Top Schools 2023				Tournament Overberg Schools - PS Closed 2024
		date 2023-08-05	rnd 5	type Standard	result 1	date 2024-03-16	rnd 3	type Standard	result 1
		Opponent Monroe, C (Chloe)				Opponent Du Preez, J (Janco)
2	3	Tournament Overberg Schools - PS Closed 2025				Tournament Overberg Schools - PS Closed 2025
		date 2025-03-08	rnd 2	type Standard	result 1	date 2025-03-08	rnd 4	type Standard	result 1
		Opponent Grieb, N (Nathan)				Opponent Le Roux, M (Markus)
3	2	Tournament Overberg Top Schools 2025				Tournament Western Cape Schools - Top Schools 2025
		date 2025-08-02	rnd 5	type Standard	result 1	date 2025-09-06	rnd 1	type Standard	result 1
		Opponent Moolman, J (Jacques)				Opponent Cloete, B (Beau-Login)

#	Games	Start				End
1	3	Tournament Overberg Schools - PS Trials (Region 1) 2025				Tournament Overberg Schools - PS Trials (Region 1) 2025
		date 2025-02-22	rnd 2	type Rapid	result 1	date 2025-02-22	rnd 4	type Rapid	result 1
		Opponent Chitungo, T (Tinotenda)				Opponent Kuhn, D (Dian)
2	2	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 3	type Rapid	result 1
		Opponent Stone, T (Tylor)				Opponent Pretorius, P (Pippa)
3	2	Tournament Overberg Schools - PS Trials Region 3 2024				Tournament Overberg Schools - PS Trials Region 3 2024
		date 2024-03-02	rnd 2	type Rapid	result 1	date 2024-03-02	rnd 3	type Rapid	result 1
		Opponent Myburgh, J (Joshua)				Opponent Otto, X (Xavier)

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	Du Preez ,J (Janco)	5	2	-85	1	1	425	4	1	-212.5	0	0	0
1	Du Preez ,J (Janco)	5	1246	1161	1	1220.9	1671	4	1238	1033.5	0	0	0
2	Faasen ,C (Charles)	5	2	-85	1	0.5	0	4	1.5	-106.2	0	0	0
2	Faasen ,C (Charles)	5	1248.2	1163.2	1	1195.6	1248.2	4	1247.3	1142	0	0	0
3	Kuhn ,D (Dian)	5	2	-85	1	0	-425	4	2	0	0	0	0
3	Kuhn ,D (Dian)	5	1241.9	1156.9	1	1186.7	816.9	4	1218.5	1241.9	0	0	0
4	Grieb ,N (Nathan)	4	3	212.5	2	2	425	2	1	0	0	0	0
4	Grieb ,N (Nathan)	4	1221.9	1434.4	2	1224.3	1646.9	2	1207.4	1221.9	0	0	0
5	Wood ,J (James)	3	0	-425	2	0	-425	1	0	-425	0	0	0
5	Wood ,J (James)	3	1285.9	860.9	2	1222.2	860.9	1	1284.5	860.9	0	0	0
6	Lourens ,L (Lihan)	2	0	-425	2	0	-425	0	0	0	0	0	0
6	Lourens ,L (Lihan)	2	1331.9	906.9	2	1282.1	906.9	0	0	0	0	0	0
7	Du Plessis ,E (Eben)	2	0	-425	2	0	-425	0	0	0	0	0	0
7	Du Plessis ,E (Eben)	2	1154.1	729.1	2	1166	729.1	0	0	0	0	0	0
8	Bruiners ,J (Jeanne)	2	0	-425	2	0	-425	0	0	0	0	0	0
8	Bruiners ,J (Jeanne)	2	1351.7	926.7	2	1371	926.7	0	0	0	0	0	0
9	Le Roux ,M (Markus)	2	1	0	1	1	425	1	0	-425	0	0	0
9	Le Roux ,M (Markus)	2	1208.6	1208.6	1	1157.3	1633.6	1	1260.1	783.6	0	0	0
10	Pretorius ,P (Pippa)	2	1	0	1	0	-425	1	1	425	0	0	0
10	Pretorius ,P (Pippa)	2	1210.9	1210.9	1	1217.1	785.9	1	1219.4	1635.9	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

Ratings

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PLAYER PAGE

Personal

Grobbelaar, M (Marlo)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms