Chess South Africa Ratings Database

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Personal

Zwartz, Z (Zeke)

Chess SA id

1160150372

FIDE id

534018360

Date of birth

2016-01-13 (U12)

Gender

Male

Region

Cape Town (WCT)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-12-20

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1629.1	1612.8	1453.9	1200
Raw rating	1623.5	1605.5	1453.9	1200
Weighted rating	1450.3	1415	1380.1	1200
Weighted performance	1629.1	1612.8	1430.5	0
Floor	1123.5	1105.5	953.9	700
K-factor	28	28	32	36
Min/Max rating change allowed	90.7	93	115.5	165.8
Highest rating	1629.1 2026-01-01	1612.8 2026-01-01	1624.4 2023-02-01	1200 2018-10-01
Highest raw rating	1623.5 2026-01-01	1605.5 2026-01-01	1453.9 2026-01-01	1200 2024-03-01
Highest weighted rating	1450.3 2026-01-01	1415 2026-01-01	1380.1 2026-01-01	1200 2018-10-01
Highest weighted performance	1629.1 2026-01-01	1612.8 2026-01-01	1624.4 2023-02-01	1200 2024-03-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	-17.2	-23.8	0	0
New rating	1611.9	1589	1453.9	1200
Analysis
Rating	1629.1	1612.8	1453.9	1200
Raw rating	1623.5	1605.5	1453.9	1200
Weighted rating	1450.3	1415	1380.1
Weighted performance	1629.1	1612.8	1430.5
K-factor	28	28	32	36
Floor	1123.5	1105.5	953.9	700
Max/Min rating change allowed	90.7	93	115.5	165.8
Games	5	5	0	0
Score	3	3	0	0
Expected score	3.41	3.59	0	0
Score-Expected	-0.41	-0.59	0	0
Temp raw +/-	-11.6	-16.5	0	0
Final raw +/-	-11.6	-16.5	0	0
New raw rating	1611.9	1589	1453.9	1200
New weighted rating	1467.1	1433.4	1388	1200
New weighted performance	1601.3	1585.9	1420.8	0
Temp new rating	1611.9	1589	1453.9	1200
Temp new rating +/-	-17.2	-23.8	0	0
Final new rating +/-	-17.2	-23.8	0	0
New rating	1611.9	1589	1453.9	1200
New K-factor	28	28	32	36
New floor	1123.5	1105.5	953.9	700

Item	Main	Standard	Rapid
	0	0	0
	77	52	25
	60	27	33
	46	6	40
	0	0	0
	0	0	0
History	183	85	98

Games since
	Main 143	Standard 79		Rapid 64		Blitz 0
Gender	Male
Age group	U10
Region	Cape Town (WCT)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	1027		321		183
Male	896		277		159
U10	46		11		6
U10 Male	39		10		5
Standard
	RSA		Province		Region
Overall	1017		281		163
Male	878		237		142
U10	48		10		5
U10 Male	40		8		4
Rapid
	RSA		Province		Region
Overall	589		298		136
Male	506		257		127
U10	32		18		9
U10 Male	28		15		7
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	77	50.5	65.58	132.5	1320.9	1453.4
Standard	52	34	65.38	130.8	1348.2	1478.9
Rapid	25	16.5	66	136	1264.2	1400.2
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	183	117.5	64.21	120.8	1272.5	1393.2
Standard	85	53	62.35	105	1319.7	1424.7
Rapid	98	64.5	65.82	134.4	1231.5	1365.9
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2026-01-01	1623.5	1605.5	1453.9	1200
2025-11-30	1531.4	1524.9	1386.3	1200
2025-11-01	1531.4	1524.9	1386.3	1200
2025-09-30	1531.4	1524.9	1386.3	1200
2025-09-01	1531.4	1524.9	1386.3	1200
2025-08-01	1517.2	1507.7	1386.3	1200
2025-07-01	1461.6	1450.6	1386.3	1200
2025-06-01	1423.7	1410.6	1386.3	1200
2025-05-01	1391.2	1362.1	1386.3	1200
2025-04-01	1402.1	1358.5	1386.3	1200
2025-03-01	1407	1308.8	1415.6	1200
2025-02-01	1371	1267.5	1389.8	1200
2025-01-01	1363.5	1267.5	1390.8	1200
2024-12-01	1363.5	1267.5	1390.8	1200
2024-11-01	1363.5	1267.5	1390.8	1200
2024-10-01	1348.1	1267.5	1353.2	1200
2024-09-01	1312	1267.5	1292.4	1200
2024-11-01	1312	1267.5	1292.4	1200
2024-07-01	1293.9	1267.5	1260	1200
2024-06-01	1308.2	1288	1260	1200
2024-05-01	1302.4	1278.3	1271.9	1200
2024-04-01	1335.8	1299.2	1294.9	1200
2024-03-01	1332.2	1293.1	1294.9	1200
2024-02-01	1286.5	1227.2	1294.9	1200

Comming soon.

Tournaments

History

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Helderberg Chess Club Open 2026 (U11 Mixed)	2026-01-17	2026-01-17	Standard	Cape Town (WCT)	5	5	3	Yes	Analysis

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Helderberg Chess Club Open 2026 (U11 Mixed)	2026-01-17	2026-01-17	Standard	Cape Town (WCT)	5	5	3	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 (U11 Mixed)	2026-01-17	2026-01-17	Standard	Cape Town (WCT)	5	5	3	Yes	Analysis
2	2025 Mzansi Individual Championships (U10 Open)	2025-12-17	2025-12-20	Standard	Nelson Mandela Bay (ENM)	6	6	5	Yes	Analysis
3	2025 Mzansi Inter Provincial Team Championships (U10 Combined)	2025-12-15	2025-12-17	Standard	Nelson Mandela Bay (ENM)	6	6	5	Yes	Analysis
4	Six Gun Grill Summer Sport Festival Chess Championships 2025 (Individual U11 Boys)	2025-12-09	2025-12-09	Rapid	Cape Winelands (WCW)	5	5	3.5	Yes	Analysis
5	Six Gun Grill Summer Sport Festival Chess Championships 2025 (Team U11)	2025-12-08	2025-12-08	Rapid	Cape Winelands (WCW)	5	4	4	Yes	Analysis
6	Cape Town Metro North Top Schools 2025 (U11)	2025-08-01	2025-08-02	Standard	Cape Town (WCT)	5	5	4.5	Yes	Analysis
7	Cape Winelands Open 2025 (U10)	2025-07-19	2025-07-19	Standard	Cape Winelands (WCW)	5	4	3	Yes	Analysis
8	Helderberg Chess Club Open 2025 (U9)	2025-06-07	2025-06-07	Standard	Cape Town (WCT)	5	5	3.5	Yes	Analysis
9	Cape Town Chess Junior League 2025 (U12)	2025-05-10	2025-05-31	Standard	Cape Town (WCT)	6	5	4	Yes	Analysis
10	Western Cape Schools Individual Championship 2025 (U9 Boys)	2025-05-17	2025-05-18	Standard	Cape Winelands (WCW)	6	6	4.5	Yes	Analysis
11	South African Junior Closed Chess Championships 2025 (U10 Open)	2025-03-31	2025-04-05	Standard	Cape Winelands (WCW)	9	9	3.5	Yes	Analysis
12	Cape Town Open Chess Festival 2025 (U10)	2025-03-22	2025-03-23	Standard	Cape Town (WCT)	6	6	3	Yes	Analysis
13	Steinitz Festival 2025 (U10)	2025-03-15	2025-03-15	Rapid	Cape Town (WCT)	7	7	4	Yes	Analysis
14	CT Metro Schools Individual Closed 2025 (U9 Open)	2025-03-01	2025-03-02	Standard	Cape Town (WCT)	6	6	4	Yes	Analysis
15	Cape of Good Hope Open 2025 (U10)	2025-02-22	2025-02-22	Rapid	Cape Town (WCT)	6	6	3	Yes	Analysis
16	Laerskool Welgemoed Rapid 2025 (U10)	2025-02-15	2025-02-15	Rapid	Cape Town (WCT)	6	6	5.5	Yes	Analysis
17	CT Metro North Schools Chess Individual Trials 2025 (U9 Open)	2025-02-08	2025-02-09	Standard	Cape Town (WCT)	6	6	4	Yes	Analysis
18	2025 Kraaifontein Open Chess Championships (Rapid U10)	2025-01-04	2025-01-04	Rapid	Cape Town (WCT)	6	6	4	Yes	Analysis
19	Laerskool Welgemoed Rapid 2024 (U10)	2024-10-19	2024-10-19	Rapid	Cape Town (WCT)	6	6	4	Yes	Analysis
20	UCT Open Chess Championship 2024 (U10)	2024-10-12	2024-10-13	Rapid	Cape Town (WCT)	6	6	4	Yes	Analysis
21	CBC Rapid Chess Tournament 2024 (U8)	2024-09-14	2024-09-14	Rapid	Cape Town (WCT)	6	6	5	Yes	Analysis
22	CT District North Top Schools 2024 (U9 Mixed)	2024-07-27	2024-07-27	Rapid	Cape Town (WCT)	5	4	3	Yes	Analysis
23	Cape Town Chess Federation Closed Chess Championships 2024 (U10)	2024-06-15	2024-06-15	Standard	Cape Town (WCT)	5	5	2	Yes	Analysis
24	Cape Town Junior League Finals 2024 (U13 Open A)	2024-05-18	2024-05-18	Rapid	Cape Town (WCT)	5	4	1	Yes	Analysis
25	Western Cape PS Individuals Championship 2024 (U9 Boys)	2024-05-04	2024-05-05	Standard	West Coast (WCU)	6	6	3.5	Yes	Analysis
26	Cape Town Junior League - Qualifier 2 2024 (U13)	2024-04-20	2024-04-20	Rapid	Cape Town (WCT)	6	6	4	Yes	Analysis
27	Cape Town Junior League Qualifier 2024 (U13 Open)	2024-04-06	2024-04-06	Rapid	Cape Town (WCT)	6	1	0	Yes	Analysis
28	Strategize to Win 2024 (E)	2024-04-13	2024-04-14	Standard	Cape Town (WCT)	5	5	2	Yes	Analysis
29	Cape Town Metro Schools Chess Closed Individuals 2024 (U9 Boys)	2024-03-02	2024-03-03	Standard	Cape Town (WCT)	6	6	3.5	Yes	Analysis
30	North District School Trials 2024 (U9 Boys)	2024-02-03	2024-02-03	Standard	Cape Town (WCT)	5	5	4	Yes	Analysis
31	Rylib Summer Slam 2023 (Development)	2023-12-12	2023-12-12	Rapid	Cape Town (WCT)	6	6	3	Yes	Analysis
32	Chas Everitt and MHI Attorneys Rapid 2023 (U8)	2023-11-04	2023-11-04	Rapid	Cape Town (WCT)	6	6	5	Yes	Analysis
33	Western Cape Closed Championship 2023 (U8)	2023-09-23	2023-09-23	Rapid	Cape Town (WCT)	6	6	4	Yes	Analysis
34	CT Metro District North Top Schools Chess 2023 (U9 Mixed)	2023-07-29	2023-07-29	Rapid	Cape Town (WCT)	3	2	1	Yes	Analysis
35	GPCA Rapid 2023 (U10)	2023-06-24	2023-06-24	Rapid	Cape Town (WCT)	7	7	3	Yes	Analysis
36	Western Cape PS Individuals 2023 (U7 Boys)	2023-05-05	2023-05-06	Standard	Cape Town (WCT)	6	6	4	Yes	Analysis
37	Cape Town Metro Schools Chess Closed Individuals 2023 (U7 Mixed)	2023-03-04	2023-03-04	Rapid	Cape Town (WCT)	5	4	2	Yes	Analysis
38	North District School Trials 2023 (U7 Boys)	2023-02-04	2023-02-04	Rapid	Cape Town (WCT)	6	4	4	Yes	Analysis
39	Laerskool Welgemoed Rapid 2023 (U8)	2023-02-11	2023-02-11	Rapid	Cape Town (WCT)	5	5	5	Yes	Analysis

#	Games	Start				End
1	10	Tournament North District School Trials 2023				Tournament Cape Town Metro Schools Chess Closed Individuals 2023
		date 2023-02-04	rnd 2	type Rapid	result 1	date 2023-03-04	rnd 2	type Rapid	result 1
		Opponent Esterhuizen, C (Christiaan)				Opponent Javed, M (Mariam)
2	8	Tournament Western Cape Schools Individual Championship 2025				Tournament Helderberg Chess Club Open 2025
		date 2025-05-17	rnd 4	type Standard	result 1	date 2025-06-07	rnd 2	type Standard	result 1
		Opponent Huisamen, H (Heinrich)				Opponent Beukes, C (Cullen)
3	8	Tournament Laerskool Welgemoed Rapid 2025				Tournament Cape of Good Hope Open 2025
		date 2025-02-15	rnd 1	type Rapid	result 1	date 2025-02-22	rnd 2	type Rapid	result 1
		Opponent Horn, N (Nielen)				Opponent Subrayen, C (Christopher)

#	Games	Start				End
1	8	Tournament Western Cape Schools Individual Championship 2025				Tournament Helderberg Chess Club Open 2025
		date 2025-05-17	rnd 4	type Standard	result 1	date 2025-06-07	rnd 2	type Standard	result 1
		Opponent Huisamen, H (Heinrich)				Opponent Beukes, C (Cullen)
2	7	Tournament Western Cape PS Individuals 2023				Tournament North District School Trials 2024
		date 2023-05-05	rnd 3	type Standard	result 1	date 2024-02-03	rnd 3	type Standard	result 1
		Opponent Morris, J (Jaydon)				Opponent Meyer, D (Declan)
3	6	Tournament Cape Winelands Open 2025				Tournament Cape Town Metro North Top Schools 2025
		date 2025-07-19	rnd 5	type Standard	result 1	date 2025-08-02	rnd 5	type Standard	result 1
		Opponent de Villiers, I (Isabelle)				Opponent Jansen, J (Jordan)

#	Games	Start				End
1	10	Tournament North District School Trials 2023				Tournament Cape Town Metro Schools Chess Closed Individuals 2023
		date 2023-02-04	rnd 2	type Rapid	result 1	date 2023-03-04	rnd 2	type Rapid	result 1
		Opponent Esterhuizen, C (Christiaan)				Opponent Javed, M (Mariam)
2	9	Tournament 2025 Kraaifontein Open Chess Championships				Tournament Cape of Good Hope Open 2025
		date 2025-01-04	rnd 6	type Rapid	result 1	date 2025-02-22	rnd 2	type Rapid	result 1
		Opponent Balogun, S (Samuel)				Opponent Subrayen, C (Christopher)
3	7	Tournament Western Cape Closed Championship 2023				Tournament Chas Everitt and MHI Attorneys Rapid 2023
		date 2023-09-23	rnd 5	type Rapid	result 1	date 2023-11-04	rnd 5	type Rapid	result 1
		Opponent Levin, J (Jessie)				Opponent Stein, J (Jack)

No games found.

#	Games	Start				End

#	Games	Start				End
1	10	Tournament North District School Trials 2023				Tournament Cape Town Metro Schools Chess Closed Individuals 2023
		date 2023-02-04	rnd 2	type Rapid	result 1	date 2023-03-04	rnd 2	type Rapid	result 1
		Opponent Esterhuizen, C (Christiaan)				Opponent Javed, M (Mariam)
2	7	Tournament Western Cape Closed Championship 2023				Tournament Chas Everitt and MHI Attorneys Rapid 2023
		date 2023-09-23	rnd 5	type Rapid	result 1	date 2023-11-04	rnd 5	type Rapid	result 1
		Opponent Levin, J (Jessie)				Opponent Stein, J (Jack)
3	6	Tournament Western Cape Schools Individual Championship 2025				Tournament Helderberg Chess Club Open 2025
		date 2025-05-18	rnd 6	type Standard	result 1	date 2025-06-07	rnd 2	type Standard	result 1
		Opponent Williams, T (Tyler)				Opponent Beukes, C (Cullen)

#	Games	Start				End
1	6	Tournament Western Cape Schools Individual Championship 2025				Tournament Helderberg Chess Club Open 2025
		date 2025-05-18	rnd 6	type Standard	result 1	date 2025-06-07	rnd 2	type Standard	result 1
		Opponent Williams, T (Tyler)				Opponent Beukes, C (Cullen)
2	4	Tournament Cape Winelands Open 2025				Tournament Cape Town Metro North Top Schools 2025
		date 2025-07-19	rnd 5	type Standard	result 1	date 2025-08-02	rnd 3	type Standard	result 1
		Opponent de Villiers, I (Isabelle)				Opponent Hansby, R (Rome)
3	4	Tournament CT Metro North Schools Chess Individual Trials 2025				Tournament CT Metro North Schools Chess Individual Trials 2025
		date 2025-02-08	rnd 1	type Standard	result 1	date 2025-02-09	rnd 4	type Standard	result 1
		Opponent Vazirgiantzikis, A (Andreas)				Opponent Akemdien, A (Alex)

#	Games	Start				End
1	10	Tournament North District School Trials 2023				Tournament Cape Town Metro Schools Chess Closed Individuals 2023
		date 2023-02-04	rnd 2	type Rapid	result 1	date 2023-03-04	rnd 2	type Rapid	result 1
		Opponent Esterhuizen, C (Christiaan)				Opponent Javed, M (Mariam)
2	7	Tournament Western Cape Closed Championship 2023				Tournament Chas Everitt and MHI Attorneys Rapid 2023
		date 2023-09-23	rnd 5	type Rapid	result 1	date 2023-11-04	rnd 5	type Rapid	result 1
		Opponent Levin, J (Jessie)				Opponent Stein, J (Jack)
3	6	Tournament CBC Rapid Chess Tournament 2024				Tournament UCT Open Chess Championship 2024
		date 2024-09-14	rnd 3	type Rapid	result 1	date 2024-10-12	rnd 2	type Rapid	result 1
		Opponent Akemdien, A (Alex)				Opponent Botha, J (Johann Alexander)

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	Akemdien ,A (Alex)	5	3	85	3	1	-141.7	2	2	425	0	0	0
1	Akemdien ,A (Alex)	5	1372.9	1457.9	3	1448.6	1231.2	2	1217.2	1797.9	0	0	0
2	Ramonyaluoe ,M (Madalitso)	4	2	0	2	1	0	2	1	0	0	0	0
2	Ramonyaluoe ,M (Madalitso)	4	1444.2	1444.2	2	1501.2	1444.2	2	1309.4	1444.2	0	0	0
3	Klopper ,E (Elbe)	4	3	212.5	1	1	425	3	2	141.7	0	0	0
3	Klopper ,E (Elbe)	4	1240.3	1452.8	1	1373.4	1665.3	3	1213.1	1381.9	0	0	0
4	Van Wyk ,A (Alonzo)	4	4	425	1	1	425	3	3	425	0	0	0
4	Van Wyk ,A (Alonzo)	4	1188.2	1613.2	1	1136.8	1613.2	3	1200	1613.2	0	0	0
5	Kruger ,J (Josua Baruch)	3	0	-425	2	0	-425	1	0	-425	0	0	0
5	Kruger ,J (Josua Baruch)	3	1466.6	1041.6	2	1586.9	1041.6	1	1226.4	1041.6	0	0	0
6	Baker ,A (Andrew)	3	0	-425	2	0	-425	1	0	-425	0	0	0
6	Baker ,A (Andrew)	3	1400.1	975.1	2	1286.3	975.1	1	1386.8	975.1	0	0	0
7	Van Der Merwe ,S (Schalk Wolf)	3	0	-425	1	0	-425	2	0	-425	0	0	0
7	Van Der Merwe ,S (Schalk Wolf)	3	1570.3	1145.3	1	1486.6	1145.3	2	1689.2	1145.3	0	0	0
8	Chang ,C (Caelem)	3	3	425	1	1	425	2	2	425	0	0	0
8	Chang ,C (Caelem)	3	1216.5	1641.5	1	1212.1	1641.5	2	1194.1	1641.5	0	0	0
9	Balogun ,S (Samuel)	3	1.5	0	1	0	-425	2	1.5	212.5	0	0	0
9	Balogun ,S (Samuel)	3	1341.3	1341.3	1	1360.4	916.3	2	1206.4	1553.8	0	0	0
10	Michaelides ,G (George)	3	0.5	-283.3	1	0.5	0	2	0	-425	0	0	0
10	Michaelides ,G (George)	3	1238.7	955.3	1	1307.1	1238.7	2	1205.2	813.7	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

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Zwartz, Z (Zeke)

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Top 3 Streaks

Top 10 opponents most often played

Norms