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

2025-10-18

Personal details last changed

1900-01-01

Junior GPX Games

35.2

Junior GPX Points

1106.9

Item	Main	Standard	Rapid	Blitz
Rating	1200.9	1197.2	1209.6	1200
Raw rating	1200.9	1197.2	1189.7	1200
Weighted rating	1195.1	1185.2	1209.6	1200
Weighted performance	1135.7	1135.6	1136.4	0
Floor	739.6	748.2	716.9	700
K-factor	36	36	36	36
Min/Max rating change allowed	165.6	166.5	168.3	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	-1.6	0
New rating	1200.9	1197.2	1208	1200
Analysis
Rating	1200.9	1197.2	1209.6	1200
Raw rating	1200.9	1197.2	1189.7	1200
Weighted rating	1195.1	1185.2	1209.6
Weighted performance	1135.7	1135.6	1136.4
K-factor	36	36	36	36
Floor	739.6	748.2	716.9	700
Max/Min rating change allowed	165.6	166.5	168.3	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	1200.9	1197.2	1189.7	1200
New weighted rating	1195.4	1185.5	1208	1200
New weighted performance	1128.9	1128.7	1129.5	0
Temp new rating	1200.9	1197.2	1208	1200
Temp new rating +/-	0	0	-1.6	0
Final new rating +/-	0	0	-1.6	0
New rating	1200.9	1197.2	1208	1200
New K-factor	36	36	36	36
New floor	739.6	748.2	716.9	700

Item	Main	Standard	Rapid
	0	0	0
	50	22	28
	35	20	15
	12	7	5
	0	0	0
	0	0	0
History	97	49	48

Games since
	Main 85	Standard 42		Rapid 43		Blitz 0
Gender	Male
Age group	U10
Region	Overberg (WOS)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	4132		1382		123
Male	3084		975		77
U10	390		132		21
U10 Male	292		95		16
Standard
	RSA		Province		Region
Overall	4101		1165		72
Male	3064		800		47
U10	386		111		15
U10 Male	294		78		11
Rapid
	RSA		Province		Region
Overall	1600		787		115
Male	1232		592		73
U10	157		82		23
U10 Male	118		64		19
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	50	22	44	-51	1264.8	1213.8
Standard	22	10	45.45	-38.6	1270.3	1231.6
Rapid	28	12	42.86	-60.7	1260.5	1199.7
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	97	42	43.3	-57	1248.1	1191.2
Standard	49	20.5	41.84	-69.4	1247.1	1177.7
Rapid	48	21.5	44.79	-44.3	1249.2	1204.9
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-11-01	1200.9	1197.2	1189.7	1200
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
2024-09-01	1210.3	1211.1	1216.9	1200
2024-05-01	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

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	Curro Hermanus Spring Open 2025 (U9)	2025-10-18	2025-10-18	Rapid	Overberg (WOS)	6	6	2	Yes	Analysis
2	Kingsway Chess Open 2025 (U10)	2025-09-20	2025-09-20	Rapid	Overberg (WOS)	6	5	2	Yes	Analysis
3	Western Cape Schools - Top Schools 2025 (U9)	2025-09-06	2025-09-07	Standard	Overberg (WOS)	6	6	2	Yes	Analysis
4	Overberg Top Schools 2025 (U7+U9)	2025-08-02	2025-08-02	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
5	Western Cape Schools Individual Championship 2025 (U9 Boys)	2025-05-17	2025-05-18	Standard	Cape Winelands (WCW)	6	6	2	Yes	Analysis
6	Overberg Schools - PS Closed 2025 (U9 Boys)	2025-03-08	2025-03-08	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
7	Overberg Schools - PS Trials (Region 1) 2025 (U9 Boys)	2025-02-22	2025-02-22	Rapid	Overberg (WOS)	6	6	3	Yes	Analysis
8	Curro Hermanus Summer Open 2025 (U9)	2025-02-08	2025-02-08	Rapid	Overberg (WOS)	6	6	3	Yes	Analysis
9	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	Curro Hermanus Spring Open 2025 (U9)	2025-10-18	2025-10-18	Rapid	Overberg (WOS)	6	6	2	Yes	Analysis
2	Kingsway Chess Open 2025 (U10)	2025-09-20	2025-09-20	Rapid	Overberg (WOS)	6	5	2	Yes	Analysis
3	Western Cape Schools - Top Schools 2025 (U9)	2025-09-06	2025-09-07	Standard	Overberg (WOS)	6	6	2	Yes	Analysis
4	Overberg Top Schools 2025 (U7+U9)	2025-08-02	2025-08-02	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
5	Western Cape Schools Individual Championship 2025 (U9 Boys)	2025-05-17	2025-05-18	Standard	Cape Winelands (WCW)	6	6	2	Yes	Analysis
6	Overberg Schools - PS Closed 2025 (U9 Boys)	2025-03-08	2025-03-08	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
7	Overberg Schools - PS Trials (Region 1) 2025 (U9 Boys)	2025-02-22	2025-02-22	Rapid	Overberg (WOS)	6	6	3	Yes	Analysis
8	Curro Hermanus Summer Open 2025 (U9)	2025-02-08	2025-02-08	Rapid	Overberg (WOS)	6	6	3	Yes	Analysis
9	Overberg Schools & Federation Open 2025 (U9)	2025-02-01	2025-02-01	Rapid	Overberg (WOS)	6	5	2	Yes	Analysis
10	Kingsway Chess Open 2024 (U8)	2024-09-14	2024-09-14	Rapid	Overberg (WOS)	6	5	2	Yes	Analysis
11	Western Cape Top Schools Championship 2024 (U9 Mixed)	2024-08-30	2024-09-01	Standard	Eden (WEG)	6	5	0	Yes	Analysis
12	Overberg Schools - Top Schools 2024 (U7+U9 Mixed)	2024-07-27	2024-07-27	Standard	Overberg (WOS)	5	5	2	Yes	Analysis
13	Western Cape PS Individuals Championship 2024 (U9 Boys)	2024-05-04	2024-05-05	Standard	West Coast (WCU)	6	5	1	Yes	Analysis
14	Overberg Schools - PS Closed 2024 (U9 Boys)	2024-03-16	2024-03-16	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
15	Overberg Schools - PS Trials Region 3 2024 (U9 Boys)	2024-03-02	2024-03-02	Rapid	Overberg (WOS)	5	5	3	Yes	Analysis
16	Overberg Open Rapid 2024 (U7+U9)	2024-01-27	2024-01-27	Rapid	Overberg (WOS)	5	5	2	Yes	Analysis
17	Kingsway Open 2023 (U8)	2023-10-28	2023-10-28	Rapid	Overberg (WOS)	5	5	2.5	Yes	Analysis
18	Western Cape Top Schools 2023 (U7 Mixed)	2023-09-02	2023-09-03	Standard	Cape Winelands (WCW)	5	2	2	Yes	Analysis
19	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	Kuhn ,D (Dian)	6	2	-141.7	1	0	-425	5	2	-85	0	0	0
1	Kuhn ,D (Dian)	6	1254.8	1113.1	1	1186.7	829.8	5	1219.7	1169.8	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	Du Preez ,J (Janco)	5	2	-85	1	1	425	4	1	-212.5	0	0	0
3	Du Preez ,J (Janco)	5	1246	1161	1	1220.9	1671	4	1238	1033.5	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	Bruiners ,J (Jeanne)	2	0	-425	2	0	-425	0	0	0	0	0	0
6	Bruiners ,J (Jeanne)	2	1351.7	926.7	2	1371	926.7	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	Lourens ,L (Lihan)	2	0	-425	2	0	-425	0	0	0	0	0	0
8	Lourens ,L (Lihan)	2	1331.9	906.9	2	1282.1	906.9	0	0	0	0	0	0
9	Harikisun ,A (Aaheli)	2	2	425	1	1	425	1	1	425	0	0	0
9	Harikisun ,A (Aaheli)	2	1172	1597	1	1182.8	1597	1	1181.9	1597	0	0	0
10	Le Roux ,M (Markus)	2	1	0	1	1	425	1	0	-425	0	0	0
10	Le Roux ,M (Markus)	2	1208.6	1208.6	1	1157.3	1633.6	1	1260.1	783.6	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

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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