Chess South Africa Ratings Database

PLAYER PAGE

Personal

De Koker, Z (Zian)

Chess SA id

1120138748

FIDE id

Date of birth

2012-06-26 (U14)

Gender

Male

Region

Cape Town (WCT)

Citizen

RSA

Titles

Chess SA registered

Last active game

2023-02-04

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1218.5	1193.2	1242.4	1200
Raw rating	1218.5	1193.2	1242.4	1200
Weighted rating	1218.5	1193.2	1242.4	1200
Weighted performance	0	0	0	0
Floor	730.5	700	742.4	700
K-factor	36	36	36	36
Min/Max rating change allowed	161.5	167.4	156.1	165.8
Highest rating	1284.6 2022-03-01	1200 2018-10-01	1356 2022-03-01	1200 2018-10-01
Highest raw rating	1230.5 2022-04-01	1200 2020-01-01	1242.4 2024-02-01	1200 2024-02-01
Highest weighted rating	1230.5 2025-02-01	1200 2018-10-01	1242.4 2025-02-01	1200 2018-10-01
Highest weighted performance	1284.6 2022-03-01	1200 2020-01-01	1356 2022-03-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1218.5	1193.2	1242.4	1200
Analysis
Rating	1218.5	1193.2	1242.4	1200
Raw rating	1218.5	1193.2	1242.4	1200
Weighted rating	1218.5	1193.2	1242.4
Weighted performance	0	0	0
K-factor	36	36	36	36
Floor	730.5	700	742.4	700
Max/Min rating change allowed	161.5	167.4	156.1	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	1218.5	1193.2	1242.4	1200
New weighted rating	1218.5	1193.2	1242.4	1200
New weighted performance	0	0	0	0
Temp new rating	1218.5	1193.2	1242.4	1200
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1218.5	1193.2	1242.4	1200
New K-factor	36	36	36	36
New floor	730.5	700	742.4	700

Item	Main	Standard	Rapid
	0	0	0
	0	0	0
	0	0	0
	6	6	0
	12	6	6
	0	0	0
History	18	12	6

Games since
	Main 0	Standard 0		Rapid 0		Blitz 0
Gender	Male
Age group	U14
Region	Cape Town (WCT)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U14	-1		-1		-1
U14 Male	-1		-1		-1
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U14	-1		-1		-1
U14 Male	-1		-1		-1
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	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
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	18	9.5	52.78	23.6	1217.7	1241.3
Standard	12	5.5	45.83	-35.4	1224.1	1188.7
Rapid	6	4	66.67	141.7	1205	1346.7
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-09-30	1218.5	1193.2	1242.4	1200
2025-09-01	1218.5	1193.2	1242.4	1200
2025-08-01	1218.5	1193.2	1242.4	1200
2025-07-01	1218.5	1193.2	1242.4	1200
2025-06-01	1218.5	1193.2	1242.4	1200
2025-05-01	1218.5	1193.2	1242.4	1200
2025-04-01	1218.5	1193.2	1242.4	1200
2025-03-01	1218.5	1193.2	1242.4	1200
2025-02-01	1218.5	1193.2	1242.4	1200
2025-01-01	1218.5	1193.2	1242.4	1200
2024-12-01	1218.5	1193.2	1242.4	1200
2024-11-01	1218.5	1193.2	1242.4	1200
2024-10-01	1218.5	1193.2	1242.4	1200
2024-09-01	1218.5	1193.2	1242.4	1200
2024-08-01	1218.5	1193.2	1242.4	1200
2024-07-01	1218.5	1193.2	1242.4	1200
2024-06-01	1218.5	1193.2	1242.4	1200
2024-08-01	1218.5	1193.2	1242.4	1200
2024-04-01	1218.5	1193.2	1242.4	1200
2024-03-01	1218.5	1193.2	1242.4	1200
2024-02-01	1218.5	1193.2	1242.4	1200
2024-01-01	1218.5	1193.2	1242.4	1200
2023-12-01	1218.5	1193.2	1242.4	1200
2023-11-01	1218.5	1193.2	1242.4	1200

Comming soon.

Tournaments

History

No tournaments found.

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis

No tournaments found.

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	District East Schools Chess Individual Trials 2023 (U11 Boys)	2023-02-03	2023-02-04	Standard	Cape Town (WCT)	6	6	3.5	Yes	Analysis
2	Metro WP Schools Chess Trials 2022 (U11 Boys)	2022-04-22	2022-04-23	Standard	Cape Town (WCT)	6	6	2	Yes	Analysis
3	2022 East Dist Individuals (U11)	2022-03-13	2022-03-13	Rapid	Cape Town (WCT)	6	6	4	Yes	Analysis

#	Games	Start				End
1	3	Tournament District East Schools Chess Individual Trials 2023				Tournament District East Schools Chess Individual Trials 2023
		date 2023-02-04	rnd 4	type Standard	result 1	date 2023-02-04	rnd 6	type Standard	result 1
		Opponent Harding, J (Jodie)				Opponent Janya, E (Endinako)
2	2	Tournament Metro WP Schools Chess Trials 2022				Tournament Metro WP Schools Chess Trials 2022
		date 2022-04-23	rnd 4	type Standard	result 1	date 2022-04-23	rnd 5	type Standard	result 1
		Opponent Mafilika, O (Onikayo)				Opponent Solomons, C (Christanzo)
3	2	Tournament 2022 East Dist Individuals				Tournament 2022 East Dist Individuals
		date 2022-03-13	rnd 3	type Rapid	result 1	date 2022-03-13	rnd 4	type Rapid	result 1
		Opponent Nyumbeka, V (Velile Samuel Junior)				Opponent Ganjana, N (Namndikhona)

#	Games	Start				End
1	3	Tournament District East Schools Chess Individual Trials 2023				Tournament District East Schools Chess Individual Trials 2023
		date 2023-02-04	rnd 4	type Standard	result 1	date 2023-02-04	rnd 6	type Standard	result 1
		Opponent Harding, J (Jodie)				Opponent Janya, E (Endinako)
2	2	Tournament Metro WP Schools Chess Trials 2022				Tournament Metro WP Schools Chess Trials 2022
		date 2022-04-23	rnd 4	type Standard	result 1	date 2022-04-23	rnd 5	type Standard	result 1
		Opponent Mafilika, O (Onikayo)				Opponent Solomons, C (Christanzo)
3	1	Tournament District East Schools Chess Individual Trials 2023				Tournament District East Schools Chess Individual Trials 2023
		date 2023-02-03	rnd 1	type Standard	result 1	date 2023-02-03	rnd 1	type Standard	result 1
		Opponent Herman, V (Victor)				Opponent Herman, V (Victor)

#	Games	Start				End
1	2	Tournament 2022 East Dist Individuals				Tournament 2022 East Dist Individuals
		date 2022-03-13	rnd 3	type Rapid	result 1	date 2022-03-13	rnd 4	type Rapid	result 1
		Opponent Nyumbeka, V (Velile Samuel Junior)				Opponent Ganjana, N (Namndikhona)
2	1	Tournament 2022 East Dist Individuals				Tournament 2022 East Dist Individuals
		date 2022-03-13	rnd 6	type Rapid	result 1	date 2022-03-13	rnd 6	type Rapid	result 1
		Opponent Kruger, D (Dawid)				Opponent Kruger, D (Dawid)
3	1	Tournament 2022 East Dist Individuals				Tournament 2022 East Dist Individuals
		date 2022-03-13	rnd 1	type Rapid	result 1	date 2022-03-13	rnd 1	type Rapid	result 1
		Opponent Scott, M (Markal)				Opponent Scott, M (Markal)

No games found.

#	Games	Start				End

#	Games	Start				End
1	2	Tournament Metro WP Schools Chess Trials 2022				Tournament Metro WP Schools Chess Trials 2022
		date 2022-04-23	rnd 4	type Standard	result 1	date 2022-04-23	rnd 5	type Standard	result 1
		Opponent Mafilika, O (Onikayo)				Opponent Solomons, C (Christanzo)
2	2	Tournament 2022 East Dist Individuals				Tournament 2022 East Dist Individuals
		date 2022-03-13	rnd 3	type Rapid	result 1	date 2022-03-13	rnd 4	type Rapid	result 1
		Opponent Nyumbeka, V (Velile Samuel Junior)				Opponent Ganjana, N (Namndikhona)
3	1	Tournament District East Schools Chess Individual Trials 2023				Tournament District East Schools Chess Individual Trials 2023
		date 2023-02-04	rnd 6	type Standard	result 1	date 2023-02-04	rnd 6	type Standard	result 1
		Opponent Janya, E (Endinako)				Opponent Janya, E (Endinako)

#	Games	Start				End
1	2	Tournament Metro WP Schools Chess Trials 2022				Tournament Metro WP Schools Chess Trials 2022
		date 2022-04-23	rnd 4	type Standard	result 1	date 2022-04-23	rnd 5	type Standard	result 1
		Opponent Mafilika, O (Onikayo)				Opponent Solomons, C (Christanzo)
2	1	Tournament District East Schools Chess Individual Trials 2023				Tournament District East Schools Chess Individual Trials 2023
		date 2023-02-04	rnd 6	type Standard	result 1	date 2023-02-04	rnd 6	type Standard	result 1
		Opponent Janya, E (Endinako)				Opponent Janya, E (Endinako)
3	1	Tournament District East Schools Chess Individual Trials 2023				Tournament District East Schools Chess Individual Trials 2023
		date 2023-02-04	rnd 4	type Standard	result 1	date 2023-02-04	rnd 4	type Standard	result 1
		Opponent Harding, J (Jodie)				Opponent Harding, J (Jodie)

#	Games	Start				End
1	2	Tournament 2022 East Dist Individuals				Tournament 2022 East Dist Individuals
		date 2022-03-13	rnd 3	type Rapid	result 1	date 2022-03-13	rnd 4	type Rapid	result 1
		Opponent Nyumbeka, V (Velile Samuel Junior)				Opponent Ganjana, N (Namndikhona)
2	1	Tournament 2022 East Dist Individuals				Tournament 2022 East Dist Individuals
		date 2022-03-13	rnd 6	type Rapid	result 1	date 2022-03-13	rnd 6	type Rapid	result 1
		Opponent Kruger, D (Dawid)				Opponent Kruger, D (Dawid)
3	1	Tournament 2022 East Dist Individuals				Tournament 2022 East Dist Individuals
		date 2022-03-13	rnd 1	type Rapid	result 1	date 2022-03-13	rnd 1	type Rapid	result 1
		Opponent Scott, M (Markal)				Opponent Scott, M (Markal)

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	Harding ,J (Jodie)	1	1	425	1	1	425	0	0	0	0	0	0
1	Harding ,J (Jodie)	1	1156.8	1581.8	1	1200	1581.8	0	0	0	0	0	0
2	Muller ,H (Helgard)	1	0	-425	1	0	-425	0	0	0	0	0	0
2	Muller ,H (Helgard)	1	1304.9	879.9	1	1263.1	879.9	0	0	0	0	0	0
3	Arendse ,V (Virgil)	1	0	-425	1	0	-425	0	0	0	0	0	0
3	Arendse ,V (Virgil)	1	1200	775	1	1200	775	0	0	0	0	0	0
4	Lee ,S (Shakoor)	1	0	-425	1	0	-425	0	0	0	0	0	0
4	Lee ,S (Shakoor)	1	1175.8	750.8	1	1146.3	750.8	0	0	0	0	0	0
5	Janya ,E (Endinako)	1	1	425	1	1	425	0	0	0	0	0	0
5	Janya ,E (Endinako)	1	1200	1625	1	1200	1625	0	0	0	0	0	0
6	Van Zyl ,F (Frede)	1	0	-425	1	0	-425	0	0	0	0	0	0
6	Van Zyl ,F (Frede)	1	1221.2	796.2	1	1178.4	796.2	0	0	0	0	0	0
7	Schutte ,D (Daniel)	1	0	-425	1	0	-425	0	0	0	0	0	0
7	Schutte ,D (Daniel)	1	1201.2	776.2	1	1146.9	776.2	0	0	0	0	0	0
8	Herman ,V (Victor)	1	1	425	1	1	425	0	0	0	0	0	0
8	Herman ,V (Victor)	1	1204.3	1629.3	1	1200	1629.3	0	0	0	0	0	0
9	Weideman ,J (Janko)	1	0	-425	1	0	-425	0	0	0	0	0	0
9	Weideman ,J (Janko)	1	1379.6	954.6	1	1328	954.6	0	0	0	0	0	0
10	Solomons ,C (Christanzo)	1	1	425	1	1	425	0	0	0	0	0	0
10	Solomons ,C (Christanzo)	1	1198.3	1623.3	1	1200	1623.3	0	0	0	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

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PLAYER PAGE

Personal

De Koker, Z (Zian)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms