Chess South Africa Ratings Database

PLAYER PAGE

Personal

Koert, I (Isaac)

Chess SA id

1060132969

FIDE id

Date of birth

2006-01-01 (U20)

Gender

Male

Region

Cape Town (WCT)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-09-27

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1456.5	1434.7	1306.1	1200
Raw rating	1456.5	1434.7	1306.1	1200
Weighted rating	1364.8	1339.2	1298	1200
Weighted performance	0	0	0	0
Floor	956.5	934.7	806.1	700
K-factor	32	32	36	36
Min/Max rating change allowed	115.1	118.7	142.6	165.8
Highest rating	1521.9 2020-03-01	1516.1 2020-03-01	1506.1 2024-07-01	1200 2018-10-01
Highest raw rating	1456.5 2025-11-01	1434.7 2025-11-01	1306.1 2024-08-01	1200 2024-02-01
Highest weighted rating	1364.8 2025-11-01	1339.2 2025-11-01	1291.2 2025-08-01	1200 2018-10-01
Highest weighted performance	1521.9 2020-03-01	1516.1 2020-03-01	1506.1 2024-07-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1456.5	1434.7	1306.1	1200
Analysis
Rating	1456.5	1434.7	1306.1	1200
Raw rating	1456.5	1434.7	1306.1	1200
Weighted rating	1364.8	1339.2	1298
Weighted performance	0	0	0
K-factor	32	32	36	36
Floor	956.5	934.7	806.1	700
Max/Min rating change allowed	115.1	118.7	142.6	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	1456.5	1434.7	1306.1	1200
New weighted rating	1373.5	1347.6	1299.8	1200
New weighted performance	0	0	0	0
Temp new rating	1456.5	1434.7	1306.1	1200
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1456.5	1434.7	1306.1	1200
New K-factor	32	32	36	36
New floor	956.5	934.7	806.1	700

Item	Main	Standard	Rapid
	0	0	0
	7	7	0
	9	5	4
	6	0	6
	0	0	0
	0	0	0
History	27	17	10

Games since
	Main 16	Standard 12		Rapid 4		Blitz 0
Gender	Male
Age group	U20
Region	Cape Town (WCT)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U20	-1		-1		-1
U20 Male	-1		-1		-1
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U20	-1		-1		-1
U20 Male	-1		-1		-1
Rapid
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U20	-1		-1		-1
U20 Male	-1		-1		-1
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U20	-1		-1		-1
U20 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	7	5.5	78.57	242.9	1422.1	1665
Standard	7	5.5	78.57	242.9	1422.1	1665
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	27	21.5	79.63	251.9	1308.5	1560.3
Standard	17	13.5	79.41	250	1342.8	1592.8
Rapid	10	8	80	255	1250	1505
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-11-01	1456.5	1434.7	1306.1	1200
2025-09-30	1362.9	1332.1	1306.1	1200
2025-09-01	1362.9	1332.1	1306.1	1200
2025-08-01	1362.9	1332.1	1306.1	1200
2025-07-01	1362.9	1332.1	1306.1	1200
2025-06-01	1362.9	1332.1	1306.1	1200
2025-05-01	1362.9	1332.1	1306.1	1200
2025-04-01	1362.9	1332.1	1306.1	1200
2025-03-01	1362.9	1332.1	1306.1	1200
2025-02-01	1362.9	1332.1	1306.1	1200
2025-01-01	1362.9	1332.1	1306.1	1200
2024-12-01	1362.9	1332.1	1306.1	1200
2024-11-01	1362.9	1332.1	1306.1	1200
2024-10-01	1362.9	1332.1	1306.1	1200
2024-09-01	1362.9	1332.1	1306.1	1200
2024-08-01	1362.9	1332.1	1306.1	1200
2024-07-01	1324.7	1332.1	1238.8	1200
2024-09-01	1324.7	1332.1	1238.8	1200
2024-05-01	1324.7	1332.1	1238.8	1200
2024-04-01	1324.7	1332.1	1238.8	1200
2024-03-01	1324.7	1332.1	1238.8	1200
2024-02-01	1274.8	1275.2	1238.8	1200
2024-01-01	1274.8	1275.2	1238.8	1200
2023-12-01	1274.8	1275.2	1238.8	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	Cape Town Chess Federation Club League 2025 (B)	2025-07-26	2025-09-27	Standard	Cape Town (WCT)	11	2	2	Yes	Analysis
2	Cape Town Chess Federation Club League 2025 (C)	2025-07-26	2025-09-27	Standard	Cape Town (WCT)	11	5	3.5	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Cape Town Chess Federation Club League 2025 (B)	2025-07-26	2025-09-27	Standard	Cape Town (WCT)	11	2	2	Yes	Analysis
2	Cape Town Chess Federation Club League 2025 (C)	2025-07-26	2025-09-27	Standard	Cape Town (WCT)	11	5	3.5	Yes	Analysis
3	CT District North Top Schools 2024 (U18 Mixed)	2024-07-27	2024-07-27	Rapid	Cape Town (WCT)	5	4	4	Yes	Analysis
4	North District School Trials 2024 (U18 Boys)	2024-02-03	2024-02-03	Standard	Cape Town (WCT)	5	5	3.5	Yes	Analysis
5	Chess@libraries 2023	2023-10-05	2023-10-05	Rapid	Cape Town (WCT)	6	6	4	Yes	Analysis
6	2020 Western Province Open (Development)	2020-03-07	2020-03-07	Standard	Cape Town (WCT)	5	5	4.5	Yes	Analysis

#	Games	Start				End
1	12	Tournament North District School Trials 2024				Tournament Cape Town Chess Federation Club League 2025
		date 2024-02-03	rnd 4	type Standard	result 1	date 2025-09-13	rnd 8	type Standard	result 1
		Opponent Simayile, I (Isiphilinkosi)				Opponent Slamang, MK (Mohammed Kassiem)
2	6	Tournament 2020 Western Province Open				Tournament Chess@libraries 2023
		date 2020-03-07	rnd 1	type Standard	result 1	date 2023-10-05	rnd 1	type Rapid	result 1
		Opponent Matthee, M (Matthew)				Opponent Mthlnianu, O (Onga)
3	4	Tournament Chess@libraries 2023				Tournament North District School Trials 2024
		date 2023-10-05	rnd 5	type Rapid	result 1	date 2024-02-03	rnd 2	type Standard	result 0.5
		Opponent Hay, L (Luqmaan)				Opponent Dicks, D (Drake)

#	Games	Start				End
1	7	Tournament 2020 Western Province Open				Tournament North District School Trials 2024
		date 2020-03-07	rnd 1	type Standard	result 1	date 2024-02-03	rnd 2	type Standard	result 0.5
		Opponent Matthee, M (Matthew)				Opponent Dicks, D (Drake)
2	2	Tournament North District School Trials 2024				Tournament North District School Trials 2024
		date 2024-02-03	rnd 4	type Standard	result 1	date 2024-02-03	rnd 5	type Standard	result 1
		Opponent Simayile, I (Isiphilinkosi)				Opponent Solomon, D (Daniel)

#	Games	Start				End
1	6	Tournament Chess@libraries 2023				Tournament CT District North Top Schools 2024
		date 2023-10-05	rnd 5	type Rapid	result 1	date 2024-07-27	rnd 5	type Rapid	result 1
		Opponent Hay, L (Luqmaan)				Opponent Williams, R (Reinaert)
2	1	Tournament Chess@libraries 2023				Tournament Chess@libraries 2023
		date 2023-10-05	rnd 3	type Rapid	result 1	date 2023-10-05	rnd 3	type Rapid	result 1
		Opponent Hendricks, Y (Yusuf)				Opponent Hendricks, Y (Yusuf)
3	1	Tournament Chess@libraries 2023				Tournament Chess@libraries 2023
		date 2023-10-05	rnd 1	type Rapid	result 1	date 2023-10-05	rnd 1	type Rapid	result 1
		Opponent Mthlnianu, O (Onga)				Opponent Mthlnianu, O (Onga)

No games found.

#	Games	Start				End

#	Games	Start				End
1	6	Tournament North District School Trials 2024				Tournament CT District North Top Schools 2024
		date 2024-02-03	rnd 4	type Standard	result 1	date 2024-07-27	rnd 5	type Rapid	result 1
		Opponent Simayile, I (Isiphilinkosi)				Opponent Williams, R (Reinaert)
2	4	Tournament 2020 Western Province Open				Tournament Chess@libraries 2023
		date 2020-03-07	rnd 3	type Standard	result 1	date 2023-10-05	rnd 1	type Rapid	result 1
		Opponent Isaacs, Z (Zeiyaad)				Opponent Mthlnianu, O (Onga)
3	3	Tournament Chess@libraries 2023				Tournament North District School Trials 2024
		date 2023-10-05	rnd 5	type Rapid	result 1	date 2024-02-03	rnd 1	type Standard	result 1
		Opponent Hay, L (Luqmaan)				Opponent Somai, R (Ruhan)

#	Games	Start				End
1	4	Tournament 2020 Western Province Open				Tournament North District School Trials 2024
		date 2020-03-07	rnd 3	type Standard	result 1	date 2024-02-03	rnd 1	type Standard	result 1
		Opponent Isaacs, Z (Zeiyaad)				Opponent Somai, R (Ruhan)
2	2	Tournament North District School Trials 2024				Tournament North District School Trials 2024
		date 2024-02-03	rnd 4	type Standard	result 1	date 2024-02-03	rnd 5	type Standard	result 1
		Opponent Simayile, I (Isiphilinkosi)				Opponent Solomon, D (Daniel)
3	1	Tournament 2020 Western Province Open				Tournament 2020 Western Province Open
		date 2020-03-07	rnd 1	type Standard	result 1	date 2020-03-07	rnd 1	type Standard	result 1
		Opponent Matthee, M (Matthew)				Opponent Matthee, M (Matthew)

#	Games	Start				End
1	6	Tournament Chess@libraries 2023				Tournament CT District North Top Schools 2024
		date 2023-10-05	rnd 5	type Rapid	result 1	date 2024-07-27	rnd 5	type Rapid	result 1
		Opponent Hay, L (Luqmaan)				Opponent Williams, R (Reinaert)
2	1	Tournament Chess@libraries 2023				Tournament Chess@libraries 2023
		date 2023-10-05	rnd 3	type Rapid	result 1	date 2023-10-05	rnd 3	type Rapid	result 1
		Opponent Hendricks, Y (Yusuf)				Opponent Hendricks, Y (Yusuf)
3	1	Tournament Chess@libraries 2023				Tournament Chess@libraries 2023
		date 2023-10-05	rnd 1	type Rapid	result 1	date 2023-10-05	rnd 1	type Rapid	result 1
		Opponent Mthlnianu, O (Onga)				Opponent Mthlnianu, O (Onga)

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	Matthee ,M (Matthew)	1	1	425	1	1	425	0	0	0	0	0	0
1	Matthee ,M (Matthew)	1	1149.2	1574.2	1	1137.2	1574.2	0	0	0	0	0	0
2	Van Staaden ,D (Darren)	1	0	-425	1	0	-425	0	0	0	0	0	0
2	Van Staaden ,D (Darren)	1	1427.6	1002.6	1	1400.7	1002.6	0	0	0	0	0	0
3	Galant ,M (Mervin)	1	1	425	1	1	425	0	0	0	0	0	0
3	Galant ,M (Mervin)	1	1200	1625	1	1200	1625	0	0	0	0	0	0
4	Isaacs ,Z (Zeiyaad)	1	1	425	1	1	425	0	0	0	0	0	0
4	Isaacs ,Z (Zeiyaad)	1	1102.3	1527.3	1	1072	1527.3	0	0	0	0	0	0
5	Ngombo ,P (Prince`)	1	1	425	1	1	425	0	0	0	0	0	0
5	Ngombo ,P (Prince`)	1	1446.1	1871.1	1	1398.1	1871.1	0	0	0	0	0	0
6	September ,J (Jordan)	1	1	425	1	1	425	0	0	0	0	0	0
6	September ,J (Jordan)	1	1179.1	1604.1	1	1193.2	1604.1	0	0	0	0	0	0
7	Solomon ,D (Daniel)	1	1	425	1	1	425	0	0	0	0	0	0
7	Solomon ,D (Daniel)	1	1390.7	1815.7	1	1349.5	1815.7	0	0	0	0	0	0
8	Akemdien ,A (Alex)	1	1	425	1	1	425	0	0	0	0	0	0
8	Akemdien ,A (Alex)	1	1627.1	2052.1	1	1615.1	2052.1	0	0	0	0	0	0
9	Dicks ,D (Drake)	1	0.5	0	1	0.5	0	0	0	0	0	0	0
9	Dicks ,D (Drake)	1	1468.1	1468.1	1	1478.2	1468.1	0	0	0	0	0	0
10	Simayile ,I (Isiphilinkosi)	1	1	425	1	1	425	0	0	0	0	0	0
10	Simayile ,I (Isiphilinkosi)	1	1210.3	1635.3	1	1206.4	1635.3	0	0	0	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

Ratings

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PLAYER PAGE

Personal

Koert, I (Isaac)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms