Chess South Africa Ratings Database

PLAYER PAGE

Personal

Stock, Z (Zack)

Chess SA id

1120146892

FIDE id

Date of birth

2012-12-21 (U14)

Gender

Male

Region

Cape Town (WCT)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-10-11

Personal details last changed

1900-01-01

Junior GPX Games

24.5

Junior GPX Points

1115.1

Item	Main	Standard	Rapid	Blitz
Rating	1258.8	1187.2	1326.4	1200
Raw rating	1258.8	1187.2	1324.6	1200
Weighted rating	1243.4	1185	1326.4	1200
Weighted performance	1114	995.6	0	0
Floor	791.4	748.2	834	700
K-factor	36	36	36	36
Min/Max rating change allowed	152.5	168.9	138.8	165.8
Highest rating	1356.9 2023-09-01	1248.2 2024-03-01	1640.6 2023-07-01	1200 2018-10-01
Highest raw rating	1291.4 2024-08-01	1248.2 2024-03-01	1334 2024-08-01	1200 2024-02-01
Highest weighted rating	1291.4 2024-10-01	1248.2 2024-09-01	1326.4 2025-11-01	1200 2018-10-01
Highest weighted performance	1356.9 2023-09-01	1210.4 2024-02-01	1640.6 2023-07-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0.8	0
New rating	1258.8	1187.2	1327.2	1200
Analysis
Rating	1258.8	1187.2	1326.4	1200
Raw rating	1258.8	1187.2	1324.6	1200
Weighted rating	1243.4	1185	1326.4
Weighted performance	1114	995.6	0
K-factor	36	36	36	36
Floor	791.4	748.2	834	700
Max/Min rating change allowed	152.5	168.9	138.8	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	1258.8	1187.2	1324.6	1200
New weighted rating	1244.2	1184.4	1327.2	1200
New weighted performance	1107.2	989.2	0	0
Temp new rating	1258.8	1187.2	1327.2	1200
Temp new rating +/-	0	0	0.8	0
Final new rating +/-	0	0	0.8	0
New rating	1258.8	1187.2	1327.2	1200
New K-factor	36	36	36	36
New floor	791.4	748.2	834	700

Item	Main	Standard	Rapid
	0	0	0
	22	16	6
	26	21	5
	10	6	4
	2	2	0
	0	0	0
History	60	45	15

Games since
	Main 48	Standard 37		Rapid 11		Blitz 0
Gender	Male
Age group	U14
Region	Cape Town (WCT)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	3638		1206		479
Male	2790		878		376
U14	690		225		92
U14 Male	493		148		65
Standard
	RSA		Province		Region
Overall	4168		1184		469
Male	3099		805		347
U14	817		222		94
U14 Male	561		132		61
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	22	9	40.91	-77.3	1291.2	1213.9
Standard	16	6	37.5	-106.2	1266.1	1159.9
Rapid	6	3	50	0	1357.9	1357.9
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	60	27.5	45.83	-35.4	1282.3	1246.9
Standard	45	16	35.56	-122.8	1288.9	1166.1
Rapid	15	11.5	76.67	226.7	1262.5	1489.2
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-11-01	1258.8	1187.2	1324.6	1200
2025-09-30	1243.5	1187.2	1334	1200
2025-09-01	1243.5	1187.2	1334	1200
2025-08-01	1243.5	1187.2	1334	1200
2025-07-01	1241.3	1185.6	1334	1200
2025-06-01	1244.7	1193.3	1334	1200
2025-05-01	1244.7	1193.3	1334	1200
2025-04-01	1244.4	1193.3	1334	1200
2025-03-01	1243.6	1193.3	1334	1200
2025-02-01	1239.9	1184.5	1334	1200
2025-01-01	1194.5	1119.3	1334	1200
2024-12-01	1194.5	1119.3	1334	1200
2024-11-01	1194.5	1119.3	1334	1200
2024-10-01	1249.6	1172.6	1334	1200
2024-09-01	1291.4	1215.8	1334	1200
2024-08-01	1291.4	1215.8	1334	1200
2024-07-01	1254.5	1215.8	1276.8	1200
2024-09-01	1254.5	1215.8	1276.8	1200
2024-05-01	1254.5	1215.8	1276.8	1200
2024-04-01	1254.5	1215.8	1276.8	1200
2024-03-01	1281.7	1248.2	1276.8	1200
2024-02-01	1266.2	1228.4	1276.8	1200
2024-01-01	1266.2	1228.4	1276.8	1200
2023-12-01	1266.2	1228.4	1276.8	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	UCT Open Chess Championship 2025 (U14)	2025-10-11	2025-10-11	Rapid	Cape Town (WCT)	6	6	3	Yes	Analysis
2	Cape Town Chess Junior League 2025 (U14)	2025-05-10	2025-05-31	Standard	Cape Town (WCT)	6	5	1	Yes	Analysis
3	District South Schools Chess Individual Trials 2025 (U13 Open)	2025-02-01	2025-02-02	Standard	Cape Town (WCT)	6	6	3	Yes	Analysis
4	Helderberg Chess Club PS Development Tournament 2025 (U13 Boys)	2025-01-25	2025-01-25	Standard	Cape Town (WCT)	5	5	2	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	UCT Open Chess Championship 2025 (U14)	2025-10-11	2025-10-11	Rapid	Cape Town (WCT)	6	6	3	Yes	Analysis
2	Cape Town Chess Junior League 2025 (U14)	2025-05-10	2025-05-31	Standard	Cape Town (WCT)	6	5	1	Yes	Analysis
3	District South Schools Chess Individual Trials 2025 (U13 Open)	2025-02-01	2025-02-02	Standard	Cape Town (WCT)	6	6	3	Yes	Analysis
4	Helderberg Chess Club PS Development Tournament 2025 (U13 Boys)	2025-01-25	2025-01-25	Standard	Cape Town (WCT)	5	5	2	Yes	Analysis
5	UCT Open Chess Championship 2024 (Intermediate)	2024-10-12	2024-10-13	Standard	Cape Town (WCT)	6	6	1	Yes	Analysis
6	Western Cape Top Schools Championship 2024 (U13 Mixed)	2024-08-30	2024-09-01	Standard	Eden (WEG)	6	4	0	Yes	Analysis
7	Metro South Top Schools 2024 (U13)	2024-07-27	2024-07-28	Rapid	Cape Town (WCT)	5	5	4.5	Yes	Analysis
8	Cape Town Metro Schools Chess Closed Individuals 2024 (U13 Boys)	2024-03-02	2024-03-03	Standard	Cape Town (WCT)	6	6	2	Yes	Analysis
9	District South Schools Chess Individual Trials 2024 (U13 Boys)	2024-02-03	2024-02-03	Standard	Cape Town (WCT)	5	5	3	Yes	Analysis
10	Western Cape Top Schools 2023 (U11 Mixed)	2023-09-02	2023-09-03	Standard	Cape Winelands (WCW)	6	6	4	Yes	Analysis
11	CT Metro District South Top Schools 2023 (U9+U11 Mixed + U13 Girls)	2023-07-29	2023-07-29	Rapid	Cape Town (WCT)	5	4	4	Yes	Analysis
12	2022 Western Province Club League (Junior)	2022-08-27	2022-09-17	Standard	Cape Town (WCT)	7	2	0	Yes	Analysis

#	Games	Start				End
1	6	Tournament CT Metro District South Top Schools 2023				Tournament Western Cape Top Schools 2023
		date 2023-07-29	rnd 1	type Rapid	result 1	date 2023-09-02	rnd 2	type Standard	result 1
		Opponent Abrahams, A (Amani)				Opponent Buhr, G (Gretchen)
2	5	Tournament Metro South Top Schools 2024				Tournament Metro South Top Schools 2024
		date 2024-07-27	rnd 1	type Rapid	result 1	date 2024-07-28	rnd 5	type Rapid	result 0.5
		Opponent Abbas, M (Mahir)				Opponent Van Eeden, L (Louis)
3	3	Tournament District South Schools Chess Individual Trials 2024				Tournament District South Schools Chess Individual Trials 2024
		date 2024-02-03	rnd 2	type Standard	result 1	date 2024-02-03	rnd 4	type Standard	result 1
		Opponent Dodgen, Z (Zach)				Opponent Morrison, L (Liam)

#	Games	Start				End
1	3	Tournament District South Schools Chess Individual Trials 2024				Tournament District South Schools Chess Individual Trials 2024
		date 2024-02-03	rnd 2	type Standard	result 1	date 2024-02-03	rnd 4	type Standard	result 1
		Opponent Dodgen, Z (Zach)				Opponent Morrison, L (Liam)
2	2	Tournament District South Schools Chess Individual Trials 2025				Tournament District South Schools Chess Individual Trials 2025
		date 2025-02-01	rnd 2	type Standard	result 1	date 2025-02-01	rnd 3	type Standard	result 1
		Opponent Callaghan, H (Hakim)				Opponent Van der Schyff, Y (Yaseen)
3	2	Tournament Helderberg Chess Club PS Development Tournament 2025				Tournament Helderberg Chess Club PS Development Tournament 2025
		date 2025-01-25	rnd 2	type Standard	result 1	date 2025-01-25	rnd 3	type Standard	result 1
		Opponent Makumbe, P (Passion)				Opponent Baard, R (Riedewaan)

#	Games	Start				End
1	9	Tournament CT Metro District South Top Schools 2023				Tournament Metro South Top Schools 2024
		date 2023-07-29	rnd 1	type Rapid	result 1	date 2024-07-28	rnd 5	type Rapid	result 0.5
		Opponent Abrahams, A (Amani)				Opponent Van Eeden, L (Louis)

No games found.

#	Games	Start				End

#	Games	Start				End
1	6	Tournament CT Metro District South Top Schools 2023				Tournament Western Cape Top Schools 2023
		date 2023-07-29	rnd 1	type Rapid	result 1	date 2023-09-02	rnd 2	type Standard	result 1
		Opponent Abrahams, A (Amani)				Opponent Buhr, G (Gretchen)
2	4	Tournament Metro South Top Schools 2024				Tournament Metro South Top Schools 2024
		date 2024-07-27	rnd 1	type Rapid	result 1	date 2024-07-28	rnd 4	type Rapid	result 1
		Opponent Abbas, M (Mahir)				Opponent Mlimisi, O (Onako)
3	3	Tournament District South Schools Chess Individual Trials 2024				Tournament District South Schools Chess Individual Trials 2024
		date 2024-02-03	rnd 2	type Standard	result 1	date 2024-02-03	rnd 4	type Standard	result 1
		Opponent Dodgen, Z (Zach)				Opponent Morrison, L (Liam)

#	Games	Start				End
1	3	Tournament District South Schools Chess Individual Trials 2024				Tournament District South Schools Chess Individual Trials 2024
		date 2024-02-03	rnd 2	type Standard	result 1	date 2024-02-03	rnd 4	type Standard	result 1
		Opponent Dodgen, Z (Zach)				Opponent Morrison, L (Liam)
2	2	Tournament District South Schools Chess Individual Trials 2025				Tournament District South Schools Chess Individual Trials 2025
		date 2025-02-01	rnd 2	type Standard	result 1	date 2025-02-01	rnd 3	type Standard	result 1
		Opponent Callaghan, H (Hakim)				Opponent Van der Schyff, Y (Yaseen)
3	2	Tournament Helderberg Chess Club PS Development Tournament 2025				Tournament Helderberg Chess Club PS Development Tournament 2025
		date 2025-01-25	rnd 2	type Standard	result 1	date 2025-01-25	rnd 3	type Standard	result 1
		Opponent Makumbe, P (Passion)				Opponent Baard, R (Riedewaan)

#	Games	Start				End
1	8	Tournament CT Metro District South Top Schools 2023				Tournament Metro South Top Schools 2024
		date 2023-07-29	rnd 1	type Rapid	result 1	date 2024-07-28	rnd 4	type Rapid	result 1
		Opponent Abrahams, A (Amani)				Opponent Mlimisi, O (Onako)

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	Morrison ,L (Liam)	2	2	425	2	2	425	0	0	0	0	0	0
1	Morrison ,L (Liam)	2	1249.1	1674.1	2	1215	1674.1	0	0	0	0	0	0
2	Van Zyl ,F (Frede)	2	0	-425	2	0	-425	0	0	0	0	0	0
2	Van Zyl ,F (Frede)	2	1319.2	894.2	2	1291.6	894.2	0	0	0	0	0	0
3	Shasha ,I (Iyanda)	2	0	-425	2	0	-425	0	0	0	0	0	0
3	Shasha ,I (Iyanda)	2	1347.4	922.4	2	1294	922.4	0	0	0	0	0	0
4	Thomson ,A (Alexander)	1	0	-425	1	0	-425	0	0	0	0	0	0
4	Thomson ,A (Alexander)	1	1298.6	873.6	1	1194.3	873.6	0	0	0	0	0	0
5	Mnguni ,Z (Ziyahluma)	1	0	-425	1	0	-425	0	0	0	0	0	0
5	Mnguni ,Z (Ziyahluma)	1	1200	775	1	1200	775	0	0	0	0	0	0
6	Pfaff ,R (Ruben)	1	0	-425	1	0	-425	0	0	0	0	0	0
6	Pfaff ,R (Ruben)	1	1327.7	902.7	1	1262.8	902.7	0	0	0	0	0	0
7	Pentz ,J (Jason)	1	1	425	1	1	425	0	0	0	0	0	0
7	Pentz ,J (Jason)	1	1396.7	1821.7	1	1383.1	1821.7	0	0	0	0	0	0
8	Moodley ,K (Kartar)	1	0	-425	1	0	-425	0	0	0	0	0	0
8	Moodley ,K (Kartar)	1	1422.9	997.9	1	1335.2	997.9	0	0	0	0	0	0
9	Anderson ,J (Jean)	1	0	-425	1	0	-425	0	0	0	0	0	0
9	Anderson ,J (Jean)	1	1321.2	896.2	1	1210.6	896.2	0	0	0	0	0	0
10	Arendse ,V (Virgil)	1	0	-425	1	0	-425	0	0	0	0	0	0
10	Arendse ,V (Virgil)	1	1374.1	949.1	1	1324.6	949.1	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

Stock, Z (Zack)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms