Chess South Africa Ratings Database

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Personal

Van Der Merwe, W (Willem)

Chess SA id

1120130080

FIDE id

Date of birth

2012-05-02 (U14)

Gender

Male

Region

Sedibeng (GSV)

Citizen

RSA

Titles

Chess SA registered

Yes

Last active game

2025-10-18

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

1218.7

Item	Main	Standard	Rapid	Blitz
Rating	1326.1	1323.2	1221.1	1200
Raw rating	1326.1	1323.2	1221.1	1200
Weighted rating	1320.5	1313.7	1203.5	1200
Weighted performance	1273.3	1274.2	0	0
Floor	905.2	902.3	721.1	700
K-factor	32	32	36	36
Min/Max rating change allowed	138.5	139.1	160.9	165.8
Highest rating	1419.8 2024-04-01	1416.9 2024-04-01	1225.6 2023-10-01	1200 2018-10-01
Highest raw rating	1405.2 2024-05-01	1402.3 2024-05-01	1221.1 2025-11-01	1200 2024-02-01
Highest weighted rating	1405.2 2024-10-01	1402.3 2024-08-01	1203.5 2025-11-01	1200 2018-10-01
Highest weighted performance	1419.8 2024-04-01	1416.9 2024-04-01	1225.6 2023-10-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1326.1	1323.2	1221.1	1200
Analysis
Rating	1326.1	1323.2	1221.1	1200
Raw rating	1326.1	1323.2	1221.1	1200
Weighted rating	1320.5	1313.7	1203.5
Weighted performance	1273.3	1274.2	0
K-factor	32	32	36	36
Floor	905.2	902.3	721.1	700
Max/Min rating change allowed	138.5	139.1	160.9	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	1326.1	1323.2	1221.1	1200
New weighted rating	1321	1314.4	1205	1200
New weighted performance	1265.7	1266.5	0	0
Temp new rating	1326.1	1323.2	1221.1	1200
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1326.1	1323.2	1221.1	1200
New K-factor	32	32	36	36
New floor	905.2	902.3	721.1	700

Item	Main	Standard	Rapid
	0	0	0
	36	30	6
	59	59	0
	64	59	5
	51	51	0
	0	0	0
History	220	209	11

Games since
	Main 95	Standard 89		Rapid 6		Blitz 0
Gender	Male
Age group	U14
Region	Sedibeng (GSV)
Province	Gauteng (GT)
Main
	RSA		Province		Region
Overall	3003		1019		111
Male	2366		791		88
U14	545		175		27
U14 Male	394		120		19
Standard
	RSA		Province		Region
Overall	2950		1068		116
Male	2345		847		93
U14	534		182		29
U14 Male	384		127		20
Rapid
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U14	-1		-1		-1
U14 Male	-1		-1		-1
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U14	-1		-1		-1
U14 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	36	19	52.78	23.6	1303.8	1327.4
Standard	30	16	53.33	28.3	1299	1327.4
Rapid	6	3	50	0	1327.8	1327.8
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	220	120	54.55	38.6	1244.6	1283.2
Standard	209	114.5	54.78	40.7	1241.8	1282.4
Rapid	11	5.5	50	0	1298	1298
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-11-01	1326.1	1323.2	1221.1	1200
2025-09-30	1325.9	1323.2	1202	1200
2025-09-01	1325.9	1323.2	1202	1200
2025-08-01	1322.9	1319.5	1202	1200
2025-07-01	1321	1317.2	1202	1200
2025-06-01	1321	1317.2	1202	1200
2025-05-01	1318	1312.2	1202	1200
2025-04-01	1318	1312.2	1202	1200
2025-03-01	1316.5	1309	1202	1200
2025-02-01	1312	1303.6	1202	1200
2025-01-01	1248.8	1229.1	1202	1200
2024-12-01	1281	1262.1	1202	1200
2024-11-01	1281	1262.1	1202	1200
2024-10-01	1333.8	1317.1	1202	1200
2024-09-01	1333.8	1317.1	1202	1200
2024-08-01	1363	1351.7	1202	1200
2024-07-01	1405.2	1402.3	1202	1200
2024-09-01	1405.2	1402.3	1202	1200
2024-05-01	1405.2	1402.3	1202	1200
2024-04-01	1321	1334.6	1202	1200
2024-03-01	1235.2	1234.5	1202	1200
2024-02-01	1235.2	1234.5	1202	1200
2024-01-01	1312.4	1317.3	1202	1200
2023-12-01	1312.4	1317.3	1202	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	2025 Sedibeng Municipality OR Tambo Soncini Chess Finals (Boys)	2025-10-18	2025-10-18	Rapid	Sedibeng (GSV)	6	6	3	Yes	Analysis
2	GDE (D7) Sedibeng East Schools 2025 (U13)	2025-08-02	2025-08-02	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
3	Eureka Chess Open 26 July 2025 (F)	2025-07-26	2025-07-26	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
4	GDE Sedibeng East Schools - D7 Individuals 24 May 2025 (U13 Boys)	2025-05-24	2025-05-24	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
5	Hoerskool Drie Riviere Open 08 March 2025 (D)	2025-03-08	2025-03-08	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
6	Laer Volkskool Open 15 Feb 2025 (D)	2025-02-15	2025-02-15	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
7	Afrikaans High School Open 08 Feb 2025 (D)	2025-02-08	2025-02-08	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	2025 Sedibeng Municipality OR Tambo Soncini Chess Finals (Boys)	2025-10-18	2025-10-18	Rapid	Sedibeng (GSV)	6	6	3	Yes	Analysis
2	GDE (D7) Sedibeng East Schools 2025 (U13)	2025-08-02	2025-08-02	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
3	Eureka Chess Open 26 July 2025 (F)	2025-07-26	2025-07-26	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
4	GDE Sedibeng East Schools - D7 Individuals 24 May 2025 (U13 Boys)	2025-05-24	2025-05-24	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
5	Hoerskool Drie Riviere Open 08 March 2025 (D)	2025-03-08	2025-03-08	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
6	Laer Volkskool Open 15 Feb 2025 (D)	2025-02-15	2025-02-15	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
7	Afrikaans High School Open 08 Feb 2025 (D)	2025-02-08	2025-02-08	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
8	Gauteng Inter-Region at UJ 2024 (U14 Candidates)	2024-12-07	2024-12-08	Standard	Johannesburg Metro (GJM)	5	4	1	Yes	Analysis
9	Fonteine Open 2024 (D)	2024-10-19	2024-10-19	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
10	NWU Vaal Chess Open 12 Oct 2024 (D)	2024-10-12	2024-10-12	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
11	Gauteng Top Schools 2024 (U13 Open)	2024-10-04	2024-10-04	Standard	Ekurhuleni (GE)	5	5	2	Yes	Analysis
12	Sedibeng East D7 Teams Trials 2024 (U13)	2024-08-03	2024-08-03	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
13	Eureka Open 27 July 2024 (F)	2024-07-27	2024-07-27	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
14	Hoerskool Overvaal Chess Open 2024 (D)	2024-04-20	2024-04-20	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
15	Vaalpark Primary Chess Open 2024 (D)	2024-04-13	2024-04-13	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
16	Valia's Open 2024 (E)	2024-03-02	2024-03-02	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
17	NG Kerk Vanderbijlpark Suid 2024 (D)	2024-02-24	2024-02-24	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
18	Laerskool Midvaal Chess Open Section 2024 (D)	2024-02-10	2024-02-10	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
19	2024 Gauteng Inter-Region Chess Championship (U12A)	2024-01-13	2024-01-14	Standard	Tshwane (GTP)	5	5	0	Yes	Analysis
20	NWU Vaal Open 2023 (D)	2023-10-14	2023-10-14	Standard	Sedibeng (GSV)	5	5	2.5	Yes	Analysis
21	Dr Pieter Hangelbroek Rapid 2023 (C)	2023-10-28	2023-10-28	Rapid	Sedibeng (GSV)	5	5	2.5	Yes	Analysis
22	Fonteine Chess Open 2023 (E)	2023-09-02	2023-09-02	Standard	Sedibeng (GSV)	5	4	1.5	Yes	Analysis
23	2023 Gauteng Top Schools (U11 Mixed)	2023-08-18	2023-08-18	Standard	West Rand (GWR)	5	5	2	Yes	Analysis
24	Gauteng D7 Teams 2023 (U11)	2023-08-12	2023-08-12	Standard	Sedibeng (GSV)	5	5	5	Yes	Analysis
25	Overvaal Ope Jul 2023 (D)	2023-07-22	2023-07-22	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
26	Eureka Open 2023 (F)	2023-07-29	2023-07-29	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
27	Valia's Chess Tournament 2023 (D)	2023-05-06	2023-05-06	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
28	Gauteng Schools D7 2023 (U11 Boys)	2023-05-20	2023-05-20	Standard	Sedibeng (GSV)	5	5	3.5	Yes	Analysis
29	Overvaal Open 2023 (D)	2023-04-15	2023-04-15	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
30	Hoerskool Drie Riviere Open 2023 (D)	2023-03-11	2023-03-11	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
31	AG Visser Open 2023 (C)	2023-02-18	2023-02-18	Standard	Sedibeng (GSV)	5	5	1.5	Yes	Analysis
32	Laerkool Midvaal Chess Open 2023 (D)	2023-01-28	2023-01-28	Standard	Sedibeng (GSV)	5	5	2.5	Yes	Analysis
33	Dr Peter Hangelbroek Open 2022 (E)	2022-10-29	2022-10-29	Standard	Sedibeng (GSV)	5	2	0.5	Yes	Analysis
34	Overvaal Open 2022 (D)	2022-08-06	2022-08-06	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
35	D7 Teams 2022 (U9+U11 Mixed)	2022-08-13	2022-08-13	Standard	Sedibeng (GSV)	5	5	5	Yes	Analysis
36	2022 Gauteng Schools Team Championships (U11 Open)	2022-08-27	2022-08-27	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
37	Eureka Open 2022 (G+H)	2022-07-30	2022-07-30	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
38	Hoerskool Overvaal 2022 (D)	2022-06-11	2022-06-11	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
39	Gaueng Schools D7 2022 (U11 Boys)	2022-06-04	2022-06-04	Standard	Sedibeng (GSV)	5	5	4	Yes	Analysis
40	2022 Gauteng Schools Individual Chess Championship (U11 Boys)	2022-06-18	2022-06-18	Standard	Ekurhuleni (GE)	5	5	2.5	Yes	Analysis
41	LS Vryheidsmonument Chess Open 2022 (D)	2022-05-07	2022-05-07	Standard	Sedibeng (GSV)	5	4	2	Yes	Analysis
42	Lux Deo NG Kerk Chess Open 2022 (D)	2022-04-09	2022-04-09	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
43	Midvaal Ope 2022 (D)	2022-01-29	2022-01-29	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis
44	Hoerskool Drie Riviere 2020 (F)	2020-03-07	2020-03-07	Standard	Sedibeng (GSV)	5	5	2	Yes	Analysis
45	Midvaal Chess Open 2020 (D)	2020-01-25	2020-01-25	Standard	Sedibeng (GSV)	5	5	3	Yes	Analysis

#	Games	Start				End
1	7	Tournament D7 Teams 2022				Tournament 2022 Gauteng Schools Team Championships
		date 2022-08-13	rnd 1	type Standard	result 1	date 2022-08-27	rnd 2	type Standard	result 1
		Opponent Dlamini, L (Lucky)				Opponent Saeed, Z (Zanairah)
2	6	Tournament Eureka Open 2023				Tournament Gauteng D7 Teams 2023
		date 2023-07-29	rnd 5	type Standard	result 1	date 2023-08-12	rnd 5	type Standard	result 1
		Opponent Tolmay, W (Walroux)				Opponent Pereira, R (Raychel)
3	5	Tournament Eureka Open 2022				Tournament Overvaal Open 2022
		date 2022-07-30	rnd 4	type Standard	result 1	date 2022-08-06	rnd 3	type Standard	result 1
		Opponent Viljoen, C (Chene)				Opponent Viljoen, C (Chene)

#	Games	Start				End
1	7	Tournament D7 Teams 2022				Tournament 2022 Gauteng Schools Team Championships
		date 2022-08-13	rnd 1	type Standard	result 1	date 2022-08-27	rnd 2	type Standard	result 1
		Opponent Dlamini, L (Lucky)				Opponent Saeed, Z (Zanairah)
2	6	Tournament Eureka Open 2023				Tournament Gauteng D7 Teams 2023
		date 2023-07-29	rnd 5	type Standard	result 1	date 2023-08-12	rnd 5	type Standard	result 1
		Opponent Tolmay, W (Walroux)				Opponent Pereira, R (Raychel)
3	5	Tournament Eureka Open 2022				Tournament Overvaal Open 2022
		date 2022-07-30	rnd 4	type Standard	result 1	date 2022-08-06	rnd 3	type Standard	result 1
		Opponent Viljoen, C (Chene)				Opponent Viljoen, C (Chene)

#	Games	Start				End
1	2	Tournament Dr Pieter Hangelbroek Rapid 2023				Tournament Dr Pieter Hangelbroek Rapid 2023
		date 2023-10-28	rnd 1	type Rapid	result 0.5	date 2023-10-28	rnd 2	type Rapid	result 1
		Opponent De Jager, K (Kobus)				Opponent Booysen, Z (Zian)
2	1	Tournament Dr Pieter Hangelbroek Rapid 2023				Tournament Dr Pieter Hangelbroek Rapid 2023
		date 2023-10-28	rnd 4	type Rapid	result 1	date 2023-10-28	rnd 4	type Rapid	result 1
		Opponent Gielink, B (Benjamin)				Opponent Gielink, B (Benjamin)

No games found.

#	Games	Start				End

#	Games	Start				End
1	7	Tournament D7 Teams 2022				Tournament 2022 Gauteng Schools Team Championships
		date 2022-08-13	rnd 1	type Standard	result 1	date 2022-08-27	rnd 2	type Standard	result 1
		Opponent Dlamini, L (Lucky)				Opponent Saeed, Z (Zanairah)
2	6	Tournament Eureka Open 2023				Tournament Gauteng D7 Teams 2023
		date 2023-07-29	rnd 5	type Standard	result 1	date 2023-08-12	rnd 5	type Standard	result 1
		Opponent Tolmay, W (Walroux)				Opponent Pereira, R (Raychel)
3	5	Tournament Eureka Open 2022				Tournament Overvaal Open 2022
		date 2022-07-30	rnd 4	type Standard	result 1	date 2022-08-06	rnd 3	type Standard	result 1
		Opponent Viljoen, C (Chene)				Opponent Viljoen, C (Chene)

#	Games	Start				End
1	7	Tournament D7 Teams 2022				Tournament 2022 Gauteng Schools Team Championships
		date 2022-08-13	rnd 1	type Standard	result 1	date 2022-08-27	rnd 2	type Standard	result 1
		Opponent Dlamini, L (Lucky)				Opponent Saeed, Z (Zanairah)
2	6	Tournament Eureka Open 2023				Tournament Gauteng D7 Teams 2023
		date 2023-07-29	rnd 5	type Standard	result 1	date 2023-08-12	rnd 5	type Standard	result 1
		Opponent Tolmay, W (Walroux)				Opponent Pereira, R (Raychel)
3	5	Tournament Eureka Open 2022				Tournament Overvaal Open 2022
		date 2022-07-30	rnd 4	type Standard	result 1	date 2022-08-06	rnd 3	type Standard	result 1
		Opponent Viljoen, C (Chene)				Opponent Viljoen, C (Chene)

#	Games	Start				End
1	1	Tournament Dr Pieter Hangelbroek Rapid 2023				Tournament Dr Pieter Hangelbroek Rapid 2023
		date 2023-10-28	rnd 4	type Rapid	result 1	date 2023-10-28	rnd 4	type Rapid	result 1
		Opponent Gielink, B (Benjamin)				Opponent Gielink, B (Benjamin)
2	1	Tournament Dr Pieter Hangelbroek Rapid 2023				Tournament Dr Pieter Hangelbroek Rapid 2023
		date 2023-10-28	rnd 2	type Rapid	result 1	date 2023-10-28	rnd 2	type Rapid	result 1
		Opponent Booysen, Z (Zian)				Opponent Booysen, Z (Zian)

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	Tolmay ,W (Walroux)	5	1.5	-170	5	1.5	-170	0	0	0	0	0	0
1	Tolmay ,W (Walroux)	5	1334.8	1164.8	5	1330.3	1164.8	0	0	0	0	0	0
2	Viljoen ,C (Chene)	5	4.5	340	5	4.5	340	0	0	0	0	0	0
2	Viljoen ,C (Chene)	5	1160.7	1500.7	5	1152.9	1500.7	0	0	0	0	0	0
3	Myburgh ,V (Vaughn)	5	1	-255	5	1	-255	0	0	0	0	0	0
3	Myburgh ,V (Vaughn)	5	1302.9	1047.9	5	1302.6	1047.9	0	0	0	0	0	0
4	Nagel ,D (Divan)	5	1	-255	5	1	-255	0	0	0	0	0	0
4	Nagel ,D (Divan)	5	1338.1	1083.1	5	1335.4	1083.1	0	0	0	0	0	0
5	Bezuidenhoudt ,M (Marlo)	5	2.5	0	4	2.5	106.2	1	0	-425	0	0	0
5	Bezuidenhoudt ,M (Marlo)	5	1305.5	1305.5	4	1295.1	1411.7	1	1200	880.5	0	0	0
6	Brand ,H (Henko)	5	1.5	-170	4	1.5	-106.2	1	0	-425	0	0	0
6	Brand ,H (Henko)	5	1475.4	1305.4	4	1438.9	1369.1	1	1438.4	1050.4	0	0	0
7	Smith ,MI (Melea Ine)	4	3.5	318.8	4	3.5	318.8	0	0	0	0	0	0
7	Smith ,MI (Melea Ine)	4	1147.9	1466.7	4	1131.8	1466.7	0	0	0	0	0	0
8	Wagner ,E (Elona)	4	2	0	4	2	0	0	0	0	0	0	0
8	Wagner ,E (Elona)	4	1355.9	1355.9	4	1361.2	1355.9	0	0	0	0	0	0
9	Sampson ,C (Cadon)	4	1	-212.5	4	1	-212.5	0	0	0	0	0	0
9	Sampson ,C (Cadon)	4	1228.8	1016.3	4	1227.2	1016.3	0	0	0	0	0	0
10	Viviers ,W (Wiaan)	4	1	-212.5	4	1	-212.5	0	0	0	0	0	0
10	Viviers ,W (Wiaan)	4	1212	999.5	4	1209.3	999.5	0	0	0	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

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Van Der Merwe, W (Willem)

Ratings

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Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms